Class 12 Chemistry - Chapter 4: Chemical Kinetics MCQ Questions

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Your Class 12 Chemistry Study Path

Question 1

If half life period of a first order reaction is 100 seconds. Then rate constant will be:

A 6.93 second^-1

B 0.693 second^-1

C 6.93 Ã— 10^-2 second^-1

D 6.93 Ã— 10^-3 second^-1

Question 2

If a graph is plotted between In k and 1/T for the first order reaction, the slope of the straight line so obtained is given by

A (frac { E_a }{2.303})

B (frac { 2.303 }{E_a.R})

C (frac { E_a }{2.303 R})

D –(frac { E_a }{R})

Question 3

The half life of a first order reaction having rate constant 200 s^-1 is

A 1.150 Ã— 10^-3 S

B 1.150 Ã— 10^-2 S

C 3.465 Ã— 10^-3 s

D 3.465 Ã— 10^-2 s

Question 4

The units of the rate constant for the second order reaction are:

A mol litre^-1 s^-1

B s^-1

C mol litre^-2 s^-1

D mol^-1 litre s^-1

Question 5

The rate of a reaction is 1.209 Ã— 10^-4LÂ² mol^-2s^-1. The order of the reaction is:

A third

B second

C first

D zero

Question 6

Half life period of a first order reaction is:

A independent of the initial concentration of the reactants

B same for all reactions

C half of the rate constant

D directly proportional to the initial concentration of the reactant

Question 7

If the concentrations are expressed in mol litre^-1 and time in s, then the units of rate constant for the first-order reactions are

A molÂ² litre^-2 s^-1

B s^-1

C mol^-1 litre s^-1

D mol litre^-1 s^-1

Question 8

A catalyst increases the rate of a reaction by

A lowering activation energy

B activating the reactants

C increasing activation energy

D increasing threshold energy

Question 9

If rate constant for a reaction is mole litre^-1 second^-1, then order of reaction is:

A None of these

B Second order

C First order

D Zero order

Question 10

A reaction is found to be of second order with respect to concentration of carbon monoxide. If concentration of carbon monoxide is doubled, the rate of reaction will

A remain unchanged

B double

C increase by a factor of 4

D triple

Question 11

The overall order of a reaction, which has the rate expression: Rate = AC[A]^1/2[B]^3/2 is:

A Zero order

B Third order

C Second order

D First order

Question 12

The value of k for a reaction is 2.96 Ã— 10^-30 s^-1. What is the order of the reaction?

A 1

B 2

C 3

D Zero

Question 13

Half life period of a first order reaction depends upon:

A None of these

B Rate constant of reaction

C Concentration of products

D Concentration of reactants

Question 14

A catalyst increases the speed of a chemical reaction by

A decreasing threshold energy

B increasing reactant energy

C decreasing activation energy

D increasing activation energy

Question 15

Time required for 100% completion of a zero order reaction is:

A None of these

B t_100% = a/2k

C t_100% = a.k

D t_100% = a/k

Question 16

A first order reaction has a half life period of 34.65 seconds. Its rate constant is

A 2 Ã— 10^-4 s^-1

B 20 s^-1

C 4 Ã— 10^-4 s^-1

D 2 Ã— 10^-2 s^-1

Question 17

Arrhenius equation is represented by:

A None of these

B t1/2 = 0.693/k

C k = Ae^-Ea/RT

D k = Ae^Ea/RT

Question 18

Identify the order of reaction from the given rate constant k = 2.6 Ã— 10^-4 L mol^-1 s^-1

A None of these

B Second

C Zero

D First

Question 19

The unit of rate constant for a zero order reaction is

A L²mol^-2s^-1

B L mol^-1s^-1

C s^-1

D mol L^-1s^-1

Question 20

For a reaction: N₂ + 3H₂ â†’ 2NH₃, the rate of reaction with respect to NH₃ will be:

A –(frac { 1 }{10}) (frac { d[NH_3] }{dt})

B +(frac { 1 }{10}) (frac { d[NH_3] }{dt})

C –(frac{d[NH_3]^2}{d t})

D –(frac{dleft[mathrm{NH}_{3}right]}{d t})

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Class 12 Chemistry - Chapter 4: Chemical Kinetics MCQ Questions

Your Class 12 Chemistry Study Path

If half life period of a first order reaction is 100 seconds. Then rate constant will be:

If a graph is plotted between In k and 1/T for the first order reaction, the slope of the straight line so obtained is given by

The half life of a first order reaction having rate constant 200 s^-1 is

The units of the rate constant for the second order reaction are:

The rate of a reaction is 1.209 Ã— 10^-4LÂ² mol^-2s^-1. The order of the reaction is:

Half life period of a first order reaction is:

If the concentrations are expressed in mol litre^-1 and time in s, then the units of rate constant for the first-order reactions are

A catalyst increases the rate of a reaction by

If rate constant for a reaction is mole litre^-1 second^-1, then order of reaction is:

A reaction is found to be of second order with respect to concentration of carbon monoxide. If concentration of carbon monoxide is doubled, the rate of reaction will

The overall order of a reaction, which has the rate expression: Rate = AC[A]^1/2[B]^3/2 is:

The value of k for a reaction is 2.96 Ã— 10^-30 s^-1. What is the order of the reaction?

Half life period of a first order reaction depends upon:

A catalyst increases the speed of a chemical reaction by

Time required for 100% completion of a zero order reaction is:

A first order reaction has a half life period of 34.65 seconds. Its rate constant is

Arrhenius equation is represented by:

Identify the order of reaction from the given rate constant k = 2.6 Ã— 10^-4 L mol^-1 s^-1

The unit of rate constant for a zero order reaction is

For a reaction: N₂ + 3H₂ â†’ 2NH₃, the rate of reaction with respect to NH₃ will be:

Practice Complete!

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Class 12 Chemistry - Chapter 4: Chemical Kinetics MCQ Questions

Your Class 12 Chemistry Study Path

If half life period of a first order reaction is 100 seconds. Then rate constant will be:

If a graph is plotted between In k and 1/T for the first order reaction, the slope of the straight line so obtained is given by

The half life of a first order reaction having rate constant 200 s-1 is

The units of the rate constant for the second order reaction are:

The rate of a reaction is 1.209 Ã— 10-4LÂ² mol-2s-1. The order of the reaction is:

Half life period of a first order reaction is:

If the concentrations are expressed in mol litre-1 and time in s, then the units of rate constant for the first-order reactions are

A catalyst increases the rate of a reaction by

If rate constant for a reaction is mole litre-1 second-1, then order of reaction is:

A reaction is found to be of second order with respect to concentration of carbon monoxide. If concentration of carbon monoxide is doubled, the rate of reaction will

The overall order of a reaction, which has the rate expression: Rate = AC[A]1/2[B]3/2 is:

The value of k for a reaction is 2.96 Ã— 10-30 s-1. What is the order of the reaction?

Half life period of a first order reaction depends upon:

A catalyst increases the speed of a chemical reaction by

Time required for 100% completion of a zero order reaction is:

A first order reaction has a half life period of 34.65 seconds. Its rate constant is

Arrhenius equation is represented by:

Identify the order of reaction from the given rate constant k = 2.6 Ã— 10-4 L mol-1 s-1

The unit of rate constant for a zero order reaction is

For a reaction: N2 + 3H2 â†’ 2NH3, the rate of reaction with respect to NH3 will be:

Practice Complete!

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The half life of a first order reaction having rate constant 200 s^-1 is

The rate of a reaction is 1.209 Ã— 10^-4LÂ² mol^-2s^-1. The order of the reaction is:

If the concentrations are expressed in mol litre^-1 and time in s, then the units of rate constant for the first-order reactions are

If rate constant for a reaction is mole litre^-1 second^-1, then order of reaction is:

The overall order of a reaction, which has the rate expression: Rate = AC[A]^1/2[B]^3/2 is:

The value of k for a reaction is 2.96 Ã— 10^-30 s^-1. What is the order of the reaction?

Identify the order of reaction from the given rate constant k = 2.6 Ã— 10^-4 L mol^-1 s^-1

For a reaction: N₂ + 3H₂ â†’ 2NH₃, the rate of reaction with respect to NH₃ will be: