Unit 4 » Chemical Kinetics- MCQs (12th) | Chemistry | Objective Questions- 12th

Multiple Choice

ID- 12522

BSEB, 2020 (A)

1. In any reaction, catalyst:

(A) decreases the rate of reaction
(B) increases the rate of reaction
(C) both increases and decreases the rate of reaction
(D) none of these

Sep 12, 2022 at 05:36 AM

Multiple Choice

ID- 12523

BSEB, 2015, 2016 (C)

2. In chemical equation H₂(g) + I₂(g) ⇌ 2HI (g) the equilibrium constant K₂ depends on:

(A) total pressure
(B) catalyst used
(C) amont of H₂ and I₂
(D) temperature

Sep 12, 2022 at 05:43 AM

Multiple Choice

ID- 12524

BSEB, 2015

3. If the rate of reaction is expressed by, Rate = k[A]² [B], the order of reaction will be:

(A) 2
(B) 3
(C) 1
(D) 0

Sep 12, 2022 at 05:46 AM

Multiple Choice

ID- 12525

BSEB, 2021 (A)

4. The rate of zero order reaction A + B → C is:

(A) Rate = K [A]⁰ [B]⁰
(B) Rate = K [A]¹ [B]⁰
(C) Rate = K [A]⁰ [B]¹
(D) None of these

Sep 12, 2022 at 05:50 AM

Multiple Choice

ID- 12526

BSEB, 2021 (A)

5. The minimum amount of energy required to convert reactant molecules into products is:

(A) Kinetic energy
(B) Potential energy
(C) Activation energy
(D) Kinetic energy + Potential energy

Sep 12, 2022 at 05:56 AM

Multiple Choice

ID- 12527

6. Which of the following is an example of a fractional order reaction?

(A) NH₄NO₂ → N₂ + 2H₂O
(B) NO + O₃ → NO₂ + O₂
(C) 2NO + Br₂ → 2NOBr
(D) Ch₃CHO → CH₄ + CO

Sep 12, 2022 at 05:59 AM

Multiple Choice

ID- 12528

7. The unit of rate constant for the reaction 2H₂ + 2NO → 2H₂O + N₂ with has rate = K [H₂] [NO]², is

(A) mol Li^–1 s^–1
(B) s^–1
(C) mol^–2 L² s^–1
(D) mol L^–1

Sep 12, 2022 at 07:01 AM

Multiple Choice

ID- 12529

8. The rate constant of a reaction depends upon:

(A) temperature of the reaction
(B) extent of the reaction
(C) initial concentration of the reaction
(D) the time of completion of reaction

Sep 12, 2022 at 06:06 AM

Multiple Choice

ID- 12530

9. The chemical reaction, 2O₃ → 3O₂ proceeds as O₃ ⇌ O₂ + [O] (fast) [O] + O₃ → 20₂ (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]

Sep 12, 2022 at 06:15 AM

Multiple Choice

ID- 12531

BSEB, 2021 (A)

10. 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

Sep 12, 2022 at 06:17 AM

Multiple Choice

ID- 12532

11. 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) more than one reacting species are involved in one step
(D) Molecularity of the reaction can be determined only experimentally

Sep 12, 2022 at 06:22 AM

Multiple Choice

ID- 12533

12. The overall rate of a reaction is governed by

(A) the rate of fastest intermediate step
(B) the sum total of the rates of all intermediate steps
(C) the average of the rates of all the intermediate steps
(D) the rate of slowest intermediate step

Sep 12, 2022 at 06:25 AM

Multiple Choice

ID- 12534

BSEB, 2018 (C)

13. For a reaction is activation energies for forward and backward reactions are the same, then:

(A) ∆H = 0
(B) ∆S = 0
(C) The order is zero
(D) None of these

Sep 12, 2022 at 06:33 AM

Multiple Choice

ID- 12535

14. A first order reaction takes 40 min for 30% decomposition. What will be t_1/2?

(A) 77.7 min
(B) 52.5 min
(C) 46.2 min
(D) 22.7 min

Sep 12, 2022 at 06:37 AM

Multiple Choice

ID- 12536

15. A first order reaction has a rate constant 1.15 x 10^–3 s^–1. How long time will 5 g of this reactant take to reduce to 3 g?

(A) 444 s
(B) 400 s
(C) 528 s
(D) 669 s

Sep 12, 2022 at 06:40 AM

Multiple Choice

ID- 12537

16. Radioactive disintegration is an example of:

(A) zero order reaction
(B) first order reaction
(C) second order reaction
(D) third order reaction

Sep 12, 2022 at 06:41 AM

Multiple Choice

ID- 12538

17. A plot of log (a – x) against time t is a straight line. This indicates that the reaction is of:

(A) zero order
(B) first order
(C) second order
(D) third order

Sep 12, 2022 at 06:44 AM

Multiple Choice

ID- 12539

18. Rate of which reaction increases with temperature?

(A) Exothermic reaction
(B) Endothermic reaction
(C) 'A' and 'B' both
(D) None of the above

Sep 12, 2022 at 06:46 AM

Multiple Choice

ID- 12540

19. 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

Sep 12, 2022 at 06:50 AM

Multiple Choice

ID- 12541

20. When a catalyst is used in an equilibrium process.

(A) it increases the rate of forward reaction
(B) it decreases the rate of backward reaction
(C) it decreases activation energy of forward process and decreases activation energy of backward process
(D) it fastens the attainment of equilibrium by lowering activation energy

Sep 12, 2022 at 06:57 AM

Multiple Choice

ID- 12542

21. 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

Sep 12, 2022 at 06:58 AM

Multiple Choice

ID- 12543

22. 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

Sep 12, 2022 at 07:00 AM

Multiple Choice

ID- 12544

23. Rate law for the reactionA + B → 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

Sep 12, 2022 at 07:05 AM

Multiple Choice

ID- 12545

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

(A) 1.26 x 10¹⁵ s
(B) 2.52 x 10¹⁴ s
(C) 2.52 x 10²⁸ s
(D) Infinite

Sep 12, 2022 at 07:10 AM

Multiple Choice

ID- 12546

25. 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

Sep 12, 2022 at 07:13 AM

Multiple Choice

ID- 12547

BSEB, 2017 (A), 2020 (A)

26. The rate at which a substance reacts, depends upon its

(A) Atomic Mass
(B) Equivalent Mass
(C) Molecular Mass
(D) Active Mass

Sep 12, 2022 at 07:15 AM

Multiple Choice

ID- 12548

BSEB, 2017 (C)

27. Half life period of first order reaction is independent of:

(A) Initial concentration of reactant
(B) Temperature
(C) Pressure
(D) None of these

Sep 12, 2022 at 07:17 AM

Multiple Choice

ID- 14548

BSEB, 2018 (C)

28. $\ce{H2 (g) + Cl2 (g) ->[hv] 2 HCl (g).}$ The order of this reaction is:

(A) Zero order
(B) First order
(C) Second order
(D) None of these

Sep 28, 2022 at 11:36 AM

Multiple Choice

ID- 14549

BSEB, 2018 (C)

29. If for the reaction $\ce{A -> B}$, $\ce{\frac{–d [A]}{dt} = 2 \frac{d [B]}{dt}}$, the rate Law is:

(A) $\ce{\frac{–d[A]}{dt} = K [A]^2}$
(B) $\ce{\frac{d[B]}{dt} = K [A]}$
(C) $\ce{\frac{d[A]}{dt} = K [A]^2}$
(D) $\ce{\frac{–d[B]}{dt} = K [B]^2}$

Sep 28, 2022 at 11:34 AM

Multiple Choice

ID- 14553

30. The hydrolysis of ethyl acetate: $\ce{CH3COOC2H5 + H2O ->[H^+]}$ $\ce{CH3COOH + C2H5OH}$ is a reaction of:

(A) zero order
(B) pseudo first order
(C) second order
(D) third order

Sep 28, 2022 at 03:37 PM

Multiple Choice

ID- 14554

31. The temperature dependence of the rate of a chemical reaction can be explained by Arrhenius equation which is

(A) $\ce{k = Ae^{E_a/RT}}$
(B) $\ce{k = Ae^{-E_a/RT}}$
(C) $\ce{k = Ae×\frac{E_a}{RT}}$
(D) $\ce{k = Ae×\frac{RT}{E_a}}$

Sep 28, 2022 at 03:36 PM

Multiple Choice

ID- 14555

BSEB, 2016

32. $\ce{t_\frac{1}{2}}$ for order reaction is:

(A) $\frac{0.6}{k}$
(B) $\frac{0.693}{k}$
(C) $\frac{0.683}{k}$
(D) $\frac{0.10}{k}$

Sep 29, 2022 at 06:23 AM

Multiple Choice

ID- 14556

BSEB, 2017 (A)

33. For a zero order reaction:

(A) $\ce{t^{1/2} \propto a}$
(B) $\ce{t^{1/2} \propto \frac{1}{a}}$
(C) $\ce{t^{1/2} \propto a^2}$
(D) $\ce{t^{1/2} \propto \frac{1}{a^2}}$

Sep 29, 2022 at 06:46 AM

Multiple Choice

ID- 14557

BSEB, 2017(C)

34. The order of reaction of the reaction: $\ce{CH3COOC2H5 + H2O ->[H^+]}$ $\ce{CH3COOH + C2H5OH}$ is

(A) 3
(B) 2
(C) 1
(D) 0

Sep 29, 2022 at 06:51 AM

Multiple Choice

ID- 14558

BSEB, 2018 (A)

35. If $\frac{dx}{dt}$ = $\ce{k[H^+]^n}$ and rate becomes 100 times when pH changes from 2 to 1, the order of reaction is:

(A) 1
(B) 2
(C) 3
(D) 0

Sep 29, 2022 at 06:56 AM

Chemical Kinetics

Board » Bihar Board » Class 12th » English Medium » Science » Chemistry » Part-1 » Unit 4: Chemical Kinetics

Objective Questions (MCQs)

1. In any reaction, catalyst:

2. In chemical equation H₂(g) + I₂(g) ⇌ 2HI (g) the equilibrium constant K₂ depends on:

3. If the rate of reaction is expressed by, Rate = k[A]² [B], the order of reaction will be:

4. The rate of zero order reaction A + B → C is:

5. The minimum amount of energy required to convert reactant molecules into products is:

6. Which of the following is an example of a fractional order reaction?

7. The unit of rate constant for the reaction 2H₂ + 2NO → 2H₂O + N₂ with has rate = K [H₂] [NO]², is

8. The rate constant of a reaction depends upon:

9. The chemical reaction, 2O₃ → 3O₂ proceeds as O₃ ⇌ O₂ + [O] (fast) [O] + O₃ → 20₂ (slow) The rate law expression will be:

10. The unit of rate and rate constant are same for a:

11. For a unimolecular reaction:

12. The overall rate of a reaction is governed by

13. For a reaction is activation energies for forward and backward reactions are the same, then:

14. A first order reaction takes 40 min for 30% decomposition. What will be t_1/2?

15. A first order reaction has a rate constant 1.15 x 10^–3 s^–1. How long time will 5 g of this reactant take to reduce to 3 g?

16. Radioactive disintegration is an example of:

17. A plot of log (a – x) against time t is a straight line. This indicates that the reaction is of:

18. Rate of which reaction increases with temperature?

19. The activation energy in a chemical reaction is defined as:

20. When a catalyst is used in an equilibrium process.

21. The role of a catalyst is to change .......... .

22. In the presence of a catalyst, the heat evolved or absorbed during the reaction .......... .

23. Rate law for the reactionA + B → 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 .......... .

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

25. The value of rate constant of a pseudo first order reaction .......... .

26. The rate at which a substance reacts, depends upon its

27. Half life period of first order reaction is independent of:

28. $\ce{H2 (g) + Cl2 (g) ->[hv] 2 HCl (g).}$ The order of this reaction is:

29. If for the reaction $\ce{A -> B}$, $\ce{\frac{–d [A]}{dt} = 2 \frac{d [B]}{dt}}$, the rate Law is:

30. The hydrolysis of ethyl acetate: $\ce{CH3COOC2H5 + H2O ->[H^+]}$ $\ce{CH3COOH + C2H5OH}$ is a reaction of:

31. The temperature dependence of the rate of a chemical reaction can be explained by Arrhenius equation which is

32. $\ce{t_\frac{1}{2}}$ for order reaction is:

33. For a zero order reaction:

34. The order of reaction of the reaction: $\ce{CH3COOC2H5 + H2O ->[H^+]}$ $\ce{CH3COOH + C2H5OH}$ is

35. If $\frac{dx}{dt}$ = $\ce{k[H^+]^n}$ and rate becomes 100 times when pH changes from 2 to 1, the order of reaction is:

Chemical Kinetics

Board » Bihar Board » Class 12th » English Medium » Science » Chemistry » Part-1 » Unit 4: Chemical Kinetics

Objective Questions (MCQs)

1. In any reaction, catalyst:

2. In chemical equation H2(g) + I2(g) ⇌ 2HI (g) the equilibrium constant K2 depends on:

3. If the rate of reaction is expressed by, Rate = k[A]2 [B], the order of reaction will be:

4. The rate of zero order reaction A + B → C is:

5. The minimum amount of energy required to convert reactant molecules into products is:

6. Which of the following is an example of a fractional order reaction?

7. The unit of rate constant for the reaction 2H2 + 2NO → 2H2O + N2 with has rate = K [H2] [NO]2, is

8. The rate constant of a reaction depends upon:

9. The chemical reaction, 2O3 → 3O2 proceeds as O3 ⇌ O2 + [O] (fast) [O] + O3 → 202 (slow) The rate law expression will be:

10. The unit of rate and rate constant are same for a:

11. For a unimolecular reaction:

12. The overall rate of a reaction is governed by

13. For a reaction is activation energies for forward and backward reactions are the same, then:

14. A first order reaction takes 40 min for 30% decomposition. What will be t1/2?

15. A first order reaction has a rate constant 1.15 x 10–3 s–1. How long time will 5 g of this reactant take to reduce to 3 g?

16. Radioactive disintegration is an example of:

17. A plot of log (a – x) against time t is a straight line. This indicates that the reaction is of:

18. Rate of which reaction increases with temperature?

19. The activation energy in a chemical reaction is defined as:

20. When a catalyst is used in an equilibrium process.

21. The role of a catalyst is to change .......... .

22. In the presence of a catalyst, the heat evolved or absorbed during the reaction .......... .

23. Rate law for the reactionA + B → 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 .......... .

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

25. The value of rate constant of a pseudo first order reaction .......... .

26. The rate at which a substance reacts, depends upon its

27. Half life period of first order reaction is independent of:

28. $\ce{H2 (g) + Cl2 (g) ->[hv] 2 HCl (g).}$ The order of this reaction is:

29. If for the reaction $\ce{A -> B}$, $\ce{\frac{–d [A]}{dt} = 2 \frac{d [B]}{dt}}$, the rate Law is:

30. The hydrolysis of ethyl acetate: $\ce{CH3COOC2H5 + H2O ->[H^+]}$ $\ce{CH3COOH + C2H5OH}$ is a reaction of:

31. The temperature dependence of the rate of a chemical reaction can be explained by Arrhenius equation which is

32. $\ce{t_\frac{1}{2}}$ for order reaction is:

33. For a zero order reaction:

34. The order of reaction of the reaction: $\ce{CH3COOC2H5 + H2O ->[H^+]}$ $\ce{CH3COOH + C2H5OH}$ is

35. If $\frac{dx}{dt}$ = $\ce{k[H^+]^n}$ and rate becomes 100 times when pH changes from 2 to 1, the order of reaction is:

2. In chemical equation H₂(g) + I₂(g) ⇌ 2HI (g) the equilibrium constant K₂ depends on:

3. If the rate of reaction is expressed by, Rate = k[A]² [B], the order of reaction will be:

7. The unit of rate constant for the reaction 2H₂ + 2NO → 2H₂O + N₂ with has rate = K [H₂] [NO]², is

9. The chemical reaction, 2O₃ → 3O₂ proceeds as O₃ ⇌ O₂ + [O] (fast) [O] + O₃ → 20₂ (slow) The rate law expression will be:

14. A first order reaction takes 40 min for 30% decomposition. What will be t_1/2?

15. A first order reaction has a rate constant 1.15 x 10^–3 s^–1. How long time will 5 g of this reactant take to reduce to 3 g?

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