Physical Chemistry MCQ with Answers

Physical Chemistry MCQ with Answers

201) On addition of positive catalyst to a reaction system undergoing reversible reaction:

Answer is:

Both K_f and K_b change by same fraction

Explanation:

On addition of catalyst, K_eq does not change.

202) The equilibrium constant of a reaction is 20. At eqilibrium, the rate constant of forward reaction is 10. The rate constant for backward reaction is:

Answer is:

0.5

Explanation:

K_c = K_f⁄K_b

203) Molar concentration of 96 gm of O₂ contained in 2 litre vessel is:

Answer is:

1.5 mol⁄L

Explanation:

Molar concentration = Number of moles ⁄ Vol(L)

204) 1 mol of ethyl alcohol was treated with 1 mol of acetic acid at 25^oC. Two third of the acid changes into ester at equilibrium. The equilibrium constant for the reaction of hydrolysis of ester is:

Answer is:

4

205) At 250^oC, the vapour density of PCl₅ is 100. Calculate the degree of dissociation at this temperature:

Answer is:

0.04

38
39
40
41
42
43
44