Chemical Kinetics - Class 12 MCQ

For a reversible reaction A  B, Ist order in both the directions, the rate of reaction is given by:

Which curve represnts Zero order reaction?

For the decomposition of N₂O₅(g), it is given that:

Activation energy E_a

Activation energy E'_a

_then:

A reaction, occurs by the following mechanisum :

A₂ ⇆ A + A        .......(Slow)

Its order would be:

The rate of reaction becomes 2 times for every 10⁰C rise in temperature. How the rate of reaction will increase when temperature is increased from 30⁰C to 80⁰C?    

A drop of solution (volume 0.05 mL) contains 3.0 x 10^-6 mole of H⁺. If the rate constant of disappearance of H⁺ is 1.0 x 10^-7 mol litre^-1 sec^-1. How long would it take for H⁺ in drop to disappear?

Ethylene is produced by cyclobutane as:

The rate constant is 2.48 x 10^-4 sec^-1. In what time will the molar ratio of the ethylene to cyclobutane in reaction mixture attain the value equals to unity ?    

A reaction takes place in three steps with individual rate constant and activation energy.

Overall rate constant, K = (k₁k₃/k₂)^2/3

Overall activation energy of the reaction will be:

In the following first order competing reactions :
A + Reagent ---> Product
B +  Reagent ---> Product
The ratio of K₁/K₂, if only 50% of B will have been reacted when 94% of A has been reacted in same time is:  

From the following data, the activation energy for the reaction (cal/mol):

    A substance undergoes first order decomposition. The decomposition follows two parallel first order reactions as:

​The percentage distribution of B and C are:

Mathematical expression for t_1/4, i.e., when (1/4)th reaction is over following first order kinetics can be given by:

The rateconstant of a second order reaction is 10^-2 (Ms)^-1. The rate constant expressed in cc. molecule^-1 min^-1 is:
 

The rate of disappearance of SO₂ in the reaction; 2SO₂ + O₂ ---> 2SO₃ is 1.28 x 10^-3 g/sec. The the rate of formation of SO₃ is:

The rate of a first order reaction is 1.5 x 10^-2 M min-1 at 0.5 M concentration of reactant. The half-life of reaction is:    

For a reaction aA -->bB when [A] = 2.2 mM, the rate was found to be 2.4 mMs^-1. On reducing concentration of [A] to half , the rate changes to 0.6 mMs^-1. The order of reaction with respect to A is:
 

​During the kinetic study of the reaction  following results were obtained. 

On the basis the data, which one is correct?

The reaction L ---> 4  is started with 10 g of L. After 30 and 90 mintue, 5 g and 1.25 g of L are left respectively. The order of reaction is :    

The differential rate expression for the reaction H₂ + I₂ --> 2HI is:

In a first order reaction the concentration of reactant decreases from 800 mol/dm³ to 50 mol/dm³ in 2 x 10⁴ sec. The rate constant of reaction in sec-1 is:    

Plots showing the variation of the rate constant (k) with temperature (T) are given below. The plot that follows Arrhenius equation is:

The rate constants of three reactions involving reactant A only obeying I, II, III order respectively is same. Which of the following is true?​

log_e K vs. 1/T plots shows a straight line having slope of 120⁰ and intercepts on the Y-axis of 2, then :    

A reaction occurs in three rate detemining steps having rate constant K₁, K₂ and K₃ respectively and arrehenius factor A₁, A₂, A₃ respectively. The overall rate constant . If energy of activations for each step is Ea₁, Ea₂, and Ea₃ respectively, then overall energy of activation is:

At 3 km altitude, water boils at 90⁰C and 300 seconds are taken to cook a ‘3 minute egg’. The temperature coefficient for the process of cooking is:    

Select the incorrect statement:    

The rate expression for a reaction is  (α and β > 0). The half life of the reaction can be given by: