Chapter 8 – Multiple Choice Questions

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Multiple Choice Questions:

1. The branch of chemistry which deals with the study of reaction rates in known as

(i) Photochemistry

(ii) Chemical kinetics

(iii) Thermodynamics

(iv) Mechanics

 

2. The change in the concentration of reactants or products in a unit time is known as

(i) Rate of reaction

(ii) Rate of constant

(iii) Order

(iv) Molecularity

3. The number of atoms or molecules. Whose concentrations determine the rate of the reaction is called:

(i) Order

(ii) Molecularity

(iii) Rate constant

(iv) Rate of reaction

 

4. Total number of atoms or molecules taking part in chemical reaction is known as

(i) Order

(ii) Molecularity

(iii) Rate constant

(iv) Rate of reactions

 

5. The activation energy of a may be lowered

(i) By rising the temperature

(ii) By lowering the temperature

(iii) By removing the products

(iv) By adding a catalyst

6. If the rate of reaction is independent of the concentration of the reactant the reaction is of

(i) Zero order

(ii) First order

(iii) Second order

(iv) Third order

 

7. Consider the following rate law

Rate = K [A ll B]²

Doubling the concentration of A increase the rate of reaction by a factor of

(i) 2

ii) 3 First order

(iii) 4

(iv) 9

 

8. Doubling the concentration of B increases the rate of reaction by a factor of

(i) 2

(ii) 3

(iii) 4

(iv) 9

 

9. Consider the general reaction

A ———-> B + c

9(a). The rate of reaction can be expressed as

(i) -d [A] / dt

(ii) d [B] / dt

(iii) d [C] / dt

(iv) All of the above

 

10. Those substances which slow clown a reaction are called

(i) Catalysts

(ii) Promoters

(iii) Inhibitors

(iv) None of these

 

11. The rate of reaction is given by

(i) dx / dt

(ii) dx x dt

(iii) dx – dt

(iv) dx + dt

 

12. The graph shows the relation ship between the enthalpy of reaction and activation energy for the reaction is

13. If a reaction between A and B is second order, which of the following is true

A + B ——> C

(i) Rate = K [A]²[B]

(ii) Rate = K [b]²

(iii) Rate = K[A]²

(iv) Rate = K [A] [B]

 

14. Rate of reaction is directly proportional to the:

(i) Volume of products

(ii) Order law

(iii) Relative masses of product

(iv) Relative masses of reactants

 

15. Reaction with high activation energy are:

(i) Slow

(ii) Fast

(iii) Moderate

(iv) Does not take place

 

16. An increase in concentration:

(i) Is related to the number of collision directly

(ii) Is related to the number of collision inversely

(iii) Has no effect on the number of collision

(iv) Depends upon condition

 

17. The minimum energy required for:

(i) Colliding molecules to react is called threshold

(ii) Colliding molecules to react is called activation energy

(iii) Colliding molecules to react is called energy of reaction

(iv) Colliding molecules to react is called bond energy

 

18. Which of the following type of metals make the most efficient catalyst?

(i) Transition metals

(ii) Alkali metals

(iii) Alkaline earth metal

(iv) Non- metals

 

19. Rate of a reaction increase by increasing:

(i) Surface area

(ii) Concentration reaction

(iii) Catalyst

(iv) All of the above

 

20. Powdered zinc is more reactive than the solid zinc because

(i) It has more surface area

(ii) Zinc is more reactive in powder form

(iii) Zinc is a transition metal

(iv) Zinc is an electropositive element

 

21. A + B catalyst———–> C + D

Which of the following statements for the above reaction is correct

(i) The catalyst higher the energy of activation

(ii) Rate = K [C][D]

(iii) Rate is dependent on concentration of A and B

(iv) None of these

 

22. Rate = K[NO|²[O2

If conc. of O 2 is double the rate of reaction will also be:

(i) Increase 4 times

(ii) Double

(iii) Decrease 4 times

( iv) Decrease 1/2 time

 

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