MCQ of Chemical Kinetics

Chemical Kinetics

01 For zero order reaction.

(a) $\displaystyle t\frac{1}{2}\alpha a$

(b) $\displaystyle t\frac{1}{2}\alpha \frac{1}{a}$

(d) $\displaystyle t\frac{1}{2}\alpha \frac{1}{{{{a}^{2}}}}$

first order reaction $\displaystyle {{t}_{{\frac{1}{2}}}}$ has value.

(a) $\displaystyle \frac{{0.6}}{K}$

(b) $\displaystyle \frac{{0.10}}{K}$

(d) $\displaystyle \frac{{0.93}}{K}$

Ans C

03. $\displaystyle {{t}_{{^{{\frac{1}{2}}}}}}\alpha \frac{1}{{{{a}^{2}}}}$ indicates that this chemical

(a) a first order reaction

(b) is a second order reaction

(d) a complex reactionAns B

04. The rate of a reaction is expressed in the following way, rate = K[A]²[B] then the order of this reaction will be.

(a) 2 (b) 1 (c) 3 (d) 0

Ans:-c

05. A first order reaction is 75% complete in 60 minutes, then the half-life is

(a) 20 minutes (b) 25 minutes (c) 30 minutes (d) 15 minutes

Ans:-c

06. Depends on the rate constant.

(a) temperature (b) initial concentration (c) time (d) none of these

07. The unit of rate constant for a zero order reaction is (a) S^-1

(b) S^-2

(d) Mol L^-1S^-1

Ans:-d

08. The rate of reaction of a substance depends on which of the following?

(a) atomic mass

(b) equivalent mass

(d) active volume

Ans:-d

09. The equilibrium constant of the chemical reaction H₂(g)+I₂(g) ⇔ 2HI(g) depends on Kp.

(a) at full pressure

(b) on the catalyst

(d) temperature

Ans:-d

10. The order of reaction in water is H₂(g)+Cl₂(g) → 2HCl.

(a) 3

(b) 1

(d) o

Ans:-d

11. On doubling the concentration of a second order reaction, the rate

(a) is halved

(b) is irreversible

(d) doubles

Ans C

12. Arrhenius’ equation is.

(a) $\displaystyle K=A{{e}^{{-Ea}}}/RT$

(b) $\displaystyle K=A{{e}^{{e-R}}}/EaT$

(d) $\displaystyle K=A{{E}^{{-Ea}}}/RT$

Ans:-a

13. In a chemical reaction, the velocity determined at any instant is called.

(a) initial velocity

(b) final velocity

(d) average velocity

Ans:-c

14. Reaction A→B The rate of the reaction is doubled, if the concentration of the reactant is quadrupled, what will be the order of the reaction if the concentration of the reactant is quadrupled? (a) o

(b) 1/2

(d) 4

Ans:-b

15. The rate law for the reaction A+2B→3C is rate = K[A][B]⁰ What is the order of the reaction?

(a) 0

(b) 2

(d) 3

Ans C

16. The unit of rate constant for the following homogeneous reaction A + B →C will be

(a) sec^-1

(b) sec^-1mol^-1

(d) sec

Ans:-b

17. The minimum energy required for a reaction to occur is called

(a) internal energy

(b) free energy,

(d) threshold energy

Ans:-d

18. CH₃COOC₂H₅ + H₂0→ CH₃COOH + C₂H₅OH The molarity and order of the reaction are.

(a) 0&1

(b) 1&2

(d) none of these

Ans:-c

19. The unit of rate constant for a first order reaction is-

(a) Time-1

(b) mole liter-1 second-1

(b) liter mole-1 second-1

(d) liter mole-1 second

Ans A

20. The rate constant of a chemical reaction does not depend on-

(a) at temperature

(b) at pressure

(d) activation energy

Ans:-c

21. 2N₂0 →2N₂ + O₂ velocity = k(N₂O) The value of the order of this reaction will be-

(a) 1

(b) 2

(d) 4

Ans:-a

22. The order of the reaction whose rate constant is 2.0 x 10^-3 sec¹ will be-

(a) 0

(b) 1

(c ) 2

(d) 3

Ans:-b

23. Which of the following equation describes the accelerated velocity?

(a) $\displaystyle \frac{{-dc}}{{dt}}$

(b) $\displaystyle \frac{{-dx}}{{dt}}$

(d) $\displaystyle \frac{{dc}}{{-dt}}$

Ans:-a

24. A chemical reaction $\displaystyle {{t}_{{{1}/{2}\;}}}\alpha \frac{1}{{{{n}^{{n-1}}}}}$ half age of $\displaystyle {{t}_{{{1}/{2}\;}}}$ will be-

(a) n

(b) n^-1

(d) (n)²

Ans:-a

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

(a) 2

(b) 3

(d) 0

MCQ of Chemical Kinetics

Leave a Reply Cancel reply