Chemical Kinetics – Online Test

1. Which of the following statement is not correct about the order of a reaction –

 
 
 
 

2. A first order reaction is 50% completed in 1.26 x 1014 How much time would it take for 100 % completion?

 
 
 
 

3. The role of a catalyst is to change –

 
 
 
 

4. Activation energy of a chemical reaction can be determined by –

 
 
 
 

5. The time required for 100% completion of a zero order reaction is –

 
 
 
 

6.  A reaction involving two different reactants can never be –

 
 
 
 

7. Which of these does not influence the rate of reaction ?

 
 
 
 

8. Consider a reaction, aA + bB —> cC

When concentration of both the reactants A and B is doubled, the rate increases by eight times. However, when the concentration of A is doubled kepping the concentration of B is fixed, the rate is doubled. The overall order of reaction is –

 
 
 
 

9. A reaction having equal energies of activation for forward and reverse has –

 
 
 
 

10. The rate constant and rate of reaction are same for –

 
 
 
 

11. Half life of a first order reaction is 4 s and the initial concentration of the reactants is 0.12 m. The concentration of the reactant left after 16s is –

 
 
 
 

12. How enzymes increases the rate of reactions –

 
 
 
 

13. The rate constant of the reaction A —> B is 0.6 x 10-3 mole per second. If the concentration of A is 5M then concentration of B after 20 minutes is –

 
 
 
 

14. The experimental data for the reaction 2A + B2 —> 2AB is

Exp.               [A]                         [B2]           Rate (M s-1)

 1                    50                           0.50             1.6 x 10-4

 2                   50                           0.50             3.2 x 10-4

 3                   00                           1.00              3.2 x 10-4

The rate equation for the above data is –

 
 
 
 

15. A reaction is 50% completed in 2 hours and 75% completed in 4 hours. The order of reaction is –

 
 
 
 

16. In the presence of catalyst, the heat evolved or absorbed during the reaction –

 
 
 
 

17. In any Unimolecular reaction –

 
 
 
 

18. Which of the following statement is incorrect –

 
 
 
 

19. In the hydrolysis of an organic chloride in presence of large excess of water,

                      RCl + H2O —> ROH + HCl

 
 
 
 

20. The activation energy for a reaction at the temperature T K was found to be 2.303 RT J/mol. The ratio of the rate constant to Arrhenius factor is –

 
 
 
 

21. Consider the reaction –

           2A + B —> P

 When concentration of B alone was doubled, the half – life did not change. When the concentration of A alone was doubled, the rate increased by two times. The unit of rate constant for this reaction is –

 
 
 
 

22. Rate of reaction can be expressed by Arrehenius equation –

              k = Ae –E/RT

What does the E represents?

 
 
 
 

23. For the first order reaction –

A —> P

The concentration of a changes from 0.1M to 0.025M in 40 minutes. The rate of reaction when the concentration of A  is 001 M is –

 
 
 
 

24. For equation

aA —> xP

when [A] = 2.2mM, the rate was found to be 2.4 mM s-1. On reducing concentration of A to half, the rate changes to 0.6 mM s-1. The order of reaction with respect to A is –

 

 
 
 
 

25. The rate constant of a raection is 0.69 x 10-2 min-1 and the initial concentration is 0.2 mol/L. The half life period is –

 

 

 

            

 
 
 
 

Question 1 of 25

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