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NCERTCBSE CHEMISTRY CLASS 12 CHAPTERWISE MCQ QUESTIONS

Welcome to your Unit 4: Chemical Kinetics

1. 
The half life period of first order reaction is 1386 seconds. The specific rate constant of the reaction is

2. 
The rate constant of a reaction A → B is 0.6 × 103 mole per second. If the concentration of [A] is 5 M, then what will be concentration of [B] after 20 months?

3. 
For a chemical reaction, X + 2Y → Z, if the rate of appearance of Z is 0.50 moles per litre per hour, then the rate of disappearance of Y is

4. 
What will be the fraction of molecules having energy equal to or greater than activation energy, Ea?

5. 
What type of reaction is this?

6. 
In chemical equation H2 (g) + I2 (g) ⇌ 2HI (g) the equilibrium constant Kp depends on

7. 
If the rate of a reaction is expressed by, rate = A [A]² [B], the order of reaction will be

8. 
Which of the following is affected by catalyst?

9. 
The activation energy of a reaction can be determined from the slope of which of the following graph:

10. 
Mechanism of a hypothetical reaction X2 + Y2 → 2 × Y is given below:


Chemistry MCQs for Class 12 with Answers Chapter 4 Chemical Kinetics 2
(b) X + Y2 → XY + Y (slow)
(c) X + Y → XY (fast)
The overall order of reaction is

11. 
The rate of a reaction is primarily determined by the slowest step. This step is called

12. 
The reaction of high molecularity are rare because

13. 
A reaction in which reactants (R) are converted into products (P) follows second order kinetics. If concentration of R is increased by four times, what will be the increase in the rate of formation of P?

14. 
Which of the following statements about the catalyst is true?

15. 
An endothermic reaction with high activation energy for the forward reaction is given by the diagram.

16. 
For a chemical reaction A→B, it is found that the rate of reaction doubles when the concentration of A is increased four times. The order of reaction is

17. 
The rate of first order reaction is 0.04 mol L-1 s-1 at 10 sec. and 0.03 mol L-1 at 2C seconds after initiation of the reaction. t1/2 of reaction is

18. 
For a reaction taking place in three steps,

19. 
Consider Fig. and mark the correct option

20. 
The order of reaction is decided by

21. 
Half life period of a first order reaction is 10 min. What percentage of the reaction will be completed in 100 min?

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