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.
(a) 
(b) 
(c) 
(d) 
48. The correct structure of tribromooctaoxide is
(a) 
(b)
(c) 
(d) 
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.
(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.
(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.
(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
61. The biodegradable polymer is:
(1) Nylon-6,6 (2) Nylon-2-Nylon 6
(3) Nylon-6 (4) Buna-S
62. pH of a saturated solution of Ca(OH)2 is 9. The solubility product (Ksp) of Ca(OH)2 is:
(1) 0.5 × 10–15 (2) 0.25 × 10–10
(3) 0.125 × 10–15 (4) 0.5 × 10–10
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