GATE Exam 2022 Chemistry (CY) Question Paper With Answer Key


CY: Chemistry

GA-General Aptitude

Q.1 – Q.5 Carry ONE mark each.

1. Inhaling the smoke from a burning _________ could _________ you quickly.

(A)  tire / tier

(B)  tire / tyre

(C)  tyre / tire

(D)  tyre / tier

Answer: (C)

2. A sphere of radius r cm is packed in a box of cubical shape.

What should be the minimum volume (in cm3) of the box that can enclose the sphere?

(A)  r3/8

(B)  r3

(C)  2r3

(D)  8r3

Answer: (D)

3. Pipes P and Q can fill a storage tank in full with water in 10 and 6 minutes, respectively. Pipe R draws the water out from the storage tank at a rate of 34 litres per minute. P, Q and R operate at a constant rate.

If it takes one hour to completely empty a full storage tank with all the pipes operating simultaneously, what is the capacity of the storage tank (in litres)?

(A)  26.8

(B)  60.0

(C)  120.0

(D)  127.5

Answer: (C)

4. Six persons P, Q, R, S, T and U are sitting around a circular table facing the center not necessarily in the same order. Consider the following statements:

• P sits next to S and T.

• Q sits diametrically opposite to P.

• The shortest distance between S and R is equal to the shortest distance between T and U.

Based on the above statements, Q is a neighbor of

(A)  U and S

(B)  R and T

(C)  R and U

(D)  P and S

Answer: (C)

5. A building has several rooms and doors as shown in the top view of the building given below. The doors are closed initially.

What is the minimum number of doors that need to be opened in order to go from the point P to the point Q?

(A)  4

(B)  3

(C)  2

(D)  1

Answer: (C)

Q.6 – Q. 10 Carry TWO marks each.

6. Rice, a versatile and inexpensive source of carbohydrate, is a critical component of diet worldwide. Climate change, causing extreme weather, poses a threat to sustained availability of rice. Scientists are working on developing Green Super Rice (GSR), which is resilient under extreme weather conditions yet gives higher yields sustainably.

Which one of the following is the CORRECT logical inference based on the information given in the above passage?

(A)  GSR is an alternative to regular rice, but it grows only in an extreme weather

(B)  GSR may be used in future in response to adverse effects of climate change

(C)  GSR grows in an extreme weather, but the quantity of produce is lesser than regular rice

(D)  Regular rice will continue to provide good yields even in extreme weather

Answer: (B)

7. A game consists of spinning an arrow around a stationary disk as shown below. When the arrow comes to rest, there are eight equally likely outcomes. It could come to rest in any one of the sectors numbered 1, 2, 3, 4, 5, 6, 7 or 8 as shown. Two such disks are used in a game where their arrows are independently spun. What is the probability that the sum of the numbers on the resulting sectors upon spinning the two disks is equal to 8 after the arrows come to rest?

(A)  1/16

(B)  5/64

(C)  3/32

(D)  7/64

Answer: (D)

8. Consider the following inequalities.

(i) 3p − q< 4

(ii) 3q − p< 12

Which one of the following expressions below satisfies the above two inequalities?

(A)  p + q < 8

(B)  p + q = 8

(C)  8 ≤ p + q < 16

(D)  p + q ≥ 16

Answer: (A)

9. Given below are three statements and four conclusions drawn based on the statements.

Statement 1: Some engineers are writers.

Statement 2: No writer is an actor.

Statement 3: All actors are engineers.

Conclusion I: Some writers are engineers.

Conclusion II: All engineers are actors.

Conclusion III: No actor is a writer.

Conclusion IV: Some actors are writers.

Which one of the following options can be logically inferred?

(A)  Only conclusion I is correct

(B)  Only conclusion II and conclusion III are correct

(C)  Only conclusion I and conclusion III are correct

(D)  Either conclusion III or conclusion IV is correct

Answer: (C)

10. Which one of the following sets of pieces can be assembled to form a square with a single round hole near the center? Pieces cannot overlap.

Answer: (C)


Q.11 – Q.35 Carry ONE mark Each

11. The major product M formed in the following reaction is

Answer: (B)

12. The starting material Y in the following reaction is

Answer: (B)

13. The major product in the given reaction is Q. The mass spectrum of Q shows {[M] = molecular ion peak}

(A) [M], [M+2] and [M+4] with relative intensity of 1:2:1

(B) [M] and [M+2] with relative intensity of 1:1

(C) [M], [M+2] and [M+4] with relative intensity of 1:3:1

(D) [M] and [M+2] with relative intensity of 2:1

Answer: (A)

14. A tripeptide on treatment with PhNCS (pH = 8.0) followed by heating with dilute HCl afforded a cyclic compound M and a dipeptide. The dipeptide on treatment with PhNCS (pH = 8.0) followed by heating with dilute HCl afforded a cyclic compound N and an acyclic compound O. The CORRECT sequence (from N- to C-terminus) of the tripeptide is

(A) glycine-phenylalanine-valine

(B) valine-phenylalanine-glycine

(C) glycine-tyrosine-valine

(D) glycine-phenylalanine-alanine

Answer: (A)

15. The major product M in the following reaction is

Answer: (A)

16. The major product T formed in the following reaction is

Answer: (A)

17. In differential thermal analysis (DTA)

(A) the temperature differences between the sample and reference are measured as a function of temperature

(B) the differences in heat flow into the reference and sample are measured as a function of temperature

(C) the change in the mass of the sample is measured as a function of temperature

(D) the glass transition is observed as a sharp peak

Answer: (A)

18. The vO−O resonance Raman stretching frequency (cm1) of the coordinated dioxygen in oxy-hemoglobin and oxy-hemocyanin appears, respectively, nearly at

(A) 1136 and 744

(B) 1550 and 744

(C) 744 and 1136

(D) 744 and 1550

Answer: (A)

19. The number of metal-metal bond(s), with σ, π, and δ character, present in [Mo2(CH3CO2)4] complex is(are), respectively,

(A) 1, 2, 1

(B) 1, 2, 0

(C) 1, 1, 0

(D) 1, 1, 1

Answer: (A)

20. 1sA and 1sB are the normalized eigenfunctions of two hydrogen atoms HA and HB, respectively. If 𝑆 = ⟨1sA|1sB⟩, the option that is ALWAYS CORRECT is

(A)  S = 1

(B)  S = 0

(C)  S = imaginary constant

(D)  0 ≤ S ≤ 1

Answer: (D)

21. The pure vibrational spectrum of a hypothetical diatomic molecule shows three peaks with the following intensity at three different temperatures.

The CORRECT statement is

(A) Peak I appears at the lowest energy

(B) Peak II appears at the lowest energy

(C) Peak III appears at the lowest energy

(D) Peak I appears at the highest energy

Answer: (C)

22. The point group of SF6 is

(A)  D6h

(B)  Oh

(C)  D6d

(D)  C6v

Answer: (B)

23. A point originally at (1, 3, 5) was subjected to a symmetry operation  that shifted the point to (−1, −3, 5). Subsequently, the point at (−1, −3, 5) was subjected to another symmetry operation  that shifted this point to(−1, −3, −5). The symmetry operators  are, respectively,

Answer: (B)

24. Adsorption of a gas with pressure P on a solid obeys the Langmuir adsorption isotherm. For a fixed fractional coverage, the correct relation between K and P at a fixed temperature is

[K = ka/kb, ka and kb are the rate constants for adsorption and desorption, respectively. Assume non-dissociative adsorption.]

(A)  K ∝ P1/2

(B)  K ∝ P

(C)  K ∝ P1

(D)  K ∝ P1/2

Answer: (C)

25. The temperature dependence of the rate constant for a second-order chemical reaction obeys the Arrhenius equation. The SI unit of the ‘pre-exponential factor’ is

(A)  s1

(B)  m3mol1s1

(C)  mol m3 s1

(D)  (m3 mol1)2 s1

Answer: (B)

26. The CORRECT reagent(s) for the given reaction is(are)

(A)  H2O2, NaOH


(C)  DIBAL-H, then mCPBA

(D)  SO3·pyridine, Me2SO

Answer: (A, B)

27. The CORRECT statement(s) about the 1H NMR spectra of compounds P and Q is (are)

(A) P shows a sharp singlet at δ = 3.70 ppm (for Ha and Hb)

(B) Q shows a sharp singlet at δ = 3.70 ppm (for Ha and Hb)

(C) P shows a AB-quartet centered at δ = 3.63 ppm (for Ha and Hb)

(D) Q shows a AB-quartet centered at δ = 3.63 ppm (for Ha and Hb)

Answer: (A, D)

28. The CORRECT statement(s) about thallium halides is(are)

(A) TlF is highly soluble in water whereas other Tl-halides are sparingly soluble

(B) TlF adopts a distorted NaCl structure

(C) TlI3 is isomorphic with CsI3 and the oxidation state of Tl is +3

(D) Both TlBr and TlCl have CsCl structure

Answer: (A, B, D)

29. The CORRECT statement(s) about the spectral line broadening in atomic spectra is(are)

(A) The collision between atoms causes broadening of the spectral line

(B) Shorter the lifetime of the excited state, the broader is the line width

(C) Doppler broadening is more pronounced as the flame temperature increases

(D) In flame and plasma, the natural line broadening exceeds the collisional line broadening

Answer: (A, B, C)

30. Match the CORRECT option(s) from column A with column B according to the metal centre present in the active site of metalloenzyme.

(A) P-V, Q-III, R-I, S-II

(B) P-IV, Q-II, R-I, S-III

(C) P-II, Q-IV, R-V, S-III

(D) P-V, Q-III, R-II, S-IV

Answer: (A)

31. The CORRECT statement(s) about the following phase diagram for a hypothetical pure substance X is(are)

(A) The molar volume of solid X is less than the molar volume of liquid X

(B) X does not have a normal boiling point

(C) The melting point of X decreases with increase in pressure

(D) On increasing the pressure of the gas isothermally, it is impossible to reach solid phase before reaching liquid phase

Answer: (B, C)

32. The parameter(s) fixed for each system in a canonical ensemble is(are)

(A) temperature

(B) pressure

(C) volume

(D) composition

Answer: (A, C, D)

33. The number of peaks exhibited by T in its broadband proton decoupled 13C NMR spectrum recorded at 25°C in CDCl3 is

Answer: (8 to 8)

34. The diffraction angle (in degree, rounded off to one decimal place) of (321) sets of plane of a metal with atomic radius 0.125 nm, and adopting BCC structure is ______

(Given: the order of reflection is 1 and the wavelength of X-ray is 0.0771 nm)

Answer: (59.0 to 61.0)

35. For the angular momentum operator  and the spherical harmonics Ylm (θ, ϕ),

The value of n is _____

Answer: (5 to 5)

Q.36 – Q.65 Carry TWO marks Each

36. The major product P obtained in the following reaction sequence is

Answer: (A)

37. The major product Q in the given reaction is

Answer: (A)

38. The major product P in the following reaction is

Answer: (A)

39. The major product P in the reaction sequence is

Answer: (A)

40. The major products P and Q in the following reaction sequence are

Answer: (B)

41. The major products M and N in the given reaction sequence are

Answer: (B)

42. Three different crystallographic planes of a unit cell of a metal are given below(solid circles represent atom). The crystal system of the unit cell is

(A) triclinic

(B) monoclinic

(C) tetragonal

(D) orthorhombic

Answer: (D)

43. The number of equivalents of H2S gas released from the active site of rubredoxin,2-iron ferredoxin, and 4-iron ferredoxin when treated with mineral acid, respectively, are

(A) 4, 6, 8

(B) 0, 2, 4

(C) 1, 2, 4

(D) 0, 2, 3

Answer: (B)

44. The number of vS = O stretching vibration band(s) observed in the IR spectrum of the high-spin [Mn(dmso)6]3+ complex (dmso: dimethylsulfoxide) is

(A) only one

(B) two with intensity ratio 1:2

(C) two with intensity ratio 1:1

(D) six with intensity ratio 1:1:1:1:1:1

Answer: (B)


*indicates a radioactive isotope

The rate constants in the given self-exchange electron transfer reactions at acertain temperature follow

(A)  k11> k22> k33

(B)  k22> k11> k33

(C)  k33> k22> k11

(D)  k22> k33> k11

Answer: (B)

46. The CORRECT distribution of the products in the following reaction is

Answer: (C)

47. The addition of K4[Fe(CN)6] to a neutral aqueous solution of the cationic species of a metal produces a brown precipitate that is insoluble in dilute acid. The cationic species is

(A)  Fe3+

(B)  UO22+

(C)  Th4+

(D)  Cu2+

Answer: (D)

48. The electronic spectrum of a Ni(II) octahedral complex shows four d-d bands, labelled as P, Q, R, and S. Match the bands corresponding to the transitions.

(A) P-IV, Q-III, R-II, S-I

(B) P-III, Q-IV, R-II, S-I

(C) P-II, Q-IV, R-I, S-III

(D) P-I, Q-IV, R-II, S-III

Answer: (B)

49. In the following table, the left column represents the rigid-rotor type and the right column shows a set of molecules.

The CORRECT match is

(A) P-1, Q-2, R-3, S-4

(B) P-3, Q-2, R-1, S-4

(C) P-3, Q-5, R-1, S-2

(D) P-5, Q-4, R-3, S-2

Answer: (B)

50. The CORRECT statement regarding the following three normal modes of vibration of SO3 is

(A) (I) and (II) are infrared active while (III) is infrared inactive

(B) (I) is infrared inactive while (II) and (III) are infrared active

(C) (I) and (III) are infrared inactive while (II) is infrared active

(D) None of the modes are infrared active since SO3 has zero dipole moment

Answer: (B)

51. The reaction(s) that yield(s) 3-phenylcyclopentanone as the major product is(are)

Answer: (A, B)

52. The reaction(s) that yield(s) M as the major product is(are)

Answer: (A, B, D)

53. The CORRECT statement(s) regarding B10H14 is (are)

(A) Brønsted acidity of B10H14 is higher than that of B5H9

(B) Structurally B10H14 is a closo-borane

(C) The metal-promoted fusion of B5H8 produces B10H14

(D) Both B10H14 and B10H12(SEt2)2 have the same number of valence electrons

Answer: (A, C, D OR A, C)

54. The CORRECT statement(s) about the Group-I metals is(are)

(A) Reactivity of Group-I metals with water decreases down the group

(B) Among the Group-I metals, Li spontaneously reacts with N2 to give a red-brown layer-structured material

(C) Thermal stability of Group-I metal peroxides increases down the group

(D) All the Group-I metal halide are high-melting colorless crystalline solids

Answer: (B, C, D)

55. The compound(s) that satisfies/satisfy the 18-electron rule is(are)

(Atomic number of Os = 76, Rh = 45, Mo = 42, and Fe = 26)

Answer: (A, D)

56. For three operators  

Answer: (B, D)

57. The difference between the number of Gauche-butane interactions present in P and Q is

Answer: (1 to 1)

58. The calculated magnetic moment (in BM, rounded off to two decimal places) of aCe3+ complex is

Answer: (2.52 to 2.56)

59. The state of the electron in a He+ ion is described by the following normalized wave function,

Here, Rnl and Ylm represent the radial and angular components of the eigenfunctions of He+ ion, respectively, and x is an unknown constant. If the energy of the ion is measured in the above state, the probability (rounded off to two decimal places) of obtaining the energy of−2/9 atomic unit is

Answer: (0.18 to 0.20)

60. A certain wavefunction for the hydrogen-like atom is given by

The number of node(s) in this wave function is

Answer: (2 to 2)

61. EMF of the following cell


at 25 °C and 1 bar is 0.36 V. The value of the mean activity coefficient (rounded off to three decimal places) of CuSO4 at 25 °C and 1 bar is

[Given: Standard electrode potential values at 25 °C for

Cu2+ + 2e→ Cu and

Hg2SO4 + 2e → 2Hg + SO42−

are 0.34 V and 0.62 V, respectively.

Consider: RT/F at 25 °C = 0.0256 V]

Answer: (0.042 to 0.046)

62. The radius of gyration (in nm, rounded off to one decimal place), for three dimensional random coil linear polyethylene of molecular weight 8,40,000 is

[Given: C−C bond length = 0.154 nm]

Answer: (15.2 to 15.6)

63. The activation energy of the elementary gas-phase reaction O3 + NO → NO2 + O2is 10.5 kJ mol1. The value of the standard enthalpy of activation (rounded off to two decimal places in kJ mol1) at 25 °C is

[Given: R is 8.314 J mol1 K1]

Answer: (5.50 to 5.60)

64. In a collection of molecules, each molecule has two non-degenerate energy levels that are separated by 5000 cm1. On measuring the population at a particular temperature, it was found that the ground state population is 10 times that of the upper state. The temperature (in K, rounded off to the nearest integer) of measurement is

[Given: Value of the Boltzmann constant = 0.695 cm1 K1]

Answer: (3100 to 3150)

65. The change in entropy of the surroundings (in J K1, rounded off to two decimal places) to convert 1 mol of super cooled water at 263 K to ice at 263 K at 1 bar is

[Consider : ∆fusH° at 273 K = 6.0 kJ mol1, and the molar heat capacity of water is higher than that of ice by 37.0 J K1 mol1 in the temperature range of 263 K to273 K]

Answer: (21.20 to 21.60)

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