Chemical Kinetics

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Chemical Kinetics

These MCQs are intended for checking your Chemistry subject, Chapter Chemical Kinetics knowledge.

For the reaction of 4A + B→ 2C + D. Which of the following statement is not correct?

1. The rate of disappearance of B is one fourth of the rate of disappearance of A

2. The rate of appearance of C is one half the rate of disappearance of B

3. The rate of formation of C and D are equal

4. The rate of formation of D is one half the rate of consumption of A

In the reaction K₁ and K₂ are the velocity constants for the forward and backward reaction respectively. The equilibrium constant is
(A)
1
2
K
K
K

(B) K = K1 × K2
(C)
2
1
K
K
K

(D) None of the above

1. K = K₁/K₂

2. K = K₂/K₁

3. K = K₁×K₂

4. None of these

Rate constant in case of first order reaction is

1. inversely proportional to the square of concentration units

2. independent of concentration units

3. inversely proportional to the concentration units

4. directly proportional to concentration units

A first order reaction takes 40 min for 30% decomposition. What will be t₁₂?

1. 52.5 min

2. 46.2 min

3. 22.7 min

4. 77.7 min

In pseudo unimolecular reactions

1. both the reactants are present in low concentration

2. one of the reactant is present in excess

3. one of the reactant is non-reactive

4. both the reactants are present in same concentration

The rate constant of a reaction changes when…

1. Pressure is changed

2. Concentration of reactants changed

3. Temperature is changed

4. a catalyst is added

In the reaction A + B→ Products, the doubling of [A], increases the reaction rate to four times, but doubling of [B] has no effect on the reaction rate. The rate expression is….

1. Rate = K[A]2[B]2

2. Rate = K[A][B]

3. Rate = K[A]2

4. Rate = K[A]

The number of molecules of the reactants taking part in a single step of the reaction is indicative of

1. fast step of the mechanism of a reaction

2. moleclarity of a reaction

3. half-life of the reaction

4. order of a reaction

Half life period of a first order reaction is 10 min. What percentage of the reaction will be completed in 100 min?

1. 75%

2. 25%

3. 50%

4. 99.9%

For a reaction nx – y → z the rate of reaction becomes twenty seven times when the concentration of X is increased three times. What is the order of the reaction?

1. 0

2. 1

3. 2

4. 3

_____does not affect the rate of reaction.

1. physical state of reactants

2. amount of the reactants

3. size of the vessel

4. ∆H of reaction

A reaction in which reactants (R) are converted into products (P) follows second order kinetics. If concentration of R is increased by four times, what will be the increase in the rate of formation of P?

1. 9 times

2. 4 times

3. 16 times

4. 8 times

Rate of reaction is defined as

1. Increase in the concentration of a product

2. All the above three are correct

3. Change in the concentration of any one of the reactants or products per unit time

4. Decrease in the concentration of a reactant

The chemical reaction, 2O₃ → 3O₂ proceeds as O₃ ⇌ O₂ + |O| (fast) |O| + O₃ → 2O₂ (slow) The rate law expression will be

1. Rate = k [O₃]² [O₂]^-1

2. Rate = k [O₂] [O]

3. Rate = k [O₃]²

4. Rate = k [O] [O₃]

The rate of reaction of spontaneous reaction is generally very slow. This is due to the fact that:

1. The reaction are exothermic

2. The reaction are endothermic

3. The equilibrium constant of the reaction is < 1

4. The activation energy of the reaction is large

The unit of rate constant for the reaction 2H₂ + 2NO → 2H₂O + N₂which has rate = K|H₂||NO|², is

1. mol L^-1 s^-1

2. mol L^-1

3. mol^-2 L² s^-1

4. s^-1

A zero order reaction is one whose rate is independent of ……

1. Pressure of light

2. Reaction vessel volume

3. Concentration of reactants

4. Temperature

The order of reaction is decided by

1. mechanism of reaction as well as relative concentration of reactants

2. pressure

3. molecularity

4. temperature

The overall rate of a reaction is governed by

1. the rate of fastest intermediate step

2. the average of the rates of all the intermediate steps

3. the rate of slowest intermediate step

4. the sum total of the rates of all intermediate steps

For a reaction pA + qB→ Products. Rate = K[A]m [B]n. Then

1. (p + q) > (m + n)

2. (p + q) = (m + n) or (p + q) ≠ (m + n)

3. (p + q) = (m + n)

4. (p + q) ≠ (m + n)

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

1. amount of H₂ and I₂

2. temperature

3. catalyst used

4. total pressure

For the reaction A + B + C→ Products, Rate = K[A]1/2 [B]1/2 [C]. The order of reaction is

1. 5/6

2. 3

3. 11/6

4. 1

For a unimolecular reaction

1. the order and molecularity of the slowest step are equal to one

2. more than one reacting species are involved in one step

3. molecularity of the reaction can be determined only experimentally

4. molecularity of the reaction can be zero, one or two

In the reaction N₂O₄(g)→2NO₂(g) the pressure of N₂O₄ falls from 0.5 atm to 0.32 atm is 30 minutes, the rate of appearance of NO₂(g) is

1. 0.006 atm min-1

2. 0.003 atm min-1

3. 0.024 atm min-1

4. 0.012 atm min-1

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

1. CH₃CHO → CH₄ + CO

2. NO + O₃ → NO₂ + O₂

3. 2NO + Br₂ → 2NOBr

4. NH₄NO₂ → N₂ + 2H₂O

In a reaction, 2X → Y, the concentration of X decreases from 0.50 M to 0.38 M in 10 min. What is the rate of reaction in Ms^-1 during this interval ?

1. 1 × 10^-2

2. 4 × 10^-2

3. 2 × 10^-4

4. 2 × 10^-2

If the rate of a reaction is expressed by, rate = A [A]² [B], the order of reaction will be

1. 0

2. 2

3. 3

4. 1

For a reaction x + y → z, rate ∝ |X|. What is (i) molecularity and (ii) order of reaction?

1. (i) 1, (ii) 1

2. (i)2,(ii) 2

3. (i)2, (ii) 1

4. (i) 1, (ii) 2

The rate constant of a reaction depends upon

1. temperature of the reaction

2. extent of the reaction

3. initial concentration of the reactants

4. the time of completion of reaction

The decomposition of dimethyl ether is a fractional order reaction. The rate is given by rate =k(PCH₃OCH₃)^3/2. If the pressure is measured in bar and time in minutes, then what are the units of rate and rate constant?

1. bar min^-1, bar^1/2 min^-1

2. bar min^-1, bar^1/2 min^-1

3. bar^1/2 min^-1, bar² min^-1

4. bar min^-1, bar² min^-1

The unit of rate and rate constant are same for

1. third order reaction

2. zero order reaction

3. first order reaction

4. second order reaction

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Try other Chapter

Chapter 1: The Solid State.
Chapter 2: Solutions.
Chapter 3: Electrochemistry.
Chapter 5: Surface Chemistry.
Chapter 6: General Principles and Processes of Isolation of Elements.
Chapter 7: d & f Block Elements.
Chapter 8: Coordination Compounds.
Chapter 9: Haloalkanes and Haloarenes.
Chapter 10: Alcohols, Phenols, and Ethers.
Chapter 11: Aldehydes, Ketones, and Carboxylic Acids.
Chapter 12: Amines.
Chapter 13: Biomolecules.
Chapter 14: Polymers.
Chapter 15: Chemistry in Everyday Life.

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