Chemical Kinetics Surface Chemistry Test Online MCQs

1. Which of the following is not a green house gas?

2. Which of the following graphs represent relation between initial concentration of reactants and half-life for third order reaction?    

(a) 

(b) 

(c) 

(d) 

3. for a first order reaction, to obtain a positive slope, we need to plot {where [A] is the concentration of reactant A}

4. For the reaction, 2N₂O₅ → 4NO₂ + O₂ the rate of reaction is:

5. The rate constant of first order reaction is 3 x 10⁻⁶ per second. The initial concentration is 0.10 M. The initial rate is:

6. Which of the following statement is true for the reaction, H₂ + Br₂ → 2HBr The rate law is dx/dt = k[H₂][Br₂]^1/2:

7. The first order rate constant for a certain reaction increases from 1.667 x 10⁻⁶ s⁻¹ at 727°C to 1.667 x 10⁻⁴ s⁻¹ at 1571°C. The rate constant at 1150°C, assuming constancy of activation energy over the given temperature range is [Given: log 19.9 = 1.299]

8. The rate constant k, for the reaction N₂O₅(g) → 2NO₂(g)+1/2 O₂(g) is 1.3 x 10⁻²s⁻¹. Which equation given below describes the change of [N₂O₅] with time? [N₂O₅]₀ and [N₂O₅]_t correspond to concentration of N₂O₅ initially and at time t.

(a) [N₂O₅]_t= [N₂O₅]₀ + kt

(b) [N₂O₅]₀ = [N₂O₅]_t e^kt

(c) Log [N₂O₅]_t = log [N₂O₅]₀ + kt

(d) In [N₂P₅]₀/[N₂P₅] _t = kt

9. For reaction aA → xP, when [A] = 2.2 mM, the rate was found to be 2.4 mMs⁻. On reducing concentration of A to half, the rate changes to 0.6  mMs⁻. The order of reaction with respect to A is:

10. Lyophilic colloids are stable due to:

11. The colloid is:

12. The size of colloidal particle is

13. The movement of colloidal particles, under applied electric current is known as:

14. The physical adsorption of gases on the solid surface is due to:

15. The colligative property is not represented by: