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NEET 2026 — Chemistry Questions with Answers

All 170 Chemistry previous-year questions from NEET 2026, each with the correct answer and a full explanation. Practise them as a free, timed mock test with instant scoring.

1. Q1.Organic Chemistry

   Select the reagents that reduce nitriles to primary amines: A. \((i) \ce{LiAlH4}\), \((ii) \ce{H2O}\) B. \(\ce{Sn + HCl}\) C. \(\ce{H2/Ni}\) D. \(\ce{Na[Hg]/C2H5OH}\) E. \(\ce{Br2/aq. NaOH}\) Choose the correct answer from the options given below:

   • a)B, D and E only
   • b)A, C and D only
   • c)A, D and E only
   • d)A, B and C only
2. Q2.Catalysis

   Match List I with List II: List I (Transition metal/compound/complex) A. \(\ce{V2O5}\) B. \(\ce{Fe}\) C. \(\ce{PdCl2}\) D. Ni complex List II (Catalytic Role) I. Preparation of ammonia from \(\ce{N2/H2}\) mixture II. Polymerisation of alkynes III. Preparation of \(\ce{H2SO4}\) from \(\ce{SO2}\) IV. Oxidation of ethyne to ethanal Choose the correct answer from the options given below:

   • a)A-III, B-IV, C-I, D-II
   • b)A-IV, B-I, C-III, D-II
   • c)A-II, B-I, C-IV, D-III
   • d)A-III, B-I, C-IV, D-II
3. Q3.Chemical Thermodynamics

   Consider the following reaction: \(2A\,(g) + B\,(g) \longrightarrow 2D\,(g)\) \(\Delta U^{\circ} = -10\, \text{kJ mol}^{-1}\) and \(\Delta S^{\circ} = -44\, \text{J K}^{-1}\) at 298 K. Identify the correct option with \(\Delta G^{\circ}\) for the reaction and spontaneity of the reaction at 298 K. (Given : \(R = 8.31\, \text{J mol}^{-1} \text{K}^{-1}\))

   • a)\(-1.635\, \text{kJ mol}^{-1}\), spontaneous
   • b)\(-0.63568\, \text{kJ mol}^{-1}\), spontaneous
   • c)\(+0.63568\, \text{kJ mol}^{-1}\), non-spontaneous
   • d)\(+1.635\, \text{kJ mol}^{-1}\), non-spontaneous
4. Q4.Atomic Structure

   Match List I with List II: List I (Quantum Numbers) 'n' 'l' A. 2 1 B. 4 0 C. 5 3 D. 3 2 List II (Orbital) I. 3d II. 2p III. 4s IV. 5f Choose the correct answer from the options given below:

   • a)A-IV, B-II, C-III, D-I
   • b)A-II, B-III, C-I, D-IV
   • c)A-I, B-II, C-III, D-IV
   • d)A-I, B-II, C-IV, D-I
5. Q5.Chemical Equilibrium

   In a qualitative analysis, \(\ce{Bi^{3+}}\) is detected by appearance of precipitate of \(\ce{BiO(OH)(s)}\). Calculate pH when the following equilibrium exists at 298 K : \(\ce{BiO(OH)(s) <=> BiO+ (aq) + OH- (aq)}\) \(K = 4 \times 10^{-10}\) (Given : \(\log\,2 = 0.3010\))

   • a)8.714
   • b)4.699
   • c)5.286
   • d)9.301
6. Q6.Biomolecules

   The correct statement with regard to the secondary structure of DNA/RNA is :

   • a)(1) RNA possesses a single strand helix structure and contains thymine as one of the four bases.
   • b)(2) DNA possesses a double strand helix structure and contains thymine as one of the four bases.
   • c)(3) RNA possesses a double strand helix structure and contains uracil as one of the four bases.
   • d)(4) DNA possesses a single strand helix structure and contains uracil as one of the four bases.
7. Q7.Organic Chemistry

   The pair of molecules that are metamers among the following is:

   • a)(1) \(\ce{CH3CH2CH2OH}\) and \(\ce{CH3-CH(OH)-CH3}\)
   • b)(2) \(\ce{CH3CH2CH2CH2CH3}\) and \(\ce{(CH3)2CHCH2CH3}\)
   • c)(3) \(\ce{H3C-CH2-O-CH3}\) and \(\ce{H3C-CH2-C(=O)H}\)
   • d)(4) \(\ce{CH3OCH2CH2CH3}\) and \(\ce{CH3CH2OCH2CH3}\)
8. Q8.Coordination Chemistry

   Match List I with List II: List I (Complex) A. \(\ce{[Pt(NH3)2Cl2]}\) B. \(\ce{[Co(en)3]^3+}\) C. \(\ce{[Co(NH3)5NO2]Cl2}\) D. \(\ce{[Cr(H2O)6]Cl3}\) List II (Type of isomerism) I. Optical II. Solvate III. Geometrical IV. Linkage Choose the correct answer from the options given below:

   • a)(1) A-III, B-II, C-II, D-IV
   • b)(2) A-I, B-III, C-II, D-IV
   • c)(3) A-II, B-IV, C-III, D-I
   • d)(4) A-III, B-I, C-IV, D-II
9. Q9.Chemical Kinetics

   Match List I with List II: List I (Order of reaction) A. Zero order B. First order C. Second order D. Third order List II (Unit of rate constant) I. \(\ce{mol L^{-1} s^{-1}}\) II. \(\ce{mol^{-2} L^2 s^{-1}}\) III. \(\ce{s^{-1}}\) IV. \(\ce{mol^{-1} L s^{-1}}\) Choose the correct answer from the options given below:

   • a)(1) A-IV, B-II, C-I, D-III
   • b)(2) A-IV, B-III, C-I, D-II
   • c)(3) A-IV, B-III, C-II, D-I
   • d)(4) A-I, B-II, C-III, D-IV
10. Q10.Organic Chemistry

    The correct IUPAC name of the following compound is: \(\ce{CH3-CH2-CH-CH2-CH-CH2-CH3}\) \(\quad\quad\quad|\quad\quad\quad|\) \(\quad\quad\quad\ce{CH3-CH2}\quad\quad\ce{CH3}\)

    • a)(1) 3-ethyl-5-methylheptane
    • b)(2) 2,4-diethylhexane
    • c)(3) 3-methyl-5-ethylheptane
    • d)(4) 3,5-diethylhexane
11. Q11.Energy & Photons

    A bulb is rated at \(\text{150 watt}\), converting \(\text{8%}\) energy into light. If energy of one photon is \(\text{4.42} \times \text{10}^{-19} \text{ J}\), how many photons are emitted by the bulb per second?

    • a)(1) \(\text{2.71} \times \text{10}^{19}\)
    • b)(2) \(\text{2.06} \times \text{10}^{19}\)
    • c)(3) \(\text{27.2} \times \text{10}^{19}\)
    • d)(4) \(\text{4.35} \times \text{10}^{19}\)
12. Q12.Inorganic Chemistry

    Methane reacts with steam at \(\text{1273 K}\) in the presence of nickel catalyst to form:

    • a)(1) \(\ce{CO}\) and \(\ce{H2O}\)
    • b)(2) \(\ce{CO2}\) and \(\ce{H2}\)
    • c)(3) \(\ce{CO}\) and \(\ce{H2}\)
    • d)(4) \(\ce{CO2}\) and \(\ce{H2O}\)
13. Q13.Organic Reactions

    Compound \( \text{P (C}_8\text{H}_8\text{O)} \) gives a red orange precipitate with 2,4-DNP reagent and it does not reduce Fehling's reagent. On drastic oxidation with chromic acid, P gives an aromatic product Q that produces effervescence on treating with aq. \( \text{NaHCO}_3 \). Compounds P and Q, respectively, are:

    • a)P = \( \ce{C6H5CH2CHO} \), Q = \( \ce{C6H5COOH} \)
    • b)P = \( \ce{C6H5COCH3} \), Q = \( \ce{C6H5COOH} \)
    • c)P = \( \ce{C6H5COCH3} \), Q = \( \ce{HOOC-COOH} \)
    • d)P = \( \ce{C6H5COCH3} \), Q = \( \ce{C6H5COOH} \)
14. Q14.Chemical Bonding

    Match List I with List II List I A. \( \ce{C2H4} \) B. \( \ce{C2H2} \) C. \( \ce{CH4} \) D. \( \ce{NH3} \) List II I. 3 \( \sigma \) bonds, 2 \( \pi \) bonds II. 3 \( \sigma \) bonds, one lone pair III. 4 \( \sigma \) bonds IV. 5 \( \sigma \) bonds, 1 \( \pi \) bond Choose the correct answer from the options given below:

    • a)(1) A-III, B-IV, C-II, D-I
    • b)(2) A-IV, B-I, C-III, D-II
    • c)(3) A-I, B-II, C-IV, D-III
    • d)(4) A-II, B-III, C-I, D-IV
15. Q15.Organic Reactions

    The following two reactions give the same foul smelling product Z. \( \ce{C2H5Cl ->[X] Z} \) \( \ce{C2H5NH2 ->[Br2, NaOH][\Delta, ethanolic KOH] Z} \) X and Z, respectively, are :

    • a)(1) \( \ce{X = AgCN} \); \( \ce{Z = C2H5NC} \)
    • b)(2) \( \ce{X = KCN} \); \( \ce{Z = C2H5CN} \)
    • c)(3) \( \ce{X = AgCN} \); \( \ce{Z = C2H5CN} \)
    • d)(4) \( \ce{X = KCN} \); \( \ce{Z = C2H5NC} \)
16. Q16.Mole Concept

    The number of hydrogen atoms present in 5.4 g of urea is : (Given : Molar mass of urea = \( \text{60 g mol}^{-1} \), \( \text{N}_{\text{A}} \) : \( \text{6.022} \times \text{10}^{23} \) particles \( \text{mol}^{-1} \))

    • a)(1) \( \text{1.084} \times \text{10}^{23} \)
    • b)(2) \( \text{1.084} \times \text{10}^{22} \)
    • c)(3) \( \text{2.168} \times \text{10}^{22} \)
    • d)(4) \( \text{2.168} \times \text{10}^{23} \)
17. Q17.P-block Elements

    Identify the \( \underline{\text{incorrect}} \) statement from the following :

    • a)(1) Nitrogen can form \( \text{p}\pi\text{-p}\pi \) multiple bonds with itself.
    • b)(2) \( \text{P(C}_2\text{H}_5)_3 \) and \( \text{As(C}_6\text{H}_5)_3 \) form \( \text{d}\pi\text{-d}\pi \) bond with transition metals.
    • c)(3) Phosphorus, arsenic and antimony show catenation property.
    • d)(4) Nitrogen can form \( \text{d}\pi\text{-p}\pi \) bond with oxygen.
18. Q18.Coordination Compounds

    Which one of the following is an \( \underline{\text{ambidentate}} \) ligand ?

    • a)(1) Ethane-1,2-diamine
    • b)(2) Ethylenediaminetetraacetate ion
    • c)(3) Thiocyanate
    • d)(4) Oxalate
19. Q19.Periodic Properties

    The correct order of increasing metallic character of Na, Be, P, Mg and Si is :

    • a)\(\ce{P < Si < Be < Mg < Na}\)
    • b)\(\ce{P < Si < Na < Mg < Be}\)
    • c)\(\ce{P < Mg < Be < Si < Na}\)
    • d)\(\ce{Be < Si < P < Mg < Na}\)
20. Q20.Organic Reactions

    Match List I with List II : List I A. \(\ce{C6H5-CH(CH3)2 -> C6H5OH}\) B. \(\ce{CH3COOH -> CH3CH2OH}\) C. \(\ce{CH3CH2CH2OH -> CH3-CH=CH2}\) D. \(\ce{C6H5OH -> C6H5O^{-}Na^{+}}\) List II I. Clemmensen reduction II. \((i)\) \(\ce{NaOH}\), \(\Delta\) \((ii)\) \(\ce{H+}\) III. \((i)\) \(\ce{O2}\) \((ii)\) \(\ce{H+/H2O}\) IV. \((i)\) conc. \(\ce{H2SO4}\), \(\Delta\) \((ii)\) \(\ce{H+/H2O}\) Choose the correct answer from the options given below :

    • a)A-II, B-III, C-I, D-IV
    • b)A-II, B-III, C-IV, D-I
    • c)A-II, B-IV, C-III, D-I
    • d)A-I, B-III, C-IV, D-II
21. Q21.D & F-Block

    Although +3 oxidation state is most common in lanthanoids, cerium still shows +4 oxidation state because :

    • a)After losing one more electron, it acquires \(\ce{4f^{14}}\) electronic configuration.
    • b)Its nearest inert gas is Radon.
    • c)Its atomic number is 61.
    • d)After losing one more electron, it acquires \(\ce{4f^{0}}\) electronic configuration.
22. Q22.Organic Reaction Sequence

    In the following reaction sequence, X and Z, respectively are : \(\ce{CH3CH2CH2-OH + PCl5 -> CH3CH2CH2Cl + HCl + X}\) \(\ce{CH3CH2CH2Cl}\) \(\xrightarrow{\text{alc. KOH, \Delta}}\) \(\ce{Y}\) \(\ce{Y}\) \(\xrightarrow{\text{HBr / (C6H5CO)2O2}}\) \(\ce{Z}\)

    • a)\(\ce{X = POCl3}\); \(\ce{Z = CH3-CH-CH3}\) \(\quad\) \(\quad\) \(\quad\) \(\quad\) \(\quad\) \(\quad\) \(\ce{|}\) \(\quad\) \(\quad\) \(\quad\) \(\quad\) \(\quad\) \(\quad\) \(\ce{Br}\)
    • b)\(\ce{X = POCl3}\); \(\ce{Z = CH3CH2CH2-Br}\)
    • c)\(\ce{X = H3PO3}\); \(\ce{Z = CH3-CH-CH3}\) \(\quad\) \(\quad\) \(\quad\) \(\quad\) \(\quad\) \(\quad\) \(\ce{|}\) \(\quad\) \(\quad\) \(\quad\) \(\quad\) \(\quad\) \(\quad\) \(\ce{Br}\)
    • d)\(\ce{X = H3PO3}\); \(\ce{Z = CH3CH2CH2-Br}\)
23. Q23.Coordination Compounds

    Match List I with List II : List I (Complex/ion) A. \(\ce{[Pt(Cl)2(NH3)2]}\) B. \(\ce{[Co(NH3)6]Cl3}\) C. \(\ce{[NiCl4]^{2-}}\) D. \(\ce{[Fe(CO)5]}\) List II (Shape/geometry) I. Octahedral II. Trigonal bipyramidal III. Square planar IV. Tetrahedral Choose the correct answer from the options given below :

    • a)A-III, B-IV, C-I, D-II
    • b)A-III, B-I, C-IV, D-II
    • c)A-IV, B-I, C-III, D-II
    • d)A-IV, B-III, C-IV, D-II
24. Q24.Organic Chemistry

    The functional group that can be identified through phthalein dye test is :

    • a)Aldehyde
    • b)Phenolic
    • c)Carboxylic acid
    • d)Alcohol
25. Q25.Organic Chemistry

    Two products X and Y are formed in the following reaction sequence. \( \ce{CH3Cl + Anhydr. AlCl3 ->} \) W \( \ce{+ dil. HNO3 / dil. H2SO4, warm -> X + Y} \) The suitable method that can be used for the separation of products X and Y is:

    • a)Fractional distillation
    • b)Sublimation
    • c)Differential extraction
    • d)Continuous extraction
26. Q26.Solutions Chemistry

    Identify the correct statements: A. The molality of 2.5 g of ethanoic acid (Molar mass : \( \text{60 g mol}^{-1} \)) in 75 g of benzene solution is 0.556 m. B. The molarity of a solution containing 5 g of NaOH (molar mass: \( \text{40 g mol}^{-1} \)) in 450 mL of solution is 0.278 M at 298 K. C. Aquatic species are more comfortable in cold water. D. The solubility of gas increases with decrease in pressure. E. For a binary mixture of A and B, the number of moles of A and B are \( n_A \) and \( n_B \) respectively. The mole fraction of B will be \( \chi_B = \frac{n_A}{n_A + n_B} \) Choose the correct answer from the options given below:

    • a)A, B and C only
    • b)A and B only
    • c)A and C only
    • d)A, D and E only
27. Q27.Organic Chemistry

    During Lassaigne's test, the elements present in an organic compound are converted from :

    • a)ionic form to ionic form
    • b)covalent form to ionic form
    • c)covalent form to covalent form
    • d)ionic form to covalent form
28. Q28.Electrochemistry

    A solution of copper sulphate is electrolysed for 10 minutes with a current of 1.5 amperes. The mass of copper deposited at cathode is : (Given : Molar mass of \( \text{Cu = 63 g mol}^{-1} \); \( \text{1 F = 96487 C mol}^{-1} \))

    • a)1-7018 g
    • b)0-2938 g
    • c)2-4036 g
    • d)0-5876 g
29. Q29.Chemical Thermodynamics

    At a certain temperature, T (K), during a process, 500 J is absorbed by the system and work of 200 J is done by the system. Then change in internal energy of the system is :

    • a)400 J
    • b)300 J
    • c)700 J
    • d)500 J
30. Q30.Chemical Kinetics

    For a certain reaction R \( \longrightarrow \) Product, the plot of concentration [R] vs time has a negative slope as shown. The order of reaction is :

    • a)0
    • b)1
    • c)2
    • d)2.5
31. Q31.Chemical Bonding

    Identify the correct statement about \(\ce{ClF3}\) from the following options:

    • a)It has T-shaped geometry with two lone pairs on \(\ce{Cl}\) atom.
    • b)It has T-shaped geometry with three lone pairs on \(\ce{Cl}\) atom.
    • c)It has a trigonal pyramidal geometry with two lone pairs on \(\ce{Cl}\) atom.
    • d)It has a planar trigonal geometry with two lone pairs on \(\ce{Cl}\) atom.
32. Q32.Qualitative Analysis

    In a test tube containing a salt, a few drops of dilute \(\ce{H2SO4}\) was added, which gave colourless vapours having the smell of vinegar. The vapours turned the blue litmus paper red. Identify the correct anion from the following :

    • a)Sulphide, \(\ce{S^2-}\)
    • b)Sulphate, \(\ce{SO4^2-}\)
    • c)Acetate, \(\ce{CH3COO-}\)
    • d)Carbonate, \(\ce{CO3^2-}\)
33. Q33.Chemical Equilibrium

    At \(298 \text{ K}\), a certain buffer solution contains equal concentrations of \(\ce{X^-}\) and \(\ce{HX}\). \(\ce{K_b}\) for \(\ce{X^-}\) is \(10^{-10}\). What is the \(\text{pH}\) of this buffer solution ?

    • a)2
    • b)4
    • c)6
    • d)10
34. Q34.Electrochemistry

    Calculate \(\text{emf}\) of the half cell given below: \(\ce{Pt (s) | H2 (g, 2 atm) | HCl (aq, 0.02 M)}\) \(\text{E}^0_{\ce{H+ | H2}} = 0 \text{ V}\) \(\text{(Given: } \frac{2.303 \text{ RT}}{\text{F}} = 0.050\), \(\log 2 = 0.3010\))

    • a)\(-0.109 \text{ V}\)
    • b)\(0.035 \text{ V}\)
    • c)\(-0.035 \text{ V}\)
    • d)\(0.109 \text{ V}\)
35. Q35.Coordination Compounds

    The calculated 'spin-only' magnetic moment of \(\ce{Ti^2+} (3d^2)\) is:

    • a)5.92 BM
    • b)2.84 BM
    • c)3.87 BM
    • d)4.90 BM
36. Q36.Inorganic Chemistry

    Identify the incorrect statement from the following:

    • a)Carbon has the ability to form \(\text{p}\pi-\text{p}\pi\) multiple bond with itself.
    • b)\(\ce{ECl3}\) (\(\ce{E = B}\) and \(\ce{Al}\)) is a monomer when \(\ce{E = B}\) and a dimer when \(\ce{E = Al}\).
    • c)The order of catenation property of Group 14 elements is \(\ce{C >> Si > Ge = Sn}\).
    • d)Oxygen exhibits only \(-2\) oxidation state.
37. Q37.Chemical Bonding

    The correct formal charges on oxygen atoms numbered 2, 1 and 3 respectively are:

    • a)\(-1, 0, +1\)
    • b)0, +1, \(-1\)
    • c)0, 0, 0
    • d)\(-1, 0, -1\)
38. Q38.Analytical Chemistry

    Phenolphthalein is used as an indicator for the titration of sodium hydroxide solution against a standard solution of oxalic acid. The colour change that is observed at an alkaline \(\text{pH}\) close to the equivalence point during this titration is:

    • a)pinkish red to yellow
    • b)yellow to pinkish red
    • c)pink to colourless
    • d)colourless to pink
39. Q39.Chemical Reactions

    When 1 dm³ of \(\ce{CO_2}\) gas is passed over hot coke, the volume of gaseous mixture after complete reaction at STP becomes 1⋅4 dm³. The composition of the gaseous mixture at STP is:

    • a)0⋅8 dm³ of \(\ce{CO}\), 0⋅6 dm³ of \(\ce{CO_2}\)
    • b)0⋅8 dm³ of \(\ce{CO}\), 0⋅6 dm³ of \(\ce{CO_2}\)
    • c)0⋅6 dm³ of \(\ce{CO}\), 0⋅8 dm³ of \(\ce{CO_2}\)
    • d)0⋅6 dm³ of \(\ce{CO}\), 0⋅4 dm³ of \(\ce{CO_2}\)
40. Q40.Organic Chemistry

    The major product Z formed in the following sequence of reactions is:

    • a)\(\ce{C_2H_3NO_2}\)
    • b)\(\ce{C_2H_5-N = N-OH}\)
    • c)\(\ce{C_2H_5OH}\)
    • d)\(\ce{C_2H_5NH_2}\)
41. Q41.Chemical Kinetics

    Given below is an expression for the rate constant of a first order reaction occurring at a certain temperature, T (K). \(\ln k = 14 \text{⋅} 34 - \frac{1 \text{⋅} 25 \times 10^4}{T}\) The energy of activation in \(\text{kcal mol}^{-1}\) for the reaction is: (Given : k in \(\text{s}^{-1}\), \(\text{R} = 1 \text{⋅} 987 \text{ cal mol}^{-1} \text{K}^{-1}\))

    • a)24.84
    • b)14.34
    • c)18.63
    • d)12.42
42. Q42.Chemical Equilibrium

    Given below are certain reactions. Identify the reaction for which \(\text{K}_P = \text{K}_C\).

    • a)\(\ce{H_2O (g) + CO (g) <=> H_2 (g) + CO_2 (g)}\)
    • b)\(\ce{N_2 (g) + 3H_2 (g) <=> 2NH_3 (g)}\)
    • c)\(\ce{H_2 (g) + I_2 (g) <=> 2HI (g)}\)
    • d)\(\ce{N_2 (g) + O_2 (g) <=> 2NO (g)}\)
43. Q43.Inorganic Chemistry

    Identify the incorrect statement from the following:

    • a)The largest and the smallest species among \(\ce{Mg}\), \(\ce{Mg^{2+}}\), \(\ce{Al}\) and \(\ce{Al^{3+}}\) are \(\ce{Al}\) and \(\ce{Mg^{2+}}\) respectively.
    • b)The IUPAC name of the element with atomic number 107 is Unnilseptium.
    • c)The similarity in behaviour of \(\ce{Li}\) with \(\ce{Mg}\) is referred to as "diagonal relationship".
    • d)The oxidation state and covalency of \(\ce{Al}\) in \(\ce{[AlCl(H2O)5]^{2+}}\) are 3 and 6 respectively.
44. Q44.Solutions Properties

    Mixture of chloroform and acetone forms a solution with negative deviation from Raoult's law due to:

    • a)increase in escaping tendency of molecules of each component.
    • b)formation of hydrogen bonding between acetone and chloroform.
    • c)stronger intermolecular forces between chloroform molecules than those between chloroform and acetone molecules.
    • d)repulsive forces.
45. Q45.Organic Reactions

    The number of chlorine atoms present in the organic products X and Y of the following reactions, respectively, are:

    • a)3 and 3
    • b)6 and 3
    • c)6 and 6
    • d)3 and 6
46. Q46.Atomic Structure

    Match List I with List II : List I (Quantum Numbers) List II (Orbital) A. \(n=2, l=1\) I. 3d B. \(n=4, l=0\) II. 2p C. \(n=5, l=3\) III. 4s D. \(n=3, l=2\) IV. 5f Choose the correct answer from the options given below :

    • a)(1) A-II, B-III, C-I, D-IV
    • b)(2) A-II, B-III, C-IV, D-I
    • c)(3) A-IV, B-II, C-III, D-I
    • d)(4) A-I, B-II, C-III, D-IV
47. Q47.Organic Chemistry

    During Lassaigne's test, the elements present in an organic compound are converted from :

    • a)(1) covalent form to ionic form
    • b)(2) covalent form to covalent form
    • c)(3) ionic form to ionic form
    • d)(4) ionic form to covalent form
48. Q48.Organic Reactions

    The number of chlorine atoms present in the organic products X and Y of the following reactions, respectively, are :

    • a)(1) 3 and 6
    • b)(2) 6 and 3
    • c)(3) 3 and 3
    • d)(4) 6 and 6
49. Q49.Organic Chemistry

    Two products X and Y are formed in the following reaction sequence. \(\ce{C6H6} + \ce{CH3Cl} \xrightarrow{ ext{Anhydr. }\ce{AlCl3}} W \xrightarrow{ ext{dil. } \ce{HNO3} + ext{dil. } \ce{H2SO4}, ext{ warm}} X + Y\) The suitable method that can be used for the separation of products X and Y is :

    • a)(1) Sublimation
    • b)(2) Differential extraction
    • c)(3) Continuous extraction
    • d)(4) Fractional distillation
50. Q50.Chemical Bonding

    Identify the correct statement about \(\ce{ClF3}\) from the following options :

    • a)(1) It has T-shaped geometry with three lone pairs on \(\ce{Cl}\) atom.
    • b)(2) It has a planar trigonal geometry with two lone pairs on \(\ce{Cl}\) atom.
    • c)(3) It has T-shaped geometry with two lone pairs on \(\ce{Cl}\) atom.
    • d)(4) It has a trigonal pyramidal geometry with two lone pairs on \(\ce{Cl}\) atom.
51. Q51.Organic Chemistry

    The functional group that can be identified through phthalein dye test is:

    • a)Alcohol
    • b)Aldehyde
    • c)Phenolic
    • d)Carboxylic acid
52. Q52.Electrochemistry

    A solution of copper sulphate is electrolysed for 10 minutes with a current of 1.5 amperes. The mass of copper deposited at cathode is : (Given : Molar mass of \(\\ce{Cu} = 63 \text{ g mol}^{-1}\), \(1 \text{ F} = 96487 \text{ C mol}^{-1}\))

    • a)0.2938 g
    • b)1.7018 g
    • c)2.4036 g
    • d)0.5876 g
53. Q53.Inorganic Chemistry

    Match List I with List II : List I (Transition metal/ compound/ complex) A. \(\\ce{V2O5}\) B. \(\\ce{Fe}\) C. \(\\ce{PdCl2}\) D. Ni complex List II (Catalytic Role) I. Preparation of ammonia from \(\\ce{N2/H2}\) mixture II. Polymerisation of alkynes III. Preparation of \(\\ce{H2SO4}\) from \(\\ce{SO2}\) IV. Oxidation of ethyne to ethanal Choose the correct answer from the options given below :

    • a)A-III, B-I, C-IV, D-II
    • b)A-III, B-IV, C-I, D-II
    • c)A-IV, B-I, C-III, D-II
    • d)A-II, B-I, C-IV, D-III
54. Q54.Coordination Chemistry

    Match List I with List II : List I (Complex/ion) A. \(\\ce{[Pt(Cl)2(NH3)2]}\) B. \(\\ce{[Co(NH3)6]Cl3}\) C. \(\\ce{[NiCl4]^{2-}}\) D. \(\\ce{[Fe(CO)5]}\) List II (Shape/geometry) I. Octahedral II. Trigonal bipyramidal III. Square planar IV. Tetrahedral Choose the correct answer from the options given below :

    • a)A-IV, B-I, C-III, D-II
    • b)A-III, B-I, C-IV, D-II
    • c)A-I, B-III, C-IV, D-II
    • d)A-III, B-IV, C-I, D-II
55. Q55.General Chemistry

    Identify the incorrect statement from the following :

    • a)The IUPAC name of the element with atomic number 107 is Unnilseptium.
    • b)The oxidation state and covalency of Al in \(\\ce{[AlCl(H2O)5]^2+}\) are 3 and 6 respectively.
    • c)The largest and the smallest species among \(\\ce{Mg, Mg^2+, Al, Al^3+}\) are \(\\ce{Al}\) and \(\\ce{Mg^2+}\) respectively.
    • d)The similarity in behaviour of Li with Mg is referred to as 'diagonal relationship'.
56. Q56.Chemical Kinetics

    Given below is an expression for the rate constant of a first order reaction occurring at a certain temperature, T (K). \(\ln k = 14.34 - \frac{1.25 \times 10^4}{T}\) The energy of activation in kcal mol\(^{-1}\) for the reaction is : (Given : k in \(\text{s}^{-1}\), R = 1.987 cal mol\(^{-1}\) K\(^{-1}\))

    • a)14.34
    • b)18.63
    • c)24.84
    • d)12.42
57. Q57.Acid-Base Titration

    Phenolphthalein is used as an indicator for the titration of sodium hydroxide solution against a standard solution of oxalic acid. The colour change that is observed at an alkaline pH close to the equivalence point during this titration is:

    • a)colourless to pink
    • b)pinkish red to yellow
    • c)pink to colourless
    • d)yellow to pinkish
58. Q58.Chemical Reactions

    Methane reacts with steam at 1273 K in the presence of nickel catalyst to form:

    • a)\ce{CO} and \ce{H2}
    • b)\ce{CO2} and \ce{H2}
    • c)\ce{CO} and \ce{H2O}
    • d)\ce{CO2} and \ce{H2O}
59. Q59.Organic Chemistry

    Match List I with List II: List I A. \ce{H3C-CH(OH)-CH3 -> } [Product missing from image] B. \ce{CH3COOH -> CH3CH2OH} C. \ce{CH3CH2CH2OH -> } [Product missing from image] D. \ce{C6H6 -> C6H5OH} List II I. (i) NaOH, \(\Delta\), (ii) \ce{H^+} II. (i) \ce{O2}, (ii) \ce{H3O^+} III. (i) \ce{CH3OH}, \ce{H^+}, (ii) \ce{H2} catalyst IV. (i) conc. \ce{H2SO4}, \(\Delta\), (ii) \ce{H^+/H2O} Choose the correct answer from the options given below:

    • a)A-I, B-III, C-IV, D-II
    • b)A-II, B-III, C-I, D-IV
    • c)A-II, B-III, C-II, D-I
    • d)A-II, B-IV, C-III, D-I
60. Q60.Organic Chemistry

    The pair of molecules that are metamers among the following is:

    • a)\ce{CH3OCH2CH2CH3} and \ce{CH3CH2OCH2CH3}
    • b)\ce{CH3CH2CH2CH3} and \ce{(CH3)2CHCH3}
    • c)\ce{H3C-C(=O)-CH3} and \ce{H3C-CH2-C(=O)-H}
    • d)\ce{CH3CH2CH2OH} and \ce{CH3-CH(OH)-CH3}
61. Q61.Coordination Chemistry

    Match List I with List II: List I (Complex) A. \ce{[Pt(NH3)2Cl2]} B. \ce{[Co(en)3]^3+} C. \ce{[Co(NH3)5NO2]Cl2} D. \ce{[Cr(H2O)6]Cl3} List II (Type of isomerism) I. Optical II. Solvate III. Geometrical IV. Linkage Choose the correct answer from the options given below:

    • a)A-II, B-IV, C-III, D-I
    • b)A-III, B-I, C-II, D-IV
    • c)A-I, B-III, C-II, D-IV
    • d)A-III, B-I, C-IV, D-II
62. Q62.Stoichiometry

    The number of hydrogen atoms present in \(5.4 \text{ g}\) of urea is: (Given : Molar mass of urea : \(60 \text{ g mol}^{-1}\), \(\text{N_A} : 6.022 \times 10^{23} \text{ particles mol}^{-1}\))

    • a)\(2.168 \times 10^{22}\)
    • b)\(2.168 \times 10^{23}\)
    • c)\(1.084 \times 10^{22}\)
    • d)\(1.084 \times 10^{23}\)
63. Q63.Inorganic Chemistry

    The calculated 'spin-only' magnetic moment of \(\ce{Ti^{2+}} \ (3d^2)\) is:

    • a)\(3.87 \text{ BM}\)
    • b)\(5.92 \text{ BM}\)
    • c)\(4.90 \text{ BM}\)
    • d)\(2.84 \text{ BM}\)
64. Q64.

    For a certain reaction \(\ce{R o Product}\), the plot of concentration \([\ce{R}]\) vs time has a negative slope as shown. The order of reaction is:

    • a)1
    • b)2
    • c)2.5
    • d)0
65. Q65.

    Compound \(\ce{P (C8H8O)}\) gives a red orange precipitate with 2,4-DNP reagent and it does not reduce Fehling's reagent. On drastic oxidation with chromic acid, \(\ce{P}\) gives an aromatic product \(\ce{Q}\) that produces effervescence on treating with aq. \(\ce{NaHCO3}\). Compounds \(\ce{P}\) and \(\ce{Q}\), respectively, are:

    • a)P = ⏒⎯⏒⎯⏒-C(=O)-CH3; Q = ⏒⎯⏒⎯⏒-C(=O)OH (with an -OH group ortho/meta to -COOH on the ring)
    • b)P = ⏒⎯⏒⎯⏒-C(=O)-CH3; Q = ⏒⎯⏒⎯⏒-COOH
    • c)P = H3C-⏒⎯⏒⎯⏒-CHO; Q = HOOC-⏒⎯⏒⎯⏒-COOH
    • d)P = H3C-⏒⎯⏒⎯⏒-CHO; Q = H3C-⏒⎯⏒⎯⏒-OH
66. Q66.

    Match List I with List II: List I (Order of reaction) A. Zero order B. First order C. Second order D. Third order List II (Unit of rate constant) I. \(\ce{mol^{-1} L s^{-1}}\) II. \(\ce{mol^{-2} L^{2} s^{-1}}\) III. \(\ce{s^{-1}}\) IV. \(\ce{mol L^{-1} s^{-1}}\) Choose the correct answer from the options given below:

    • a)A-IV, B-III, C-II, D-I
    • b)A-IV, B-III, C-I, D-II
    • c)A-IV, B-II, C-I, D-III
    • d)A-I, B-II, C-III, D-IV
67. Q67.

    Although \(\ce{+3}\) oxidation state is most common in lanthanoids, cerium still shows \(\ce{+4}\) oxidation state because:

    • a)After losing one more electron, it acquires \(\ce{4f^{14}}\) electronic configuration.
    • b)Its atomic number is 61.
    • c)After losing one more electron, it acquires \(\ce{4f^0}\) electronic configuration.
    • d)Its nearest inert gas is Radon.
68. Q68.

    In a test tube containing a salt, a few drops of dilute \(\ce{H2SO4}\) was added, which gave colourless vapours having the smell of vinegar. The vapours turned the blue litmus paper red. Identify the correct anion from the following:

    • a)Carbonate, \(\ce{CO3^{2-}}\)
    • b)Sulphate, \(\ce{SO4^{2-}}\)
    • c)Acetate, \(\ce{CH3COO^{-}}\)
    • d)Sulphide, \(\ce{S^{2-}}\)
69. Q69.

    Calculate emf of the half cell given below \(\ce{Pt(s) | H2 (g, 2 atm) | HCl (aq, 0.02 M)}\) \(\ce{E^{\circ}_{H+/H2} = 0 V}\) (Given: \(\frac{2.303 \text{ RT}}{\text{F}} = 0.059\), \(\log 2 = 0.3010\))

    • a)0.035 V
    • b)-0.035 V
    • c)-0.109 V
    • d)0.109 V
70. Q70.

    At 298 K, a certain buffer solution contains equal concentrations of \(\ce{X^-}\) and \(\ce{HX}\). \(\ce{K_b}\) for \(\ce{X^-}\) is \(10^{-10}\). What is the pH of this buffer solution ?

    • a)4
    • b)6
    • c)2
    • d)10
71. Q71.Organic Nomenclature

    The correct IUPAC name of the following compound is : \(\ce{CH3-CH2-CH-CH2-CH-CH2-CH3}\) \(\phantom{\text{CH3-CH2-CH}|_{\text{CH3-CH2}}\text{CH-CH2-CH3}}\) \(\phantom{\text{CH3-CH2-CH-CH2-CH}|_{\text{CH3}}}\)

    • a)3-methyl-5-ethylheptane
    • b)3-ethyl-5-methylheptane
    • c)3,5-diethylhexane
    • d)2,4-diethylhexane
72. Q72.Organic Reactions

    The following two reactions give the same foul smelling product Z. Reaction 1: \(\ce{C2H5Cl ->[X] Z}\) Reaction 2: \(\ce{C2H5CONH2 ->[(i) Br2, NaOH][(ii) CHCl3/ethanolic KOH, \Delta] Z}\) X and Z respectively, are:

    • a)\(\ce{X = AgCN}\); \(\ce{Z = C2H5CN}\)
    • b)\(\ce{X = KCN}\); \(\ce{Z = C2H5CN}\)
    • c)\(\ce{X = KCN}\); \(\ce{Z = C2H5NC}\)
    • d)\(\ce{X = AgCN}\); \(\ce{Z = C2H5NC}\)
73. Q73.Solutions Chemistry

    Mixture of chloroform and acetone forms solution with negative deviation from Raoult's law due to:

    • a)increase in escaping tendency of molecules of each component.
    • b)repulsive forces.
    • c)stronger intermolecular forces between chloroform molecules than those between chloroform and acetone molecules.
    • d)formation of hydrogen bonding between acetone and chloroform.
74. Q74.Solutions & Properties

    Identify the correct statements: A. The molality of 2.5 g ethanoic acid (molar mass: 60 g/mol) in 75 g of benzene solution is 0.55 m. B. The molarity of a solution made by dissolving 4 g of NaOH (molar mass: 40 g/mol) in water to make 250 mL of solution is 0.274 M. C. Aquatic species are more comfortable in cold water. D. The solubility of gases in liquids increases with increase in pressure. E. For a binary solution of two volatile liquids A and B, the mole fraction of component B in vapour phase \(x_B = \frac{n_A}{n_A + n_B}\) Choose the correct option below:

    • a)A and B only
    • b)A, D and E only
    • c)A, B and C only
    • d)A and C only
75. Q75.Inorganic Chemistry

    Identify the incorrect statement from the following:

    • a)\ce{ECl3} (\ce{E} = \ce{B} and \ce{Al}) is a monomer when \ce{E} = \ce{B} and a dimer when \ce{E} = \ce{Al}.
    • b)The order of catenation property of Group 14 elements \ce{C} \gg \ce{Si} > \ce{Ge} = \ce{Sn}.
    • c)Oxygen exhibits only -2 oxidation state.
    • d)Carbon has the ability to form \(\pi\)-\(\pi\) multiple bond with itself.
76. Q76.Chemical Bonding

    The correct formal charges on oxygen atoms numbered 2, 1 and 3 respectively are:

    • a)\(-1, 0, +1\)
    • b)\(0, 0, 0\)
    • c)\(0, +1, -1\)
    • d)\(+1, 0, -1\)
77. Q77.Chemical Thermodynamics

    At a certain temperature, \(T\) (K), during a process, 500 J is absorbed by the system and work of 200 J is done by the system. Then change in internal energy of the system is:

    • a)500 J
    • b)400 J
    • c)300 J
    • d)700 J
78. Q78.Chemical Thermodynamics

    Consider the following reaction: \(\ce{2A(g) + B(g) \to 2D(g)}\) \(\Delta U^\ominus = -10 \text{ kJ mol}^{-1}\) and \(\Delta S^\ominus = -44 \text{ J K}^{-1}\) at 298 K. Identify the correct option with \(\Delta G^\ominus\) for the reaction and spontaneity of the reaction at 298 K. (Given : \(R = 8.31 \text{ J mol}^{-1} \text{K}^{-1}\))

    • a)\(-0.63568 \text{ kJ mol}^{-1}\), spontaneous
    • b)\(+0.63568 \text{ kJ mol}^{-1}\), non-spontaneous
    • c)\(-1.635 \text{ kJ mol}^{-1}\), spontaneous
    • d)\(+1.635 \text{ kJ mol}^{-1}\), non-spontaneous
79. Q79.Organic Chemistry

    Select the reagents that reduce nitriles to primary amines: A. (i) \ce{LiAlH4}; (ii) \ce{H2O} B. \ce{Sn + HCl} C. \ce{H2/Ni} D. \ce{Na(Hg)/C2H5OH} E. \ce{Br2/aq. NaOH} Choose the correct answer from the options given below:

    • a)A, C and D only
    • b)A, B and C only
    • c)B, D and E only
    • d)A, D and E only
80. Q80.Inorganic Chemistry

    Which one of the following is an ambident ligand?

    • a)Oxalate
    • b)Ethylenediaminetetraacetate ion
    • c)Thiocyanate
    • d)Ethane-1,2-diamine
81. Q81.Inorganic Chemistry

    Identify the incorrect statement from following:

    • a)Nitrogen can form \(\pi\)-\(\pi\) multiple bonds itself.
    • b)\ce{P(C2H5)3} and \ce{As(C6H5)3} form \(d\pi\)-\(\pi\) with transition metals.
    • c)Nitrogen can form \(d\pi\)-\(p\pi\) bond with oxygen.
    • d)Phosphorus, arsenic and antimony show catenation property.
82. Q82.Inorganic Chemistry

    The correct order of increasing metallic character of Na, Be, P, Mg and Si is:

    • a)P < Si < Be < Mg < Na
    • b)Be < Si < P < Mg < Na
    • c)P < Si < Na < Mg < Be
    • d)P < Mg < Be < Si < Na
83. Q83.Physical Chemistry

    In a qualitative analysis, \(\\ce{Bi^{3+}}\\) is detected by appearance of precipitate of \(\\ce{BiO(OH)(s)}\\). Calculate pH when the following equilibrium exists at 298 K: \(\\ce{BiO(OH)(s) <=> Bi^{+}(aq) + OH^{-}(aq)}\\), \(K = 4 \times 10^{-10}\\) (Given : log 2 = 0.3010)

    • a)4.699
    • b)9.301
    • c)5.286
    • d)8.714
84. Q84.Physical Chemistry

    Match List I with List II **List I** A. \(\\ce{C2H4}\\) B. \(\\ce{C2H2}\\) C. \(\\ce{CH4}\\) D. \(\\ce{NH3}\\) **List II** I. 3 \(\sigma\) bonds, 2 \(\pi\) bonds II. 3 \(\sigma\) bonds, one lone pair III. 4 \(\sigma\) bonds IV. 5 \(\sigma\) bonds, 1 \(\pi\) bond Choose the correct answer from the options given below:

    • a)A-I, B-II, C-IV, D-III
    • b)A-II, B-III, C-I, D-IV
    • c)A-III, B-IV, C-II, D-I
    • d)A-IV, B-I, C-III, D-II
85. Q85.Chemical Equilibrium

    Given below are certain reactions. Identify the reaction for which \(K_{\text{p}} = K_{\text{c}}\\).

    • a)\(\\ce{N2(g) + O2(g) <=> 2NO(g)}\\)
    • b)\(\\ce{H2O(g) + CO(g) <=> H2(g) + CO2(g)}\\)
    • c)\(\\ce{H2(g) + I2(g) <=> 2HI(g)}\\)
    • d)\(\\ce{N2(g) + 3H2(g) <=> 2NH3(g)}\\)
86. Q86.Organic Reactions

    In the following reaction sequence, X and Z, respectively are: \(\\ce{CH3CH2CH2-OH + PCl5 -> CH3CH2CH2Cl + X + HCl}\\) \(\\ce{CH3CH2CH2Cl ->[alc. KOH][\\Delta] Y ->[HBr][(C6H5CO2)2] Z}\\)

    • a)\(X = H_3PO_3\); \(Z = CH_3\text{-}CH(Br)\text{-}CH_3\)
    • b)\(X = POCl_3\); \(Z = CH_3\text{-}CH(Br)\text{-}CH_3\)
    • c)\(X = H_3PO_3\); \(Z = CH_3CH_2CH_2\text{-}Br\)
    • d)\(X = POCl_3\); \(Z = CH_3CH_2CH_2\text{-}Br\)
87. Q87.Organic Reactions

    The major product Z formed in the following sequence of reactions is: \(\\ce{C2H6 ->[Cl2][UV light] X (monochlorinated product) ->[NH3] Y ->[(i) NaNO2, HCl][(ii) H2O] Z}\\)

    • a)\(\\ce{C2H5NO2}\\)
    • b)\(\\ce{C2H5-N=N-OH}\\)
    • c)\(\\ce{C2H5NH2}\\)
    • d)\(\\ce{C2H5OH}\\)
88. Q88.Chemical Stoichiometry

    When \(1 \text{ dm}^3\) of \(\\ce{CO2}\\) gas is passed over hot coke, the volume of gaseous mixture after complete reaction at STP becomes \(1.4 \text{ dm}^3\\). The composition of the gaseous mixture at STP is:

    • a)\(0.6 \text{ dm}^3\) of \(\\ce{CO}\\), \(0.8 \text{ dm}^3\) of \(\\ce{CO2}\\)
    • b)\(0.6 \text{ dm}^3\) of \(\\ce{CO}\\), \(0.4 \text{ dm}^3\) of \(\\ce{CO2}\\)
    • c)\(0.8 \text{ dm}^3\) of \(\\ce{CO}\\), \(0.8 \text{ dm}^3\) of \(\\ce{CO2}\\)
    • d)\(0.8 \text{ dm}^3\) of \(\\ce{CO}\\), \(0.6 \text{ dm}^3\) of \(\\ce{CO2}\\)
89. Q89.Organic chemistry reactions

    For the following reaction sequence, choose the correct option

    • a)(1) If P is the sodium salt of a carboxylic acid, Q is a primary alcohol.
    • b)(2) P and Q are aromatic compounds.
    • c)(3) If P gives a carboxylic acid on acidification, Q gives a poisonous gas on exposure to air and light.
    • d)(4) Both P and Q are carbonyl compounds.
90. Q90.Coordination compounds

    Given below are two statements: Statement-I : \(\ce{[Fe(ox)3]^3-}\) is chiral. Statement-II : extit{trans}-\(\ce{[Cr(H2O)2(ox)2]-}\) is chiral. In the light of the above statements, choose the most appropriate answer from the options given below:

    • a)(1) Both Statement-I and Statement-II are correct.
    • b)(2) Both Statement-I and Statement-II are incorrect.
    • c)(3) Statement-I is correct but Statement-II is incorrect.
    • d)(4) Statement-I is incorrect but Statement-II is correct.
91. Q91.Organic Chemistry

    The following carbocation is stabilized by the interaction of the empty p orbital with

    • a)(1) filled \(\sigma\) and filled \(\pi\) orbitals
    • b)(2) empty \(\sigma\) and empty \(\pi\) orbitals
    • c)(3) empty \(\sigma\) * and filled \(\pi\) orbitals
    • d)(4) empty \(\sigma\) * and empty \(\pi\) * orbitals
92. Q92.Inorganic Chemistry

    In potash alum, the ratio of \(\ce{K+}\) and \(\ce{SO4^2-}\) ions is

    • a)(1) 1:2
    • b)(2) 2:1
    • c)(3) 2:3
    • d)(4) 3:2
93. Q93.Biochemistry

    The correct statement about peptides and proteins is

    • a)(1) Tertiary structure of proteins has two or more polypeptide subunits.
    • b)(2) Only the proteins having a quaternary structure are biologically active.
    • c)(3) In \(eta\)-pleated sheet structures, peptide chains are held together by intermolecular hydrogen bonds.
    • d)(4) In \(\alpha\)-helices, the polypeptide chain is twisted into a left-handed screw (helix) through intramolecular hydrogen bonds.
94. Q94.Number System

    The numbers 17.0145 and 21.0235 were rounded to three figures after the decimal point. The resulting numbers, respectively, are

    • a)(1) 17.014 and 21.023
    • b)(2) 17.015 and 21.023
    • c)(3) 17.014 and 21.024
    • d)(4) 17.015 and 21.024
95. Q95.Physical Chemistry

    The correct order of solubility of the given salts in water at 298 K is

    • a)(1) \(\ce{Hg2Cl2}\) > \(\ce{Zn(OH)2}\) > \(\ce{AgBr}\)
    • b)(2) \(\ce{AgBr}\) > \(\ce{Zn(OH)2}\) > \(\ce{Hg2Cl2}\)
    • c)(3) \(\ce{Hg2Cl2}\) > \(\ce{AgBr}\) > \(\ce{Zn(OH)2}\)
    • d)(4) \(\ce{Zn(OH)2}\) > \(\ce{AgBr}\) > \(\ce{Hg2Cl2}\)
96. Q96.Inorganic Chemistry

    Among the following options, the correct trend in the electron gain enthalpy is

    • a)(1) \(\ce{F > Cl > Br > I}\)
    • b)(2) \(\ce{Br > Cl > F > I}\)
    • c)(3) \(\ce{Cl > Br > F > I}\)
    • d)(4) \(\ce{I > Br > Cl > F}\)
97. Q97.Physical Chemistry

    Assertion A: For an ideal solution formed by mixing liquids P and Q, \(\Delta ext{mix}\) H = 0 and \(\Delta ext{mix}\) V = 0 Reason R: No interactions occur between P and Q. In the light of the above statements, choose the most appropriate answer from the options given below.

    • a)(1) Both A and R are correct and R is the correct explanation of A
    • b)(2) Both A and R are correct but R is NOT the correct explanation of A
    • c)(3) A is correct but R is not correct
    • d)(4) A is not correct but R is correct
98. Q98.Organic Chemistry

    The amino acid that gives a red-colour on treating its sodium nitroprusside fusion extract with sodium nitroprusside is

    • a)(1) Leucine
    • b)(2) Threonine
    • c)(3) Methionine
    • d)(4) Serine
99. Q99.Physical Chemistry

    The standard electrode potential (\( ext{E}^\circ\)) for the half-cell reaction \(\ce{Fe^3+ + e- -> Fe^2+}\) at 298 K is \( ext{E}^\circ(\ce{Fe^3+}/\ce{Fe^2+}) = -0.04 ext{ V}\) and (\( ext{E}^\circ(\ce{Fe^2+}/\ce{Fe}) = -0.44 ext{ V}\) at 298 K). The standard electrode potential \( ext{E}^\circ\) for \(\ce{Fe^3+ + 3e- -> Fe}\) at 298 K is

    • a)(1) \(+0.76 ext{ V}\)
    • b)(2) \(-0.48 ext{ V}\)
    • c)(3) \(-0.25 ext{ V}\)
    • d)(4) \(-0.04 ext{ V}\)
100. Q100.Physical Chemistry

     In an acidic medium, 10 mL of 0.25 M oxalic acid is titrated with \(\ce{KMnO4}\) solution. If the volume of \(\ce{KMnO4}\) solution required to reach end point is 10 mL, the strength of the \(\ce{KMnO4}\) solution is

     • a)(1) 0.10 M
     • b)(2) 0.15 M
     • c)(3) 0.25 M
     • d)(4) 0.05 M
101. Q101.Inorganic Chemistry

     According to crystal field theory, the correct order of ligands with respect to their decreasing order of field strength is

     • a)(1) \(\ce{CO > NH3 > H2O > Cl-}\)
     • b)(2) \(\ce{CO > H2O > NH3 > Cl-}\)
     • c)(3) \(\ce{Cl- > H2O > NH3 > CO}\)
     • d)(4) \(\ce{Cl- > NH3 > H2O > CO}\)
102. Q102.Physical Chemistry

     Two moles of an ideal gas undergo free expansion from 10 L to 100 L at 300 K. The values of \(\Delta ext{S}_ ext{system}\) and \(\Delta ext{S}_ ext{surroundings}\) are (R is universal gas constant)

     • a)(1) \(\Delta ext{S}_ ext{system} = 0, \Delta ext{S}_ ext{surroundings} = 0\)
     • b)(2) \(\Delta ext{S}_ ext{system} = 4.606 ext{ R}, \Delta ext{S}_ ext{surroundings} = -4.606 ext{ R}\)
     • c)(3) \(\Delta ext{S}_ ext{system} = 4.606 ext{ R}, \Delta ext{S}_ ext{surroundings} = 0\)
     • d)(4) \(\Delta ext{S}_ ext{system} = 0, \Delta ext{S}_ ext{surroundings} = -4.606 ext{ R}\)
103. Q103.Physical Chemistry

     \(\ce{2A -> B}\) is a zero-order reaction, where \(k = 1.0 ext{ L mol}^{-1} ext{ min}^{-1}\). If the initial concentration of A is 2 M, then the time taken to complete 75% of the reaction will be

     • a)(1) 1.5 min
     • b)(2) 0.75 min
     • c)(3) 1.0 min
     • d)(4) 2.0 min
104. Q104.Inorganic Chemistry

     Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Generally, 3d transition metals have high melting points. Reason R : Involvement of 3d-electrons in addition to 4s electrons in the interatomic metallic bonding. In light of the above statements, choose the most appropriate answer from the options given below:

     • a)Both A and R are correct and R is the correct explanation of A.
     • b)Both A and R are correct and R is NOT the correct explanation of A.
     • c)A is correct but R is not correct.
     • d)A is not correct but R is correct.
105. Q105.Electrochemistry

     For a salt \ce{XY}, which is a strong electrolyte, the plot of \(\Lambda_m\) versus \(\sqrt{c}\) has a slope of \(-90.0\) S cm\(^2\) mol\(^{-3/2}\) L\(^{1/2}\) at 298 K. At 0.01 M concentration of \ce{XY}, the value of \(\Lambda_m\) is 145.0 S cm\(^2\) mol\(^{-1}\). The limiting molar conductivity of \(\mathrm{Y^-}\) ion (\(\lambda_{\mathrm{Y^-}}^0\)), in S cm\(^2\) mol\(^{-1}\), at 298 K will be (Given: \(\Lambda_{\mathrm{X^+}}^0 = 74.0\) S cm\(^2\) mol\(^{-1}\))

     • a)80.0
     • b)100.0
     • c)90.0
     • d)76.0
106. Q106.Stoichiometry

     The amount of carbon dioxide evolved upon complete combustion of 116 g of n-butane is (Given: atomic mass in amu H = 1, C = 12 and O = 16)

     • a)352 g
     • b)322 g
     • c)176 g
     • d)362 g
107. Q107.Chemical Kinetics

     For an elementary chemical reaction, the Arrhenius plot is given below. If the energy of activation is \(6.64\) kJ mol\(^{-1}\) and \(\mathrm{R} = 8.3\) J K\(^{-1}\) mol\(^{-1}\), the temperature at which the rate constant becomes \(\mathrm{e}^2\) min\(^{-1}\), is

     • a)125 K
     • b)150 K
     • c)200 K
     • d)250 K
108. Q108.Redox Reactions

     Given below are two statements: Statement-I : Heating \ce{NaI} with concentrated \ce{H2SO4} and \ce{MnO2} results in reduction of \ce{Mn}. Statement-II : Heating \ce{NaCl} with concentrated \ce{H2SO4} and \ce{MnO2} results in oxidation of \ce{Mn}. In light of the above statements, choose the most appropriate answer from the options given below:

     • a)Both Statement-I and Statement-II are correct.
     • b)Both Statement-I and Statement-II are incorrect.
     • c)Statement-I is correct but Statement-II is incorrect.
     • d)Statement-I is incorrect but Statement-II is correct.
109. Q109.Coordination Compounds

     Among the species given below, the spin-only magnetic moment is highest for (Given : Atomic number of Ti = 22, Mn = 25, Fe = 26 and Co = 27)

     • a)\([\ce{Mn(CN)6}]^{3-}\)
     • b)\([\ce{Fe(CN)6}]^{3-}\)
     • c)\([\ce{Co(NH3)6}]^{3+}\)
     • d)\([\ce{Ti(H2O)6}]^{3+}\)
110. Q110.f-block elements

     The lanthanide ion having four unpaired electrons is (Given : Atomic numbers of Ce = 58, Nd = 60, Tb = 65 and Ho = 67)

     • a)\(\ce{Nd^3+}\)
     • b)\(\ce{Ce^3+}\)
     • c)\(\ce{Tb^3+}\)
     • d)\(\ce{Ho^3+}\)
111. Q111.Coordination Compounds

     The formula of tetraammineaquachloridocobalt(III) chloride is

     • a)\([\ce{Co(NH3)4Cl}] \times \ce{H2O}\)
     • b)\([\ce{Co(NH3)4Cl}] \ce{Cl} \times \ce{H2O}\)
     • c)\([\ce{Co(NH3)4(H2O)Cl}] \ce{Cl}\)
     • d)\([\ce{Co(NH3)4(H2O)Cl}] \ce{Cl2}\)
112. Q112.Periodic table

     Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The first ionization enthalpy of O is lower than that of N and F. Reason R : The loss of an electron from O leads to stable half-filled p orbital. In light of the above statements, choose the most appropriate answer from the options given below:

     • a)Both A and R are correct and R is the correct explanation of A.
     • b)Both A and R are correct and R is NOT the correct explanation of A.
     • c)A is correct but R is not correct.
     • d)A is not correct but R is correct.
113. Q113.Solutions

     Consider the following statements about the solutions formed by mixing two liquids. A. An ideal solution thus formed obeys Raoult's law throughout the composition range. B. Mixture of chloroform and acetone shows negative deviation from Raoult's law. C. Mixture of aniline and phenol shows positive deviation from Raoult's law. The correct option is

     • a)A and B only
     • b)A and C only
     • c)A only
     • d)A, B and C only
114. Q114.Organic reactions

     One of the products formed in the following reaction is \[ \mathrm{MgBr}+\mathrm{NH}_2 \longrightarrow \]

     • a)Cyclohexylamine
     • b)A structure with two cyclohexane rings and NH3
     • c)Cyclohexane and NH3
     • d)Cyclohexane
115. Q115.Chemical bonding

     The correct statement is

     • a)Boron has a maximum covalency of four.
     • b)Beryllium has three valence orbitals.
     • c)Magnesium has a maximum covalency of four.
     • d)Aluminium has five valence orbitals.
116. Q116.Chemical thermodynamics

     A protein undergoes reversible thermal denaturation from its initial state \(N\) to denatured state \(D\) according to \(N \rightleftharpoons D\). At \(60^\circ \mathrm{C}\), the concentrations of both \(N\) and \(D\) are equal at equilibrium, and the standard enthalpy change of denaturation is \(666 \mathrm{~kJ~mol}^{-1}\). The standard entropy change \((\Delta S^\circ \mathrm{~in~kJ~K}^{-1} \mathrm{mol}^{-1})\) of the protein upon denaturation at \(60^\circ \mathrm{C}\) is closest to

     • a)2.0
     • b)2000.0
     • c)333.0
     • d)11.1
117. Q117.Molecular geometry

     Match the species in List I with their geometry in List II **List I** A. \(\mathrm{PCl_5}\) B. \(\mathrm{BF_5}\) C. \(\mathrm{BF_4^{-}}\) D. \([\mathrm{Ni(CN)_4}]^{2-}\) **List II** I. Tetrahedral II. Square Planar III. Trigonal bipyramidal IV. Square pyramidal

     • a)A-IV, B-III, C-I, D-II
     • b)A-III, B-IV, C-I, D-II
     • c)A-III, B-I, C-II, D-IV
     • d)A-III, B-II, C-I, D-IV
118. Q118.Organic reactions

     Given below are two statements : **Statement I:** trans-But-2-ene upon treatment with \(\mathrm{Br_2}\) in \(\mathrm{CCl_4}\) gives the following product **Statement II:** cis-But-2-ene upon treatment with alkaline \(\mathrm{KMnO_4}\) gives the following product In the light of the above statements, choose the most appropriate answer from the options given below.

     • a)Both Statement I and Statement II are correct
     • b)Both Statement I and Statement II are incorrect
     • c)Statement I is correct but Statement II is incorrect
     • d)Statement I is incorrect but Statement II is correct
119. Q119.Organic Reactions

     Consider the following reaction sequences: \[ \mathrm{Ph-C\equiv C-Me} \xrightarrow{\mathrm{H_2, Pd/C}} L \] \[ \mathrm{Ph-C\equiv C-Me} \xrightarrow{\mathrm{Na/Liq. NH_3}} M \] \[ \mathrm{Ph-C\equiv C-Me} \xrightarrow{\text{(Lindlar's Catalyst) H_2}} N \] Choose the correct option.

     • a)K and L are geometrical isomers
     • b)K and L are enantiomers
     • c)M and N are geometrical isomers
     • d)M and N are stereoisomers
120. Q120.Coordination Compounds

     The complex which has facial and meridional isomers is (Given: \(\mathrm{py}\) = pyridine and \(\mathrm{en} = \mathrm{H_2N-CH_2-CH_2-NH_2}\))

     • a)\([\mathrm{Cr(py)_3Cl_3}]\)
     • b)\([\mathrm{Cr(H_2O)_6}]^{3+}\)
     • c)\([\mathrm{Co(NH_3)_4(H_2O)_2}]^{3+}\)
     • d)\([\mathrm{Ni(en)_2(H_2O)_2}]^{2+}\)
121. Q121.Organic Reactions

     Identify the reactions which give aniline as the major product.

     • a)Reaction A: \(\ce{C6H5CN} \xrightarrow{\ce{LiAlH4}}\)
     • b)Reaction B: \(\ce{C6H5NO2} \xrightarrow{\ce{KOH, Br2}}\)
     • c)Reaction C: \(\ce{C6H5NO2} \xrightarrow{\ce{NaBH4}}\)
     • d)Reaction D: \(\ce{C6H5CONH2} \xrightarrow{\ce{HCl/H2O, \Delta}}\)
122. Q122.Vitamins and sources

     Match the vitamins in List I with their sources in List II **List I** A. Vitamin A B. Vitamin \(\mathrm{B_{12}}\) C. Vitamin E D. Vitamin K **List II** I. meat II. sunflower oil III. green leafy vegetables IV. carrots

     • a)A-II, B-III, C-IV, D-I
     • b)A-IV, B-I, C-II, D-III
     • c)A-IV, B-II, C-I, D-III
     • d)A-III, B-I, C-IV, D-II
123. Q123.Chemical Bonding

     The correct decreasing order of oxidation state of the underlined atom in each molecule is

     • a)\(\mathrm{P_4O_{10} > SO_3 > H_2O}\)
     • b)\(\mathrm{N_2O_5 > Al_2O_3 > H_2S}\)
     • c)\(\mathrm{PbO_2 > N_2O_3 > SO_3}\)
     • d)\(\mathrm{P_4O_{10} > Cl_2O_7 > NH_3}\)
124. Q124.Organic Reactions

     The compound that CANNOT be obtained from the aldol condensation reaction shown below, is

     • a)1
     • b)2
     • c)3
     • d)4
125. Q125.Organic Structure

     Among the following, the compound having conjugated double bonds is

     • a)hepta-1,3-diene
     • b)hepta-1,4-diene
     • c)hepta-1,5-diene
     • d)hepta-1,6-diene
126. Q126.Organic Reactions

     Given below are two statements: Statement-I: Oxidation of p-nitrotoluene with acidic \ce{KMnO4} gives an acid that is stronger than benzoic acid. Statement-II: Reduction of p-nitrotoluene with \ce{Sn/HCl} followed by neutralization gives an amine that is more basic than aniline. In light of the above statements, choose the most appropriate answer from the options given below.

     • a)Both Statement-I and Statement-II are correct.
     • b)Both Statement-I and Statement-II are incorrect.
     • c)Statement-I is correct but Statement-II is incorrect.
     • d)Statement-I is incorrect but Statement-II is correct.
127. Q127.Inorganic Reactions

     The green paramagnetic species formed by heating \ce{KMnO4} at 513 K is

     • a)\ce{K2MnO4}
     • b)\ce{Mn2O4}
     • c)\ce{MnO}
     • d)\ce{KO2}
128. Q128.Organic Compound Reactions

     Consider the following reaction, choose the correct option.

     • a)On treating compound P with saturated \ce{NaHCO3} solution, brisk effervescence is observed.
     • b)Compound P can be prepared by treating benzene with anhydrous \ce{AlCl3} and \ce{CH3COCl}.
     • c)On treatment with bromine water, compound P gives a white precipitate.
     • d)Compound P is obtained by hydrogenation of benzoyl chloride with \ce{Pd} on \ce{BaSO4}.
129. Q129.Coordination Compounds

     A 1:3 electrolyte in an aqueous solution

     • a)\ce{[CoCl2(NH3)4]Cl}
     • b)\ce{[CoCl(NH3)5]Cl2}
     • c)\ce{[Co(NH3)6]Cl3}
     • d)\ce{[Co(NH3)3(NO2)3]}
130. Q130.Atomic Structure

     Consider the following schematic plots of orbital wavefunction (\( \psi_r \)) against distance (r) from the nucleus. The figure representing two radial nodes in the orbital is

     • a)A
     • b)B
     • c)C
     • d)D
131. Q131.Molecular Properties

     Arrange the following compounds in the increasing order of polarity A. \ce{CH3CH2OCH2CH3} B. \ce{CH3CH2OH} C. \ce{CH3COOH} D. \ce{CH3COCH3} Choose the correct answer from the options given below.

     • a)A < B < C < D
     • b)C < A < D < B
     • c)A < C < B < D
     • d)A < D < B < C
132. Q132.Molecular Orbital Theory

     The highest occupied molecular orbital for \ce{N2} is

     • a)\( \pi 2p \)
     • b)\( \sigma 2p \)
     • c)\( \pi^* 2p \)
     • d)\( \sigma^* 2p \)
133. Q133.p-Block Elements

     Given below are two statements: Statement I: Like nitrogen that can form ammonia, arsenic can form arsine. Statement II: Antimony cannot form antimony pentoxide. In the light of the above statements, choose the most appropriate answer from the options given below:

     • a)Both Statement I and Statement II are correct.
     • b)Both Statement I and Statement II are incorrect.
     • c)Statement I is correct but Statement II is incorrect.
     • d)Statement I is incorrect but Statement II is correct.
134. Q134.Atomic Structure

     Which among the following electronic configurations belong to main group elements? A. \([{\text{Ne}}]3{\text{s}}^1\) B. \([{\text{Ar}}]3{\text{d}}^3\;4{\text{s}}^2\) C. \([{\text{Kr}}]4{\text{d}}^{10}5{\text{s}}^25{\text{p}}^5\) D. \([{\text{Ar}}]3{\text{d}}^{10}4{\text{s}}^1\) E. \([{\text{Rn}}]5{\text{f}}^66{\text{d}}^27{\text{s}}^2\) Choose the correct answer from the options given below:

     • a)B and E only
     • b)A and C only
     • c)D and E only
     • d)A, C and D only
135. Q135.Basic Concepts Chemistry

     Dalton's Atomic theory could not explain which of the following?

     • a)Law of conservation of mass
     • b)Law of constant proportion
     • c)Law of multiple proportion
     • d)Law of gaseous volume
136. Q136.Chemical Bonding

     Consider the following compounds: \(\ce{KO2}\), \(\ce{H2O2}\) and \(\ce{H2SO4}\) The oxidation states of the underlined elements in them are, respectively,

     • a)+1, –1, and +6
     • b)+2, –2, and +6
     • c)+1, –2, and +4
     • d)+4, –4, and +6
137. Q137.Chemical Kinetics

     If the half-life (\(t_{1/2}\)) for a first order reaction is 1 minute, then the time required for 99.9% completion of the reaction is closet to:

     • a)2 minutes
     • b)4 minutes
     • c)5 minutes
     • d)10 minutes
138. Q138.Coordination Compounds

     The correct order of the wavelength of light absorbed by the following complexes is, A. \([{\text{Co}}({\text{NH}}_3)_6]^{3+}\) B. \([{\text{Co}}({\text{CN}})_6]^{3-}\) C. \([{\text{Cu}}({\text{H}}_2{\text{O}})_4]^{2+}\) D. \([{\text{Ti}}({\text{H}}_2{\text{O}})_6]^{3+}\) Choose the correct answer from the options given below:

     • a)B < D < A < C
     • b)B < A < D < C
     • c)C < D < A < B
     • d)C < A < D < B
139. Q139.Organic Chemistry

     Which one of the following compounds can exist as cis-trans isomers?

     • a)Pent-1-ene
     • b)2-Methylhex-2-ene
     • c)1,1-Dimethylcyclopropane
     • d)1,2-Dimethylcyclohexane
140. Q140.Ionic Equilibrium

     Phosphoric acid ionizes in three steps with their ionization constant values \({\text{K}}_{{\text{a}}_1}\), \({\text{K}}_{{\text{a}}_2}\) and \({\text{K}}_{{\text{a}}_3}\), respectively, while K is the overall ionization constant. Which of the following statements are true? A. \(\log {\text{K}} = \log {\text{K}}_{{\text{a}}_1} + \log {\text{K}}_{{\text{a}}_2} + \log {\text{K}}_{{\text{a}}_3}\) B. \(\ce{H3PO4}\) is stronger acid than \(\ce{H2PO4^{-}}\) and \(\ce{HPO4^{2-}}\). C. \({\text{K}}_{{\text{a}}_1} > {\text{K}}_{{\text{a}}_2} > {\text{K}}_{{\text{a}}_3}\) D. \({\text{K}}_{{\text{a}}_1} = \frac{{\text{K}}_{{\text{a}}_3} + {\text{K}}_{{\text{a}}_2}}{2}\) Choose the correct answer from the options given below:

     • a)A and B only
     • b)A and C only
     • c)B, C and D only
     • d)A, B and C only
141. Q141.Electrochemistry

     If the molar conductivity \((\Lambda_m)\) of a 0.050 mol \(L^{-1}\) solution of a monobasic weak acid is 90 S \(cm^2\) \(mol^{-1}\), its extent (degree) of dissociation will be [Assume \(\Lambda^\circ_m = 349.6 S \,cm^2\,mol^{-1}\) and \(\Lambda^\circ_H = 50.4 S \,cm^2\,mol^{-1}\)]

     • a)0.115
     • b)0.125
     • c)0.225
     • d)0.215
142. Q142.Chemical Bonding

     Given below are two statements: **Statement I:** A hypothetical diatomic molecule with bond order zero is quite stable. **Statement II:** As bond order increases, the bond length increases. In the light of the above statements, chose the **most appropriate** answer from the options given below:

     • a)Both statement I and Statement II are true
     • b)Both statement I and Statement II are false
     • c)Statement I is true but Statement II is false
     • d)Statement I is true but Statement II is true
143. Q143.Coordination Compounds

     Out of the following complex compounds, which of the compound will be having the minimum conductance is solution?

     • a)\(\ce{[Co(NH3)3Cl3]}\)
     • b)\(\ce{[Co(NH3)4Cl2]Cl}\)
     • c)\(\ce{[Co(NH3)6]Cl3}\)
     • d)\(\ce{[Co(NH3)5Cl]Cl2}\)
144. Q144.Chemical Bonding

     Match the List-I with List-II. List-I (Example) A. \(\ce{XeO3}\) B. \(\ce{XeF2}\) C. \(\ce{XeOF4}\) D. \(\ce{XeF6}\) List-II I. \(\ce{sp^3d}\); linear II. \(\ce{sp^3}\); pyramidal III. \(\ce{sp^3d^3}\); distorted octahedral IV. \(\ce{sp^3d^2}\); square pyramidal Choose the **correct** answer from the options given below.

     • a)A-II, B-I, C-IV, D-III
     • b)A-II, B-I, C-III, D-IV
     • c)A-IV, B-II, C-III, D-I
     • d)A-IV, B-II, C-I, D-III
145. Q145.Chemical Thermodynamics

     \(\ce{C(s) + 2H2(g) -> CH4(g)}; \Delta H= -74.8 \,kJ \,mol^{-1}\) Which of the following diagrams gives an accurate representation of the above reaction? [R \(\rightarrow\) reactants; P \(\rightarrow\) products]

     • a) (1)
     • b) (2)
     • c) (3)
     • d) (4)
146. Q146.Solutions & Mixtures

     Match the List-I with List-II. List-I (Example) A. Humidity B. Alloys C. Amalgams D. Smoke List-II (Type of Solution) I. Solid in solid II. Liquid in gas III. Solid in gas IV. Liquid in solid Choose the **correct** answer from the options given below.

     • a)A-II, B-IV, C-I, D-III
     • b)A-II, B-I, C-IV, D-III
     • c)A-III, B-I, C-IV, D-II
     • d)A-III, B-II, C-I, D-IV
147. Q147.Organic Chemistry

     The correct order of decreasing basic strength of the given amines is:

     • a)N-methylaniline > benzenamine > ethanamine > N-ethylethanamine
     • b)N-ethylethanamine > ethanamine > benzenamine > N-methylaniline
     • c)N-ethylethanamine > ethanamine > N-methylaniline > benzenamine
     • d)benzenamine > ethanamine > N-methylaniline > N-ethylethylethanamine
148. Q148.Basic Concepts Chemistry

     Among the following, choose the ones with equal number of atoms. A. 212 g of \(\ce{Na2CO3}\)(s) [molar mass = 106 g] B. 248 g of \(\ce{Na2O}\)(s) [molar mass = 62 g] C. 240 g of \(\ce{NaOH}\)(s) [molar mass = 40 g] D. 12 g of \(\ce{H2(g)}\) [molar mass = 2 g] E. 220 g of \(\ce{CO2(g)}\) [molar mass = 44 g] Choose the correct answer from the options given below:

     • a)A, B, and C only
     • b)A, B, and D only
     • c)B, C, and D only
     • d)B, D, and E only
149. Q149.Biomolecules

     Match the List-I with List-II. List-I (Name of Vitamin) A. Vitamin \(\ce{B_{12}}\) B. Vitamin D C. Vitamin \(\ce{B_2}\) D. Vitamin \(\ce{B_6}\) List-II (Deficiency disease) I. Cheilosis II. Convulsions III. Rickets IV. Pernicious anaemia Choose the correct answer from the options given below:

     • a)A-I, B-III, C-II, D-IV
     • b)A-IV, B-III, C-I, D-II
     • c)A-II, B-III, C-I, D-IV
     • d)A-IV, B-III, C-II, D-I
150. Q150.Organic Chemistry

     The correct order of decreasing acidity of the following aliphatic acids is:

     • a)\((\ce{CH3})_3\ce{CCOOH} > (\ce{CH3})_2\ce{CHCOOH} > \ce{CH3COOH} > \ce{HCOOH}\)
     • b)\(\ce{CH3COOH} > (\ce{CH3})_2\ce{CHCOOH} > (\ce{CH3})_3\ce{CCOOH} > \ce{HCOOH}\)
     • c)\(\ce{HCOOH} > \ce{CH3COOH} > (\ce{CH3})_2\ce{CHCOOH} > (\ce{CH3})_3\ce{CCOOH}\)
     • d)\(\ce{HCOOH} > (\ce{CH3})_3\ce{CCOOH} > (\ce{CH3})_2\ce{CHCOOH} > \ce{CH3COOH}\)
151. Q151.Atomic Structure, Magnetism

     Given below are two statements; **Statement I:** Ferromagnetism is considered as an extreme form of paramagnetism. **Statement II:** The number of unpaired electrons in a \(\ce{Cr^{2+}}\) ion (Z=24) is the same as that of a \(\ce{Nd^{3+}}\) ion (Z=60). In the light of the above statements, choose the correct answer from the options given below:

     • a)Both Statement I and Statement II are true
     • b)Both Statement I and Statement II are false
     • c)Statement I is true but Statement II is false
     • d)Statement I is false but Statement II is true
152. Q152.Separation techniques

     Match the List-I with List-II. List-I (Mixture) A. \(\ce{CHCl3 + C6H5NH2}\) B. Crude oil in petroleum industry C. Glycerol from spent-lye D. Aniline-water List-II (Method of Separation) I. Distillation under reduced pressure II. Steam distillation III. Fractional distillation IV. Simple distillation Choose the correct answer from the options given below.

     • a)A-IV, B-III, C-I, D-II
     • b)A-IV, B-III, C-II, D-I
     • c)A-III, B-IV, C-I, D-II
     • d)A-III, B-IV, C-II, D-I
153. Q153.Chemical equilibrium

     For the reaction \(\ce{A(g) <=> 2B(g)}\), the backward reaction rate constant is higher than the forward reaction rate constant by a factor of 2500, at 1000 K. [Given: R= 0.0831 L atm \(\text{mol}^{-1} \text{K}^{-1}\)] \(\ce{K_p}\) for the reaction at 1000 K is

     • a)83.1
     • b)\(2.077\times 10^5\)
     • c)0.033
     • d)0.021
154. Q154.Organic reactions

     Given below are two statements: **Statement I:** Benzenediazonium salt is prepared by the reaction of aniline with nitrous acid at 273-278 K. It decomposes easily in the dry state. **Statement II:** Insertion of iodine into the benzene ring is difficult and hence iodobenzene is prepared through the reaction of benzenediazonium salt with KI. In the light of the above statements, choose the most appropriate answer from the options given below:

     • a)Both Statement I and Statement II are correct
     • b)Both Statement I and Statement II are incorrect
     • c)Statement I is correct but Statement II is incorrect
     • d)Statement I is incorrect but Statement II is correct
155. Q155.Organic stereochemistry

     How many products (including stereoisomers) are expected from monochlorination of the following compound? \(\ce{H3C} \qquad \ce{CH - CH2 - CH3} \ce{H3C}\)

     • a)2
     • b)3
     • c)5
     • d)6
156. Q156.Chemical bonding

     Among the given compounds I-III, the correct order of bond dissociation energy of C–H bond marked with * is:

     • a)II > I > III
     • b)I > II > III
     • c)III > II > I
     • d)II > III > I
157. Q157.Organic reactions

     Which one of the following compounds does not decolorize bromine water?

     • a)⑳ ⛧
     • b)⑴ ⛧ —OH
     • c)⑵ ⛧ —CH═CH₂
     • d)⑶ ⛧ —NH₂
158. Q158.Organic reactions

     The major product of the following reaction is:

     • a)⑳ ⛧ C₃(OH) CH₂ CH₂ CN
     • b)⑴ ⛧ C₃(OH) CH₂ CH₂ CH₃
     • c)⑵ H₃C   OH   OH C₃ CH₂ CH₂ CH₃
     • d)⑶ ⛧ C₃O CH₂ CH₂ C₃O CH₃
159. Q159.Solutions & colloids

     Which of the following aqueous solution will exhibit highest boiling point?

     • a)0.01 M Urea
     • b)0.01 M KNO₃
     • c)0.01 M Na₂SO₄
     • d)0.015 M C₆H₁₂O₆
160. Q160.Chemical processes

     Boiling-point elevation (ΔTb) ∝m, where i is the van't Hoff factor and m the molarity (≈molality for these dilute solutions). Urea and glucose are non-electrolytes (i=1). KNO₃ gives two ions (i≈2). Na₂SO₄ dissociates into 2Na⁺ + SO₄²⁻ (i≈3), so ΔTb—and therefore the boiling point—is highest for the Na₂SO₄ solution. Haber process uses finely divided Fe catalyst. Wacker oxidation converts alkenes to aldehydes with PdCl₂/CuCl₂. Wilkinson catalyst, [(PPh₃)₃RhCl)], enables homogeneous hydrogenation. Ziegler–Natta polymerisation employs TiCl₄ partnered with Al(CH₃)₃.

     • a)A - I
     • b)B - II
     • c)C - III
     • d)D - IV
161. Q161.Solution properties

     5 moles of liquid X and 10 moles of liquid Y make a solution having a vapour pressure of 70 torr. The vapour pressures of pure X and Y are 63 torr and 78 torr respectively. Which of the following is true regarding the described solution?

     • a)The solution shows positive deviation.
     • b)The solution shows negative deviation.
     • c)The solution is ideal.
     • d)The solution has volume greater than the sum of individual volumes.
162. Q162.Organic Chemistry

     Sugar ‘X’ A. is found in honey. B. is a keto sugar. C. exists in α and β – anomeric forms. D. is laevorotatory. ‘X’ is:

     • a)D-Glucose
     • b)D-Fructose
     • c)Maltose
     • d)Sucrose
163. Q163.Organic reactions

     Identify the suitable reagent for the following conversion.

     • a)(i) LiAlH₄, (ii) H⁺/H₂O
     • b)(i) AlH(iBu)₂, (ii) H₂O
     • c)(i) NaBH₄, (ii) H⁺/H₂O
     • d)(i) H₂/Pd-BaSO₄
164. Q164.Organic reactions

     Given below are two statement: one is labelled as Assertion (A) and the other is labelled as Reason (R): Assertion (A): \(\ce{CH3-CH2-CH2-CH2-CH2-I}\) undergoes \(\ce{S_N2}\) reaction faster than \(\ce{CH3-CH2-CH2-CH2-CH2-Cl}\). Reason (R): Iodine is a better leaving group because of its large size. In the light of the above statements, choose the correct answer from the options given below:

     • a)Both A and R are true and R is the correct explanation of A.
     • b)Both A and R are true but R is not the correct explanation of A.
     • c)A is true but R is false.
     • d)A is false but R is true.
165. Q165.Thermochemistry

     The standard heat of formation, in \( ext{kcal/mol}\) of \(\ce{Ba^2+}\) is: [Given : standard heat of formation of \(\ce{SO_4^2-}\) ion (aq)\(= ext{-216 kcal/mol}\), standard heat of crystallization of \(\ce{BaSO4(s)}\) \(= ext{-4.5 kcal/mol}\), standard heat of formation of \(\ce{BaSO4(s)}\) \(= ext{-349 kcal/mol}\)]

     • a)\( ext{-128.5}\)
     • b)\( ext{-133.0}\)
     • c)\( ext{+133.0}\)
     • d)\( ext{+220.5}\)
166. Q166.Organic Chemistry

     Total number of possible isomers (both structural as well as stereoisomers) of cyclic ethers of molecular formula \(\ce{C4H8O}\) is:

     • a)6
     • b)8
     • c)10
     • d)11
167. Q167.Molecular Properties

     Identify the correct orders against the property mentioned A. \(\ce{H2O > NH3 > CHCl3}\) - dipole moment B. \(\ce{XeF4 > XeO3 > XeF2}\) - number of lone pairs on central atom C. \(\ce{O-H > C-H > N-O}\) - bond length D. \(\ce{N2 > O2 > H2}\) - bond enthalpy

     • a)A, D only
     • b)B, D only
     • c)A, C only
     • d)B, C only
168. Q168.Chemical Equilibrium

     Higher yield of NO in \(\ce{N2(g) + O2(g) <=> 2NO(g)}\) can be obtained at \([\Delta H ext{ of the reaction } = ext{+180.7 kJ mol}^{-1}]\) A. higher temperature B. lower temperature C. higher concentration of \(\ce{N2}\) D. higher concentration of \(\ce{O2}\) Choose the correct answer from the options given below:

     • a)A, D only
     • b)B, C only
     • c)B, C, D only
     • d)A, C, D only
169. Q169.Chemical Kinetics

     If the rate constant of a reaction is \( ext{0.03 s}^{-1}\), how much time does it take for \( ext{7.2 mol L}^{-1}\) concentration of the reactant to get reduced to \( ext{0.9 mol L}^{-1}\)? (Given : \( ext{log 2 = 0.301}\))

     • a)\( ext{69.3 s}\)
     • b)\( ext{23.1 s}\)
     • c)\( ext{210 s}\)
     • d)\( ext{21.0 s}\)
170. Q170.Organic Qualitative Analysis

     Which one of the following reactions does NOT belong to “Lassaigne’s test”?

     • a)\(\ce{Na + C + N ->[\Delta] NaCN}\)
     • b)\(\ce{2Na + S ->[\Delta] Na2S}\)
     • c)\(\ce{Na + X ->[\Delta] NaX}\)
     • d)\(\ce{2CuO + C ->[\Delta] 2Cu + CO2}\)