Important Questions of Chemical Kinetics Chemistry | Zigya

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

Advertisement
41.

Acid catalysed hydrolysis of ethyl acetate follows a pseudo-first order kinetics with respect to ester. If the reaction is carried out with large excess of ester, the order with respect to ester will be

  • 1.5

  • 0

  • 0.5

  • 1


42.

The half-life for decay of 14C by β-emission is 5730 yr. The fraction of 14C decays, in a sample that is 22920 yr old, would be

  • 18

  • 116

  • 78

  • 1516


43.

A piece of wood from an archaeological sample has 5.0 counts min-1 per gram of C-14, while a fresh sample of wood has a count of 15.0 min-1g-1. If half-life of C-14 is 5770 yr, the age of the archaeological sample is

  • 8,500 yr

  • 9,200 yr

  • 10,000 yr

  • 11,000 yr


44.

Consider the following reaction for 2NO2(g) + F2(g) → 2NO2Fg). The expression for the rate of reaction in terms of the rate of change of partial pressure of reactant and product is/are

  • rate = -12dpNO2dt

  • rate = 12dpNO2dt

  • rate = -12dpNO2Fdt

  • rate = 12dp(NO2F)dt


Advertisement

 Multiple Choice QuestionsShort Answer Type

45.

The bacterial growth follows the rate law, dNdt = kN where k is a constant and 'N' is the dt number of bacteria cell at any time. If the population of bacteria (number of cell) is doubled in 5 min find the time in which the population will be eight times of the initial one?


 Multiple Choice QuestionsMultiple Choice Questions

46.

For the reaction, 2NO2+ F2 2NO2F, following mechanism has been provided. 

NO2+ F2 slow NO2F + FNO2+ F2 Fast NO2F 

Thus, rate expression of the above reaction can be written as

  • r =k [NO2]2[F2]

  • r= k [NO2] [F2]

  • r= k [NO2]

  • r= k [F2]


47.

For a reaction,  I-+ OCl-  IO- + Cl an aqueous medium, the rate of reaction is given by:

                     d[IO-]dt= k [I-] [OCl-][OH]

The overall order of reaction is

  • -1

  • 0

  • 1

  • 2


48.

Reaction between compounds (A) and (B) occurs as follows

A (g) + 2B (g) → 2C (g)

Following results were obtained

(1) Exp. No. (2) Initial concentration of [A] mol L-1 (3) Initial concentration of [B] mol L-1 (4) Initial  rate of formation of [C] mol L-1 s-1
1. 0.30 0.30 0.10
2. 0.30 0.60 0.40
3. 0.60 0.30 0.20

The correct rate- law for the said reaction is (r and k rate and rate constant respectively)

  • r = k[A]2B

  • r = k[A][B]2

  • r = k[A][B]

  • r = k[A]2[B]2


Advertisement
49.

In the reaction 2NO2 k2k1 N2O4; the rate of disappearance of NO2 is equal to

  • 2k1k2 [NO2]2

  • 2k1[NO2]2 - 2k2[N2O4]

  • 2k2[NO2]2 - k2[N2O4]

  • (2k1 - k2)[NO2]


50.

The rate constant for the raection 2N2O5 → 4NO2 + O2 is 3.0 × 10-5 s-1. If rate is 2.40 × 10-5, then concentration of N2O5 (in mol/L) is

  • 1.4

  • 1.2

  • 0.04

  • 0.8


Advertisement