Chemical Kinetics Class 12 MCQ. We covered all the Chemical Kinetics Class 12 MCQ in this post for free so that you can practice well for the exam.
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MCQ on Chemical Kinetics for NEET Students
Under the same reaction conditions, the initial concentration of 1.386 mol dm3 of a reactant becomes half in 40 seconds and 20 seconds through first-order and zero-order kinetics respectively. The factor by which the rate constant of a zero-order reaction should be multiplied in order to get the rate constant of a first-order reaction?
(A) 0.5
(B) 1
(C) 1.5
(D) 2
Option a – 0.5
In a first-order reaction, the concentration of the reactant decreases from 0.8 M to 0.4 M in 15 minutes. The time taken for the concentration to change from 0.1 M to 0.025 M is ………..
(A) 60 minutes
(B) 15 minutes
(C) 7.5 minutes
(D) 30 minutes
Option d – 30 minutes
According to Maxwell Boltzmann distribution of energy ………
(A) the fraction of molecules with the most probable kinetic energy increases with an increase in temperature
(B) the area under the curve increases with an increase in temperature
(C) the area under the curve must not change with an increase in temperature
(D) the area under the curve decreases with an increase in temperature.
Option c – the area under the curve must not change with an increase in temperature
The reaction X -> Y follows first-order kinetics. The time taken for 0.8 moles of X to produce 0.6 moles of Y is 1 hour. What is the time taken for the conversion of 0.9 moles of X to produce 0.675 moles of Y?
(A) 1 hour
(B) 1.5 hours
(C) 2.5 hours
(D) 3 hours
Option a – 1 hour
The rate of a reaction between two reactants A and B decreases by a factor of 4 if the concentration of reactant B is doubled. The order of reaction with respect to reactant B is ……….
(A) 2
(B) -2
(C) 1
(D) -1
Option b – -2
The time required for a first-order reaction to being 99% complete is ………. the time taken for the reaction to be 90% complete.
(A) same as
(B) twice
(C) thrice
(D) half
Option b – twice
The half-life of a reaction is inversely proportional to the square of the initial concentration of the reactant. Then the order of the reaction is ………
(A) 0
(B) 1
(C) 2
(D) 3
Option d – 3
10 g of a radioactive isotope is reduced to 1.25g in 12 years. Therefore, the half-life period of the isotope is ……..
(A) 24 years
(B) 4 years
(C) 3 years
(D) 8 years
Option b – 4 years
The thermal decomposition of a compound follows first-order reaction kinetics. If a sample of the compound decomposes 50 % in 126 minutes how much time will it take for 90 % decomposition?
(A) About 315 minutes
(B) About 601 minutes
(C) About 419 minutes
(D) About 532 minutes
Option c – About 419 minutes
The temperature coefficient of a reaction is 2. When the temperature is increased from 30 °C to 70 °C, the rate of reaction is increased by ……….
(A) 4 times
(B) 8 times
(C) 16 times
(D) 32 times
Option c – 16 times
The units of rate constant and rate of reaction are identical for ………. order reaction.
(A) zero
(B) first
(C) second
(D) third
Option a – zero
We covered all the chemical kinetics class 12 MCQ above in this post for free so that you can practice well for the exam.
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