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Q.1 – Q.30 Multiple Choice Question (MCQ), carry ONE mark each
(for each wrong answer: – 1/3).
1. Adiabatic reversible expansion of a monoatomic gas (M) and a diatomic gas (D) at
an initial temperature 𝐓𝐢 , has been carried out independently from initial volume 𝐕𝟏
to final volume 𝐕𝟐 . The final temperature attained will be (𝐓𝐌 for monoatomic and
𝐓𝐃 for diatomic)
(a) TM = TD > Ti (b) TM < TD < Ti
(c) TM > TD > Ti (d) TD < TM < Ti
2. The rate of evaporation of a liquid is always faster at a higher temperature because
(a) The enthalpy of vaporisation is always endothermic
(b) The enthalpy of vaporisation is always exothermic
(c) The enthalpy of vaporisation is zero
(d) The internal pressure of the liquid is less than that of the gas
3. The internal pressure of a Vander Waals gas is:
(a) Independent of the molar volume
(b) Inversely proportional to the molar volume
(c) Inversely proportional to square of the molar volume
(d) Directly proportional to the molar volume.
4. 𝐤𝟏 𝐤𝟐
In a consecutive first order reaction, 𝐀 → 𝐁→ 𝐂 (where 𝐤 𝟏
and 𝐤 𝟐 are the respective rate constants) species-B has transient existence.
Therefore,
(a) k1 ≈ k 2 (b) k1 = 2k 2 (c) k1 ≫ k 2 (d) k1 ≪ k 2
5. For a free radical polymerisation reaction, the kinetic chain length ‘𝛄’, is defined as
the ratio
propagation rate initiation rate initiation rate propagation rate
(a) (b) propagation rate (c) termination rate (d)
initiation rate termination rate

6. The reaction that proceeds autocatalytically is

(a) an oscillatory reaction (b) hydrolysis of an ester by a mineral acid
(c) synthesis of ammonia (Haber’s process) (d) Ziegler-Natta polymerization
7. An example for an ion-selective electrode is
(a) quinhydrone electrode (b) hydrogen electrode
(c) glass electrode (d) dropping mercury electrode
8. The following equilibrium is established for an aqueous acetic acid solution

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𝐂𝐇𝟑 𝐂𝐎𝐎𝐇 ↔ 𝐂𝐇𝟑 𝐂𝐎𝐎− + 𝐇 +

Upon addition of 1.0 g of solid sodium chloride to 20 ml of 1N solution of acetic acid,
(a) the pH of the solution does not change (b) the pH of the solution decreases
(c) the pH of the solution increases (d) the pH of the solution is 7
9. According to MO theory, for the species ‘𝐂𝟐 ’
(a) bond order is zero and it is paramagnetic (b) bond order is zero and it is diamagnetic
(c) bond order is two and it is paramagnetic (d) bond order is two and it is diamagnetic
10. The sensitivity of a 600 MHz NMR spectrometer is more than that of a 60 MHz
spectrometer because
(a) Population of spin states is directly proportional to the applied magnetic field
(b) Population of spin states is inversely proportional to the applied magnetic field
(c) According to the Boltzmann distribution law, the excess population in the lower spin
state increases with increasing applied magnetic field
(d) The spectral scan width is more for a 600 MHz spectrum compared to a 60 MHz
spectrum
11. The magnetic moment of an octahedral Co (II) complex is 4.0 𝛍𝛃 . The electronic
configuration of the complex is:
(a) t 52g e2g (b) t 62g e1g (c) t 32g e4g (d) t 42g e3g
12. The square planar complex, [𝐈𝐫𝐂𝐥(𝐏𝐏𝐡𝟑 )𝟑 ] undergoes oxidative addition of 𝐂𝐥𝟐 to
give two products, which are
(a) fac and mer isomers (b) cis and trans isomers
(c) linkage isomers (d) enantiomers
13. The ligand field bands of lanthanide complexes are generally sharper than those of
transition metal complexes because
(a) transitions are allowed for lanthanide complexes
(b) intensity of the bands are higher for lanthanide complexes
(c) f–orbitals have higher energy than d–orbitals
(d) f–orbitals, compared to d–orbitals, interact less effectively with ligands
14. Nature has chosen Zn(II) ion at the active site of many hydrolytic enzymes because
(a) Zn (II) is poor Lewis acid
(b) Zn (II) does not have chemically accessible redox states
(c) Zn (II) forms both four and higher coordination complexes
(d) Zn (II) forms weak complexes with oxygen donor ligands.

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15. 𝐁𝐇𝟑 . 𝐂𝐎 is more stable than 𝐁𝐅𝟑 . 𝐂𝐎 because

(a) CO is a soft base and BH3 and BF3 are soft and hard acids respectively
(b) CO is a hard base and BH3 and BF3 are hard and soft acids respectively
(c) CO is a soft base and BH3 and BF3 are hard and soft acids respectively
(d) CO is a soft acid and BH3 and BF3 are soft and hard bases respectively
16. Using chlorobenzene as solvent, the reagents needed for an efficient synthesis of
borazine are
(a) NH4 Cl and BCl3 (b) NH4 Cl, BCl3 and NaBH4
(c) NH4 Cl and NaBH4 (d) NH3 and BCl3
17. The crystal systems having the highest and the lowest symmetries respectively, are
(a) cubic and rhombohedral (b) cubic and triclinic
(c) rhombohedral and monoclinic (d) cubic and monoclinic
18. The dark purple colour of 𝐊𝐌𝐧𝐎𝟒 is due to
(a) d-d transition (b) ligand field transition
(c) charge transfer transition (d) σ → π∗ transition
19. The metallic character of beryllium is due to
(a) partially filled 2s band (b) completely filled 2s band
(c) overlap of 2s and 2p bands (d) empty 2p band
20. The values of CO stretching frequencies of I - III follow the trend,
I II III
[𝐍𝐢(𝐂𝐎)𝟒 ] [𝐍𝐢(𝐂𝐎)𝟑 (𝐏𝐌𝐞𝟑 )] [𝐍𝐢(𝐂𝐎)𝟐 (𝐏𝐌𝐞𝟑 )𝟐 ]
(a) I > II > III (b) III > II > I (c) I > III > II (d) II > III > I
21. The products formed in the following reaction are

(a) (b)

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(c) (d)

22. The acyl anion equivalents, among the following compounds (P–S), are

P Q R S
(a) P and Q (b) Q and R (c) P and S (d) Q and S
23. 1H–NMR spectrum of a compound with molecular formula 𝐂𝟒 𝐇𝟗 𝐍𝐎𝟐 shows 𝛅 5.30
(broad, 1H), 4.10 (q, 2H), 2.80 (d, 3H), 1.20 (t, 3H) ppm. The structures of the
compound that is consistent with the above data is:
(a) CH3 NHCOOCH2 CH3 (b) CH3 CH2 NHCOOCH3
(c) CH3 OCH2 CONHCH3 (d) CH3 CH2 OCH2 CONH2
24. Among the following compounds, the one that undergoes deprotonation most
readily in the presence of a base, to form a carbanion is:
(a) (b) (c) (d)

25. The structure of the product formed in the reaction given below is

(a) (b) (c) (d)

26. Hydroboration of 1-methylcyclopentene using 𝐁𝟐 𝐃𝟔 , followed by treatment will

alkaline hydrogen peroxide, gives

(a) (b) (c) (d)

27. The enolate ion that reacts with 3-buten-2-one to form (Y) is

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(a) (b) (c) (d)

28. Electrocyclization of E,Z,E-octa-2,4,6-triene under photochemical condition,

(a) trans-5,6-dimethylcyclohexa-1,3-diene
(b) cis-5,6-dimethylcyclohexa-1,3-diene
(c) a mixture of trans and cis-5,6-dimethylcyclohexa-1,3-diene
(d) 1,2-dimethylcyclohexa-1,3-diene
29. The absolute configurations of the two chiral centers in the following molecule are

(a) 2R, 3S (b) 2R, 3R (c) 2S, 3S (d) 2S, 3R

30. A pyridine derivative-P reacts with (Y). (Y) can be a free radical, cation or anion.
The structure of intermediate-Q formed in the reaction is given below. (P) and (Y)
respectively, are

(a) (b) (c) (d)

Q.31 – Q.90 Multiple Choice Question (MCQ), carry TWO mark each
(for each wrong answer: – 2/3).

31. Column-I Column-II

P. 𝐙𝐧𝐒𝐎𝟒(𝐚𝐪) + 𝐊 𝟒 [𝐅𝐞(𝐂𝐍)𝟔 ](𝐚𝐪) ⟶ 𝐏𝐫𝐨𝐝𝐮𝐜𝐭𝐬 (i) Enzymatic reaction
Q. 𝐙𝐧(𝐬) + 𝐂𝐮𝐒𝐎𝟒(𝐚𝐪) ⟶ 𝐏𝐫𝐨𝐝𝐮𝐜𝐭𝐬 (ii) Chain reaction
R. ∆ (iii) Redox reaction
𝐇𝟐 + 𝐂𝐥𝟐 → 𝐏𝐫𝐨𝐝𝐮𝐜𝐭𝐬
S. Fischer-Tropsch synthesis of hydrocarbons (iv) Precipitation reaction
(v) Surface reaction
(vi) Hydrolysis reaction

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(P) (Q) (R) (S) (P) (Q) (R) (S)

(a) (ii) ; (iv) ; (v) ; (vi) (b) (i) ; (iii) ; (ii) ; (iv)
(c) (iv) ; (iii) ; (ii) ; (v) (d) (i) ; (vi) ; (ii) ; (v)

32. Column-I Column-II

P. Supporting electrolyte (i) Overpotential
Q. 𝐙𝐧(𝐇𝐠)𝐐=𝟏 | 𝐙𝐧𝐂𝐥𝟐(𝐚𝐪) | 𝐙𝐧(𝐇𝐠)𝐐=𝟐 (ii) Residual current
R. Inversion temperature (iii) Electrolyte concentration cell
S. Entropy of vapourisation (iv) Electrode concentration cell
(v) Trouton’s rule
(vi) Joule-Thomson expansion

(P) (Q) (R) (S) (P) (Q) (R) (S)

(a) (ii) ; (iv) ; (vi) ; (v) (b) (ii) ; (iv) ; (iii) ; (vi)
(c) (i) ; (iv) ; (vi) ; (iii) (d) (i) ; (iii) ; (vi) ; (vi)

33. Column-I Column-II

P. Kroenecker delta (i) Electronic transition
Q. Franck-Condon principle (ii) Isothermal process
R. Kirchoff’s equation (iii) Orthonormal set
S. Glass transition temperature (iv) Reaction enthalpy
(v) Turnover number
(vi) Polymer

(P) (Q) (R) (S) (P) (Q) (R) (S)

(a) (i) ; (iii) ; (v) ; (vi) (b) (iii) ; (i) ; (iv) ; (vi)
(c) (i) ; (iii) ; (v) ; (ii) (d) (iii) ; (i) ; (vi) ; (ii)

34. Enzyme Metal at the Active site

P. Liver alcohol dehydrogenase (i) Cu
Q. Cytochrome C oxidase (ii) Fe and Cu
R. Hemocyanin (iii) Zn

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S. Myoglobin (iv) Fe
(v) Mo
(vi) Cu and Zn

(P) (Q) (R) (S) (P) (Q) (R) (S)

(a) (vi) ; (ii) ; (i) ; (iv) (b) (iii) ; (ii) ; (i) ; (vi)
(c) (iii) ; (ii) ; (iv) ; (v) (d) (v) ; (vi) ; (i) ; (ii)

35. Column-I Column-II

P. [(𝐏𝐏𝐡𝟑 )𝟑 𝐑𝐡𝐂𝐥] (i) Friedel-Crafts catalyst
Q. [Rh(𝐂𝐎)𝟐 𝐈𝟐 ] (ii) Hydroformylation of alkenes
R. [𝐏𝐝𝐂𝐥𝟒 ]𝟐− (iii) Hydrogenation process
S. [HCo(𝐂𝐎)𝟒 ] (iv) The Wacker process
(v) Monsanto acetic acid synthesis
(vi) Reppe catalyst

(P) (Q) (R) (S) (P) (Q) (R) (S)

(a) (iii) ; (v) ; (iv) ; (ii) (b) (iv) ; (i) ; (vi) ; (ii)
(c) (v) ; (iv) ; (ii) ; (i) (d) (iii) ; (ii) ; (i) ; (v)

36. List-I List-II

P. [𝐂𝐫(𝐇𝟐 𝐎)𝟔 ]𝟑+ (i) 𝐂𝟑𝐕
Q. 𝐅𝐞𝟐 (𝐂𝐎)𝟗 (ii) 𝐃𝟑𝐡
R. Eclipsed ferrocene (iii) 𝐎𝐡
S. Staggered ferrocene (iv) 𝐃𝟓
T. Skew ferrocene (v) 𝐃𝟓𝐡
(vi) 𝐃𝟓𝐝

(P) (Q) (R) (S) (T)

(a) (iii) ; (ii) ; (v) ; (vi) ; (iv)
(b) (ii) ; (iv) ; (i) ; (iii) ; (v)
(c) (vi) ; (ii) ; (v) ; (i) ; (iv)
(d) (iii) ; (vi) ; (iv) ; (v) ; (i)

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37. For the reaction, 𝐇𝐠 𝟐 𝐂𝐥𝟐(𝐬) + 𝐇𝟐(𝐠) ⟶ 𝟐𝐇𝐠 (𝒍) + 𝟐𝐇𝐂𝐥(𝒂𝒒) , the correct representation
of the cell and the thermodynamic properties ∆𝐆, ∆𝐇 and ∆𝐒 at 298 K respectively,
are (given : 𝐄𝟐𝟗𝟖 = 𝟎. 𝟐𝟔𝟖𝟒 𝐕 and temperature coefficient = −𝟑 × 𝟏𝟎−𝟒 𝐕 𝐊 −𝟏 )
(a) Pt|H2 (g, 1atm)|HCl(aq)|Hg 2 Cl2 (s)|Hg()
∆G = −51.8 kJ mol−1 , ∆H = −69 kJ mol−1 , ∆S = −58 J K −1 mol−1
(b) Pt|H2 (g, 1atm)|HCl(aq)|Hg 2 Cl2 (s)|Hg()
∆G = −25.9 kJ mol−1 , ∆H = −34.5 kJ mol−1 , ∆S = −29 J K −1 mol−1
(c) Hg () | Hg 2 Cl2 (s)|HCl(aq)|H2 (g, 1atm)|Pt
∆G = −51.8 kJ mol−1 , ∆H = −69 kJ mol−1 , ∆S = 58 JK −1 mol−1
(d) Hg () | Hg 2 Cl2 (s)|HCl(aq)|H2 (g, 1atm)|Pt
∆G = 51.8 kJ mol−1 , ∆H = 69 kJ mol−1 , ∆S = 58 JK −1 mol−1
38. Among 𝐂𝐇𝟑 𝐂𝐥, 𝐂𝐇𝟐 𝐂𝐥𝟐 , 𝐂𝐇𝐂𝐥𝟑 , 𝐂𝐇𝟑 𝐁𝐫 and 𝐂𝐇𝟑 𝐈 in the gaseous state, the one having
highest molar entropy value at room temperature is
(a) CHCl3 (b) CH3 Cl (c) CH3 Br (d) CH3 I
39. Two solid components form a congruent melting solid in situ. The phase diagram of
the system has
(a) five invariant points, two equilibria involving three phases and two equilibria
involving two phases
(b) three invariant points, two equilibria involving three phases and three equilibria
involving two phases
(c) five invariant points, two equilibria involving three phases and three equilibria
involving two phases
(d) three invariant points, three equilibria involving three phases and two equilibria
involving two phases
40. 𝐇𝟐 and 𝐁𝐫𝟐 react to give HBr by the following steps

𝐤𝟐
𝐁𝐫 + 𝐇𝟐 → 𝐇𝐁𝐫 + 𝐇 (𝐬𝐥𝐨𝐰)
𝐤𝟑
𝐇 + 𝐁𝐫𝟐 → 𝐇𝐁𝐫 + 𝐁𝐫 (𝐟𝐚𝐬𝐭)
The probable rate law for the above sequence is:
(a) rate = k 2 [H2 ][Br2 ]1/2 (b) rate = k 2 [H2 ][Br2 ]
(c) rate = k 2 (k)1/2 [H2 ][Br2 ]1/2 (d) rate = k 2 (k)1/2 [H2 ][Br2 ]1/2
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Common data for Q. 41 and Q. 42.

For the opposing reaction,

The forward reaction has values 𝐄𝐚 = 𝟏𝟎𝟎 𝐤𝐉 𝐦𝐨𝐥−𝟏 and 𝐀 = 𝟏. 𝟎 × 𝟏𝟎𝟏𝟎 𝐌−𝟏 𝐬 −𝟏 .
The equilibrium concentration of A, B, C and D are 1.0 M, 2.0 M, 5.0 M and 4.0 M
respectively, at 700 K.
41. The values of 𝐤 𝟏 and 𝐤 −𝟏 , respectively, at this temperature are
(a) 20 M −1 s −1 and 2.0 M −1 s −1 (b) 345 M −1 s−1 and 34.5 M −1 s −1
(c) 34.5 M −1 s −1 and 3.45 M −1 s −1 (d) 200 M −1 s−1 and 20 M −1 s−1
42. The rate constant (𝐤 𝟏 ) for the forward reaction at 1000 K is:
(a) 5.98 × 104 M −1 min−1 (b) 5.98 × 102 M −1 s−1
(c) 1.00 × 103 M −1 s −1 (d) 5.98 × 104 M −1 s−1
43. For the reaction 𝐍𝟐 (𝐠) + 𝟑𝐇𝟐 (𝐠) ⟶ 𝟐𝐍𝐇𝟑 (𝐠), Compute the entropy change (in
𝐉/𝐊/𝐦𝐨𝐥) for the process and comment on the sign of the property
Species 𝐍𝐇𝟑(𝐠) 𝐍𝟐(𝐠) 𝐇𝟐(𝐠)

𝐒 𝟎 (J/K/mol) 192.3 191.5 130.6

(a) ∆S 0 = −37.65 J/K/mol; negative sign indicates that there is a decrease in the
gaseous species during the reaction
(b) ∆S 0 = −198.7 J/K/mol; negative sign indicates that there is a decrease in the
gaseous species during the reaction.
(c) ∆S 0 = −31.25 J/K/mol; negative sign indicates that there is a decrease in the
gaseous species during the reaction.
(d) ∆S 0 = +31.25 J/K/mol; the positive sign indicates that the reaction is spontaneous.
44. The translational partition function of a hydrogen molecule confined in a 100 mL
flask at 298 K (𝐌𝐨𝐥. 𝐰𝐭. 𝐨𝐟 𝐡𝐲𝐝𝐫𝐨𝐠𝐞𝐧 = 𝟐. 𝟎𝟏𝟔) is:
(a) 2.8 × 1020 (b) 2.8 × 1025 (c) 2.8 × 1026 (d) 2.8 × 1027
𝟎
45. ∆𝐇𝟐𝟗𝟖 for the reaction, 𝐂𝟐 𝐇𝟒 𝐎(𝐠) ⟶ 𝐂𝐇𝟒(𝐠) + 𝐂𝐎(𝐠) , is –16.0 kJ. From the given
data, evaluate the temperature at which ∆𝐇 will be zero.
Substance: 𝐂𝟐 𝐇𝟒 𝐎(𝐠) 𝐂𝐇𝟒(𝐠) 𝐂𝐎(𝐠)
𝐂𝐏 (𝐉/𝐊/𝐦𝐨𝐥) 50 36 30
(a) 1298 K (b) 1000 K (c) 1298 ºC (d) 1100 ºC

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46. At 273 K, 𝐍𝟐 is adsorbed on a mica surface. A plot of 𝟏/𝐕 vs 𝟏/𝐏 (V in 𝐦𝟑 and P in

torr) gives a straight line with a slope equal to 𝟐. 𝟎 × 𝟏𝟎−𝟓 𝐭𝐨𝐫𝐫 𝐦−𝟑 and an
intercept equivalent 𝐕𝐦 equal to 𝟒. 𝟎 × 𝟏𝟎−𝟖 𝐦𝟑 . The adsorption coefficient and the
number of molecules of 𝐍𝟐 forming the mono layer, respectively, are
(a) 1.25 × 1012 torr −1 and 1.075 × 1018 (b) 2.5 × 1012 torr −1 and 1.075 × 1018
(c) 2.5 × 1012 torr −1 and 1.75 × 1018 (d) 1.25 × 1010 torr −1 and 1.075 × 1018
47. For the reaction, 𝟐𝐂𝐥(𝐠) ⟶ 𝐂𝐥𝟐(𝐠) ; the thermodynamics properties:
(a) ∆G, ∆H and ∆S are positive
(b) ∆G, ∆H and ∆S are negative
(c) ∆G and ∆H are negative and ∆S is positive
(d) ∆G is negative and ∆H and ∆S are positive
48. The standard free energies of formation of 𝐇𝟐 𝐒(𝐠) and 𝐂𝐝𝐒(𝐬) at 𝟏𝟎𝟎 ℃ are −𝟒𝟗. 𝟎
𝐤𝐉/𝐦𝐨𝐥 and −𝟏𝟐𝟕. 𝟐 𝐤𝐉/𝐦𝐨𝐥, respectively. Use these data to predict whether 𝐇𝟐(𝐠)
will reduce 𝐂𝐝𝐒(𝐬) to metallic Cd at this temperature
(a) ∆G = −78.2 kJ/mol and H2 reduces CdS
(b) ∆G = −39.1 kJ/mol and H2 reduces CdS
(c) ∆G = 0 kJ/mol and the reaction is at equilibrium
(d) ∆G = +78.2 kJ/mol and the reaction is not feasible
49. From the data of two half-cell reactions:
𝐀𝐠𝐂𝐥(𝐬) + 𝐞− ⟶ 𝐀𝐠(𝐬) + 𝐂𝐥− (𝐚𝐪) 𝐄𝟎 = +𝟎. 𝟐𝟐 𝐕
𝐀𝐠 + (𝐚𝐪) + 𝐞− ⟶ 𝐀𝐠(𝐬) 𝐄𝟎 = +𝟎. 𝟖𝟎 𝐕
the solubility product of AgCl at 298 K, is calculated to be
(a) 1.5 × 10−10 (b) 2.1 × 10−7 (c) 3.0 × 10−3 (d) 1.2 × 10−5
50. For the energy level (𝟐 𝐡𝟐 ⁄𝐦𝐚𝟐 ) the probability for a particle of mass ‘m’ over the
length ‘a’ of a one-dimensional box is depicted by

(a) (b)

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(c) (d)

51. Among the following complexes the 18-electron rule is not followed in
I II III IV
[(𝐂𝟔 𝐇𝟔 )𝟐 𝐂𝐫] [𝐇𝐌𝐧(𝐂𝐎)𝟓 ] [(𝐂𝐇𝟑 𝐂𝐎)𝐑𝐡(𝐂𝐎)𝐈𝟑 ]− [𝐂𝐩𝐅𝐞(𝐂𝐎)𝟐 (𝐂𝐇𝟑 )]
(a) III only (b) II and III (c) I and IV (d) II only
52. The incorrect statement regarding the Fischer-type metal carbene complexes is that
(a) carbene acts as a σ donor and π acceptor
(b) all atoms directly connected to carbene C atom are coplanar
(c) the bond between the metal and the carbene C atom has partial double bond character
(d) the carbene C atom is nucleophilic
53. The xenon compounds that are iso-structural with 𝐈𝐁𝐫𝟐− and 𝐁𝐫𝐎−
𝟑 respectively are

(a) linear XeF2 and pyramidal XeO3 (b) bent XeF2 and pyramidal XeO3
(c) bent XeF2 and planar XeO3 (d) linear XeF2 and tetrahedral XeO3
54. The reagents needed for an efficient synthesis of borazine are
(a) NH4 Cl and BCl3 (b) NH4 Cl with NaBH4 on ∆
(c) NH3 and NaBH4 (d) NH3 and BCl3
55. The number of manganese ions in tetrahedral and octahedral sites, respectively in
𝐌𝐧𝟑 𝐎𝟒 are
(a) one Mn2+ and two Mn3+ (b) one Mn3+ and two Mn2+
(c) two Mn3+ and one Mn2+ (d) two Mn2+ and one Mn3+
56. Gold crystallizes in face-centered-cubic lattice. The atomic weight and density of
gold are 196.97 and 19.4 g/𝐜𝐦𝟑 respectively. The length of the unit cell is
(a) 2.563 Å (b) 3.230 Å (c) 4.070 Å (d) 8.140 Å
57. Solid 𝐂𝐨𝟐 (𝐂𝐎)𝟖 shows infrared CO stretching bands at 1857, 1886, 2001, 2031, 2044,
2059, 2071 and 2112 𝐜𝐦−𝟏 . When 𝐂𝐨𝟐 (𝐂𝐎)𝟖 is dissolved in hexane, the carbonyl
bands at 1857 and 1886 𝐜𝐦−𝟏 disappear. These changes in the infrared spectrum in
hexane are due to.
(a) Loss of terminal CO
(b) Structural change of Co2 (CO)8 involving conversion of terminal CO to bridging CO

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(c) Dissociation of Co2 (CO)8 to Co(CO)4

(d) Structural changes of Co2 (CO)8, involving conversion of bridging CO to terminal CO
58. Match the silicate minerals (column I) with their compositions (column II) and
order of hardness (column III)
I II III
P talc U 𝐊𝐀𝐥𝟑 𝐒𝐢𝟑 𝐎𝟏𝟎 (𝐎𝐇)𝟐 X high
Q muscovite V 𝐌𝐠 𝟑 𝐒𝐢𝟒 𝐎𝟏𝟎 (𝐎𝐇)𝟐 Y low
R margarite W 𝐂𝐚𝐀𝐥𝟒 𝐒𝐢𝟐 𝐎𝟏𝟎 (𝐎𝐇)𝟐 Z intermediate

(a) P-V-Y ; Q-U-Z ; R-W-X (b) P-U-X ; Q-V-Z ; R-W-Y

(c) P-W-X ; Q-V-Y ; R-U-Z (d) P-V-Z ; Q-U-Y ; R-W-X
59. The structure of 𝐏𝟒 𝐍𝟒 𝐂𝐥𝟖 is puckered whereas that of 𝐏𝟒 𝐍𝟒 𝐅𝟖 is planar because
(a) F is more electronegative than Cl
(b) F is smaller in size than that of Cl
(c) F is more polarizable than Cl
(d) Extent of π −electron delocalization is more in P4 N4 Cl6 than in P4 N4 F6.
60. The correct order of addition of 𝐍𝐇𝟑 , pyridine (py) and 𝐁𝐫 − to [𝐏𝐭𝐂𝐥𝟒 ]𝟐− to obtain

(a) py, Br − and NH3 (b) Br − , py and NH3

(c) NH3 , py and Br − (d) NH3 , Br − and py
61. [𝐑𝐮(𝐂𝟐 𝐇𝟓 )𝐂𝐥(𝐏𝐏𝐡𝟑 )𝟑 ] is stable only under a pressure of ethene because
(a) it is a 16-electron complex
(b) it forms an 18-electron adduct with ethene
(c) one of the decomposition products is ethene
(d) it prevents α–elimination of ethene
62. The ground state term symbols for 𝐩𝟑 and 𝐝𝟑 electronic configuration respectively,
are
(a) 4S and 4F (b) 4D and 4F (c) 1D and 4F (d) 4S and 2G
63. The “styx” code for diborane is
(a) 2020 (b) 2200 (c) 2002 (d) 0220
64. [𝐂𝐨𝐂𝐥(𝐍𝐇𝟑 )𝟓 ]𝟑+ + [𝐂𝐫(𝐇𝟐 𝐎)𝟔 ]𝟐+ ⟶ [𝐂𝐨(𝐇𝟐 𝐎)(𝐍𝐇𝟑 )𝟓 ]𝟐− + [𝐂𝐫𝐂𝐥(𝐇𝟐 𝐎)𝟓 ]𝟑+

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The correct statement regarding the above reaction is that

(a) it follows outer-sphere mechanism
(b) it follows inner-sphere mechanism with NH3 acting as the bridging ligand
(c) it follows inner-sphere mechanism with Cl− acting as the bridging ligand
(d) it is not an electron-transfer reaction
65. The percentage transmittance of a transition metal complex at 360 nm and at 𝟐𝟓 ℃
is 𝟐𝟓 % for a 𝟔 × 𝟏𝟎−𝟒 𝐦𝐨𝐥𝐋−𝟏 solution in a 1 cm cell. The molar adsorption
coefficient in the unit of 𝐋 𝐦𝐨𝐥−𝟏 𝐜𝐦−𝟏 is:
(a) ~1.0 × 10−3 (b) ~1.0 × 103 (c) ~2.0 × 103 (d) ~1.0 × 104
66. The bond order of the metal-metal bonds in [𝐑𝐞𝟐 𝐂𝐥𝟖 ]𝟐− , [𝐑𝐞𝟐 𝐂𝐥𝟔 (𝐏(𝐂𝟐 𝐇𝟓 )𝟑 )𝟐 ] and
[𝐑𝐞𝟐 𝐂𝐥𝟒 𝐏(𝐂𝟐 𝐇𝟓 𝐏𝐡𝟐 )𝟒 ] respectively are
(a) 4, 4 and 3 (b) 3, 4 and 4 (c) 4, 2 and 3 (d) 2, 3 and 4
67.

(I) (II)

Statement : solvolysis of tosylates (I) and (II) shown above, in acetic acid yield
the corresponding acetates.
Reason : Due to neighbouring group participation(NGP) of the bridge
phenonium ion, achiral intermediates are formed in both cases of
(I) and (II).
Assertion : Tosylate (I) gives an acetate with retention of configuration and
tosylate (II) gives a racemic mixture of acetates.
(a) both R and A are correct (b) both R and A are wrong
(c) R is correct but A is wrong (d) R is wrong but A is correct
68. Statement : Cyclopentadiene can potentially undergo Diels-Alder reaction
(𝟒𝛑 + 𝟐𝛑) and 𝟐𝛑 + 𝟐𝛑 cycloaddition reactions with ketenes.
However, it reacts to give stereospecifically only one product.
Reason : Due to sp hybridisation of the ketene carbon 𝟐𝛑𝐬 + 𝟐𝛑𝐚
cycloaddition is feasible and thermally this reaction is symmetry
allowed.
Assertion : Ketenes undergo only 𝟐𝛑 + 𝟐𝛑 cycloaddition reaction with 1, 3-
dienes.

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(a) both R and A are correct (b) both R and A are wrong
(c) R is correct but A is wrong (d) R is wrong but A is correct
69. Statement : 1,3-Dichloroallene is optically active and the enantiomers are
resolvable.
Reason : Optical activity is due to the presence of a chiral center in the
molecule.
Assertion : The enantiomers are resolvable because interconversion of
enantiomers is possible only if there is a free rotation about C=C
bonds, which is absent.
(a) both R and A are correct (b) both R and A are wrong
(c) R is correct but A is wrong (d) R is wrong but A is correct
70. Statement : At 273 K, the fugacities (in atm) of 𝐍𝟐 are 97.03 and 1839 at the
experimental pressures (atm) of 100 and 1000, respectively.
Reason : At 1000 atm, the system is above the critical temperature and
pressure.
Assertion : The contribution of the repulsive forces is more dominant at 1000
atm.
(a) both R and A are correct (b) both R and A are wrong
(c) R is correct but A is wrong (d) R is wrong but A is correct
71. Statement : for the equilibrium, 𝐀𝐠 𝟐 𝐂𝐎𝟑 (𝐬) ↔ 𝐀𝐠 𝟐 𝐎(𝐬) + 𝐂𝐎𝟐 (𝐠). A plot of ln
𝐊 𝐩 vs 1/T gives a linear relationship with a positive slope.
Reason : The reaction is exothermic.
Assertion : The free energy change for the reaction is more negative at higher
temperatures.
(a) both R and A are correct (b) both R and A are wrong
(c) R is correct but A is wrong (d) R is wrong but A is correct
72. Statement : The potential for the cell, 𝐏𝐭|𝐇𝟐 (𝟏 𝐚𝐭𝐦)|𝐇𝐂𝐥(𝐦)|𝐀𝐠𝐂𝐥(𝐬)|𝐀𝐠(𝐬)
decreases as the concentration of HCl is increased.
Reason : The mean ionic activity coefficient decreases with increase in HCl
concentration.
Assertion : In a plot of E vs [HCl], the intercept at the potential axis is equal
to the standard reduction potential of the hydrogen electrode.
(a) both R and A are correct (b) both R and A are wrong

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(c) R is correct but A is wrong (d) R is wrong but A is correct

73. Statement : Oxygen is preferred to air for welding metals using acetylene gas.
Reason : With air, metal nitrides are formed resulting in poor welding.
Assertion : With air, inert nitrogen dissipates the heat of combustion and
hence, the maximum temperature attained is less than that with
oxygen.
(a) both R and A are correct (b) both R and A are wrong
(c) R is correct but A is wrong (d) R is wrong but A is correct
74. Among the following, the Newmann projections of meso-2, 3-butanediol are

(a) (b) (c) (d)

75. The correct description of the following two reactions is that

(a) Both P and Q undergo α −cleavage reaction

(b) P undergoes only Norrish type II reaction whereas Q undergoes only Norrish type I
reaction.
(c) Q gives P by photochemical chair to chair interconversion of the cyclohexane Ring
(d) Both P and Q undergo Norrish type I reaction, but only Q gives S through this
mechanism.
76. A 10.0 g mixture of n-butane and 2-butene was treated with bromine in 𝐂𝐂𝐥𝟒 and it
consumed 8.0 g of bromine (𝐀𝐭𝐨𝐦𝐢𝐜 𝐰𝐭 = 𝟖𝟎). Another 10.0 g of the same mixture
was hydrogenated to get n-butane only. The weight of 2-butene in the original
mixture and the gain in the weight of the mixture after hydrogenation, respectively
are
(a) 2.8 g and 0.1 g (b) 5.6 g and 0.4 g (c) 7.2 g and 0.8 g (d) 8.0 g and 1.0 g
77. 𝐏𝐲𝐫𝐫𝐨𝐥𝐞 + 𝐏𝐡𝐌𝐠𝐁𝐫 ⟶ 𝐄 + 𝐅
𝐄 + 𝐌𝐞𝐂𝐥 ⟶ 𝐆 + 𝐇
𝐅 + 𝐌𝐞𝐂𝐥 ⟶ 𝐧𝐨 𝐫𝐞𝐚𝐜𝐭𝐢𝐨𝐧 𝐰𝐢𝐭𝐡𝐨𝐮𝐭 𝐜𝐚𝐭𝐚𝐥𝐲𝐬𝐭
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1 2 3 4 5 6 7
The structure of products E–H, respectively are
(E) (F) (G) (H) (E) (F) (G) (H)
(a) (3) ; (2) ; (6) ; (7) (b) (4) ; (5) ; (6) ; (1)
(c) (3) ; (4) ; (5) ; (2) (d) (3) ; (2) ; (4) ; (5)
78. Regarding the saponification of M and N shown below, the correct statement is that

M N
(a) M reacts faster than N because the transition state is less crowded for M than for N
(b) M reacts slower than N because the transition state is more crowded for M than for N
(c) N and M react at the same rate because of formation of tetrahedral intermediate in
both cases
(d) N reacts slower than M because of its greater thermodynamic stability
79. Reactant P labelled with *C (labelled carbon marked with a star) rearranged to
product Q on heating. The structure of reactant P is

(a) (b) (c) (d)

80. 𝐑𝐂𝐇 𝐂𝐎𝐑 + 𝐑′ 𝐗 → [(𝐂𝐇𝟑 )𝟐 𝐂𝐇]𝟐 𝐍𝐋𝐢

𝟐 𝐏+𝐐
In the above reaction, X is a halogen and the products P and Q are
(I) R′ N[CH(CH3 )2 ]2 (II) RCH(R′ )COR

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(III) (IV)

(a) I and II (b) II and III (c) III and IV (d) I and IV
81. Among the halobenzenes, the one that undergoes electrophilic aromatic substitution
most readily and the reason for its higher reactivity are
(a) fluorobenzene; the benzenonium ion intermediate is stablished by 2p (F), 2p (C)
overlap which is most efficient
(b) chlorobenzene; very high electron affinity of chlorine considerably lowers the energy
of activation of the reaction
(c) bromobenzene; high polarising power of the halogen atom helps in effective
stabilisation of the benzenonium ion intermediate
(d) iodobenzene; iodine atom has the lowest electronegativity and hence electron density
of the phenyl ring is least disturbed
82. Among the carboxylic acids shown below, the ones that exhibit stereoisomerism an
also form cyclic anhydrides on heating are
(I) HOOCCH(CH3 )CH2 CH2 COOH (II) HOOCCH(𝑖 C3 H7 )COOH
(III) HOOCCH(C2 H5 )CH2 COOH (IV) HOOCC(CH3 )(C2 H3 )COOH
(a) (I) and (II) (b) (I) and (III) (c) (II) and (III) (d) (II) and (IV)
83. The reactants that lead to products (X) and (Y) on ozonolysis are

HCHO
X Y

I II III IV
(a) (I) and (IV) (b) (I) and (III) (c) (II) and (III) (d) (II) and (IV)

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84.

On the basis of Woodward-Fieser rules, the dienes that have 𝛌𝐦𝐚𝐱 values in the
range 268-273 nm are
(a) P and Q (b) P and R (c) Q and R (d) Q and S
85.

The correct statements with respect to the above pair of reactions are that
I. The reactions are stereospecific
II. (X) is erythro and (Y) is threo isomer
III. (X) is threo and (Y) is erythro isomer
IV. Each of (P) and (Q) gives a mixture of (X) and (Y)
(a) (I) and (II) (b) (I) and (III) (c) (I) and (IV) (d) (II) and (IV)
86.

The above reaction is an example of

(a) nucleophilic substitution of addition-elimination mechanism
(b) electrophilic substitution by addition-elimination mechanism
(c) radical substitution reaction
(d) nucleophilic substitution involving benzyne intermediate
87. Diols (I-IV) which react with 𝐂𝐫𝐎𝟑 in aqueous 𝐇𝟐 𝐒𝐎𝟒 and yield products that readii
undergo decarboxylation on heating, are

I II III IV

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(a) (I) and (II) (b) (II) and (III) (c) (II) and (IV) (d) (I) and (IV)
88. Reactant P gives products Q and/or R.

(P) (Q) (R)

The possible reagents are:
Na/liq.𝐍𝐇𝟑 𝐇𝟐 /Pd-𝐂𝐚𝐂𝐎𝟑 𝐇𝟐 /Pd/C
I II III
The correct statement with respect to the conversion is:
(a) Q is obtained on treatment with reagent (I)
(b) R and Q are obtained on treatment with reagent (III)
(c) R is obtained on treatment with reagent (I)
(d) R is obtained on treatment with reagent (II)
89. The product obtained in the thermal reaction of cyclopentadiene with maleic
anhydride is

(a) (b) (c) (d)

90. Two alkenes, X (91% yield) and Y (9% yield) are formed when the following is
heated.

The structures of X and Y, respectively are

(a) (b)

(c) (d)

Answer Key
Q.No Ans Q.No Ans Q.No Ans Q.No Ans
1. b 26. a 51. a 76. **
2. a 27. c 52. d 77. a

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3. c 28. a 53. a 78. b

4. d 29. a 54. b 79. c
5. a 30. d 55. a 80. b
6. a 31. c 56. c 81. a
7. c 32. a 57. d 82. b
8. a 33. b 58. a 83. b
9. d 34. b 59. b 84. d
10. c 35. a 60. a 85. a
11. a 36. a 61. a 86. d
12. a 37. b 62. a 87. c
13. d 38. a 63. c 88. c
14. d 39. c 64. c 89. b
15. a 40. c 65. b 90. c
16. b 41. b 66. a
17. b 42. d 67. d
18. c 43. b 68. a
19. c 44. c 69. d
20. a 45. a 70. a
21. c 46. a 71. c
22. b 47. b 72. a
23. a 48. d 73. **
24. a 49. a 74. a
25. c 50. a 75. b

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