4. CHEMICAL KINETICS Objective
4. CHEMICAL KINETICS
Download 1. In chemical equation H2 (g) + I2 (g) тЗМ┬а2HI (g) the equilibrium constant Kp depends on
(A) total pressure
(B) catalyst used
(C) amount of H2 and I2
(D) temperature
Answer тЗТ (B)
2. If the rate of a reaction is expressed by, rate = k [A]2 [B], the order of reaction will be
(A) 2
(B) 3
(C) 1
(D) 0
Answer тЗТ (B)
3. In a reaction, 2X тЖТ Y, the concentration of X decreases from 0.50 M to 0.38 M in 10 min.What is the rate of reaction in M s-1 during this interval ?
(A) 2 x 10-4
(B) 4x 10-2
(C) 2 x 10-2
(D) 1x 10-2
Answer тЗТ (A)
4. Which of the following is an example of a fractional order reaction ?
(A) NH4NO2 тЖТ N2 + 2H2O
(B) NO + O3 NO2 + O2
(C) 2NO +Br2 тЖТ 2NOBr
(D) CH3CHO тЖТ CH4 + CO
Answer тЗТ (D)
5. The unit of rate constant for the reaction 2H2 + 2NO тЖТ 2H2O + N2 which has rate = K H2] [NO]2, is
(A) mol L-1s-1
(B) s-1
(C) mol-2 L2 5-1
(D) mol L-1
Answer тЗТ (C)
6. The rate constant of a reaction depends upon
(A) temperature of the reaction
(B) extent of the reaction
(C) initial concentration of the reactants
(D) the time of completion of reaction
Answer тЗТ (D)
7. The chemical reaction, 203 тЖТ 302 proceeds as
O3 тЗМ┬а O2 + [O] (fast)
[O] + O3 тЖТ 2O2 (slow)
The rate law expression will be
(A) Rate = k [O] [O3]
(B) Rate = k [O3]2 [O2]-1
(C) Rate = k [O3]2
(D) Rate = k [O2] [O]
Answer тЗТ (B)
8. The unit of rate and rate constant are same for a
(A) zero order reaction
(B) first order reaction
(C) second order reaction
(D) third order reaction
Answer тЗТ (A)
9. For a unimolecular reaction
(A) the order and molecularity of the slowest step are equal to one
(B) molecularity of the reaction can be zero, one or two
(C) molecularity of the reaction can be determined only experimentally
(D) more than one reacting species are involved in one step
Answer тЗТ (A)
10. The order of reaction is decided by
(A) temperature
(B) mechanism of reaction as well as relative concentration of reactants
(C) molecularity
(D) pressure
Answer тЗТ (B)
11. Radioactive disintegration is an example of
(A) zero order reaction
(B) first order reaction
(C) second order reaction
(D) third order reaction
Answer тЗТ (B)
12. The hydrolysis of ethyl acetate :
CH3COOC2H5 + H2O 
CH3COOH + C2H5OH is a reaction of
(A) zero order
(B) pseudo first order
(C) second order
(D) third order
Answer тЗТ (B)
13. Rate of which reaction increases with temperature ?
(A) Exothermic reaction
(B) Endothermic reaction
(C) (A) and (B) both
(D) None of the above
Answer тЗТ (C)
14. The activation energy in a chemical reaction is defined as :
(A) the difference in energies of reactants and products
(B) the sum of energies of reactants and products
(C) the difference in energy of intermediate complex with the average energy of reactants and products
(D) the difference in energy of intermediate complex and the average energy of reactants
Answer тЗТ (D)
15. The temperature dependence of the rate of a chemical reaction can be explained by Arrhenius equation which is
(A) k = Ae Ea/RT
(B) k = Ae -Ea/RT
(C) k = Ae x 
(D) k = Ae x 
Answer тЗТ (B)
16. The role of a catalyst is to change
(A) Gibbs energy of reaction
(B) enthalpy of reaction
(C) activation energy of reaction
(D) equilibrium constant
Answer тЗТ (C)
17. In the presence of a catalyst, the heat evolved or absorbed during the reaction
(A) increases
(B) decreases
(C) may increase or decrease
(D) remains unchanged
Answer тЗТ (D)
18. Rate law for the reaction A + B тЖТ C is found to be Rate = k [A] [B] Concentration of reactant ‘B’ is doubled, keeping the concentration of ‘A’ constant, the value of rate constant will be
(A) the same
(B) doubled
(C) quadrupled
(D) halved
Answer тЗТ (A)
19. The value of rate constant of a pseudo first order reaction
(A) depends on the concentration of reactants present in small amount
(B) depends on the concentration of reactants presents in excess
(C) is independent of the concentration of reactants
(D) depends only on temperature
Answer тЗТ (B)
20. t1/2 for first order reaction is
Answer тЗТ (B)
21. The rate at which a substance reacts, depends upon its
(A) Atomic mass
(B) Equivalent mass
(C) Molecular mass
(D) Active mass
Answer тЗТ (D)
22. For a zero order reaction
(A) t1/2 тИЭ 
(B) t1/2 тИЭ 1/a
(C) t1/2 тИЭ a2
(D) t1/2 тИЭ 
Answer тЗТ (A)
Class 12th Chemistry Objective Question English
| S.N | CHEMISTRY OBJECTIVE English Medium |
| 1 | SOLID STATE┬а |
| 2 | SOLUTION |
| 3 | ELECTROCHEMISTRY |
| 4 | CHEMICAL KINETICS |
| 5 | SURFACE CHEMISTRY |
| 6 | GENERAL PRINCIPLES & PROCESSES OF ISOLATION OF ELEMENTS |
| 7 | THE P-BLOCK ELEMENTS |
| 8 | THE D- AND f-BLOCK ELEMENTS |
| 9 | CO-ORDINATION COMPOUNDS |
| 10 | HALOALKANES AND HALOARENES |
| 11 | ALCOHOLS, PHENOLS AND ETHERS |
| 12 | ALDEHYDES, KETONES AND CARBOXYLIC ACIDS |
| 13 | AMINES |
| 14 | BIOMOLECULES |
| 15 | POLYMERS |
| 16 | CHEMISTRY IN EVERYDAY LIFE |
