Chemical Kinetics

This is an MCQ-based quiz on Chemical Kinetics.

This includes the Integration method, Half-life period method, Graphical method, and Ostwald’s isolation method.

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

2 × 10^-2 s^-1 4 × 10^-4 s^-1 20 s^-1 2 × 10^-4 s^-1

The unit of rate constant for a zero order reaction is

mol L^-1s^-1 s^-1 L mol^-1s^-1 L^2mol^-2s^-1

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

Zero 3 2 1

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

triple increase by a factor of 4 double remain unchanged

A catalyst increases the speed of a chemical reaction by

Increasing activation energy

Decreasing activation energy

Increasing reactant energy

Decreasing threshold energy

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?

2 1 3 0

The rate constant of a reaction depends upon

Temperature of the reaction

Extent of the reaction

Initial concentration of the reactants

The time of completion of reaction

The unit of rate and rate constant are same fora

Zero order reaction

First order reaction

Second order reaction

Third order reaction

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

Order of a reaction

Molecularity of a reaction

Fast step of the mechanism of a reaction

Half-life of the reaction

For a unimolecular reaction

The order and molecularity of the slowest step are equal to one

Molecularity of the reaction can be zero, one or two

Molecularity of the reaction can be determined only experimentally

More than one reacting species are involved in one step

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

2 3 1 0

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 ?

2 × 10-4 4 × 10-2 2 × 10-2 1 × 10-2

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?

bar min-1, bar2 min-1 bar min-1, bar1/2 min-1 bar1/2 min-1, bar2 min-1 bar min-1, bar1/2 min-1

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?

9 times 4 times 16 times 8 times

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

NH4NO2 → N2 + 2H2O NO + O3 → NO2 + O2 2NO + Br2 → 2NOBr CH3CHO → CH4 + CO

Which of the following is the correct expression for the temperature coefficient (n)?

n = Rate constant at T + 10°/Rate constant at T° n = Rate constant at T + 20°/Rate constant at T° n = Rate constant at T + 30°/Rate constant at T° n = Rate constant at T + 40°/Rate constant at T°

What happens to the peak of the curve in the Maxwell-Boltzmann distribution graph if temperature increases?

Shifts forward and upward Shifts forward and downward Shifts backward and upward Shifts backward and downward

Which of the following represents the Boltzmann factor?

e-Ea eEa e-Ea/RT eEa/RT

What is R in the equation k = Ae-Ea/RT?

R = 8.314 J K-1 mol-1 R = 3.184 J K-1 mol-1 R = 4.318 J K-1 mol-1 R = 1.438 J K-1 mol-1

The rate constant of a reaction is 6 × 10-3 s-1 at 50° and 9 × 10-3 s-1 at 100° C. Calculate the energy of activation of the reaction.

6.123 kJ mol-1 8.124 kJ mol-1 12.357 kJ mol-1 18.256 kJ mol-1

Quiz/Test Summary

Title: Chemical Kinetics

Questions: 20

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