You are currently viewing NEET Chemistry Exam 2019 year Question Papers and Answer keys

NEET Chemistry Exam 2019 year Question Papers and Answer keys

46. The number of sigma (σ) and π(π) bonds in pent-2-en-4-yne is-

(1) 10 σ bonds and 3π bonds

(2) 8 σ bonds and 5π bonds

(3) 11 σ bonds and 2π bonds

(4) 13 σ bonds and no π bonds

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47.

Chemistry formula

(a) Chemistry formula                      (b) Chemistry formula

(c) Chemistry formula                      (d) Chemistry formula

48. The correct structure of tribromooctaoxide is

(a) Chemistry formula                                (b)Chemistry formula

(c) Chemistry formula                              (d) Chemistry formula

49. 4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is

(1) 5f > 6p > 5p > 4d                 (2) 6p > 5f > 5p > 4d

(3) 6p > 5f > 4d > 5p                 (4) 5f > 6p > 4d > 5p

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50.

Chemistry formula

(1) (a) and (b) only                    (2) (a), (b) and (c)

(3) (a), (c) and (d)                     (4) (a) and (d) only

51. Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar. The work done by the gas is

(Given that 1 L bar = 100 J)

(1) –30 J                (2) 5 kJ

(3) 25 J                  (4) 30 J

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52. Among the following, the one that is not a green house gas is

(1) Nitrous oxide             (2) Methane

(3) Ozone                        (4) Sulphur dioxide

53.

Chemistry formula

(1) – 46.32 kJ mol–1                  (2) – 23.16 kJ mol–1

(3) 46.32 kJ mol–1                     (4) 23.16 kJ mol–1

54. Enzymes that utilize ATP in phosphate transfer require an alkaline earth metal (M) as the cofactor. M is :

(1) Be                    (2) Mg

(3) Ca                    (4) Sr

55.

Chemistry formula

(1) Na/liquid NH3                       (2) H2, Pd/C, quinoline

(3) Zn/HCl                                 (4) Hg2+/H+, H2O

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56. Which is the correct thermal stability order for H2E

(E = O, S, Se, Te and Po)?

(1) H2S < H2O < H2Se < H2Te < H2Po

(2) H2O < H2S < H2Se < H2Te < H2Po

(3) H2Po < H2Te < H2Se < H2S < H2O

(4) H2Se < H2Te < H2Po < H2O < H2S

57. Which of the following is incorrect statement?

(1) PbF4 is covalent in nature

(2) SiCl4 is easily hydrolysed

(3) GeX4 (X = F, Cl, Br, I) is more stable thanGeX2

(4) SnF4 is ionic in nature

58. Match the following :

(a) Pure nitrogen              (i) Chlorine

(b) Haber process            (ii) Sulphuric acid

(c) Contact process          (iii)Ammonia

(d) Deacon’s process       (iv) Sodium azide or Barium azide

Which of the following is the correct option?

 (1) (a) – (i) (b) – (ii)       (c) – (iii)       (d) – (iv)

(2) (a) – (ii) (b) – (iv)      (c) – (i)         (d) – (iii)

(3) (a) – (iii)           (b) – (iv)      (c) – (ii)        (d) – (i)

(4) (a) – (iv)           (b) – (iii)      (c) – (ii)        (d) – (i)

59. Which of the following diatomic molecular species has only π bonds according to Molecular Orbital Theory?

(1) O2

(2) N2

(3) C2

(4) Be2

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60. For the second period elements the correct increasing order of first ionisation enthalpy is:

(1) Li < Be < B < C < N < O < F < Ne

(2) Li < B < Be < C < O < N < F < Ne

(3) Li < B < Be < C < N < O < F < Ne

(4) Li < Be < B < C < O < N < F < Ne