Order of a Reaction

IMPORTANT

Order of a Reaction: Overview

This topic covers concepts, such as, Order of a Reaction etc.

Important Questions on Order of a Reaction

EASY
IMPORTANT

For the following elementary reaction, determine its order of reaction and the dimensions of the rate constant:

2NOgN2Og+12O2

EASY
IMPORTANT

For a reaction, A+2BC, the rate is given by +d[C]dt=kA[B], hence, the order of the reaction is:

EASY
IMPORTANT

Order of a reaction is the sum of exponents of _____ in the rate equation.

MEDIUM
IMPORTANT

Rate constant and rate of a reaction have the same units for reactions of _____ order.

EASY
IMPORTANT

What is the order for the following reactions?
CHCl3 (g) +Cl2 (g) CCl4 (g) +HCl (g), rate=K[CHCl3] [Cl2]1/2

EASY
IMPORTANT

The rate law for the gas-phase reaction 2NO (g)+ O2 (g)  2NO2 (g) is rate =K[NO2]2 [O2]. What is the order of the reaction with respect to each of the reactants and what is the overall order of the reaction?

HARD
IMPORTANT

Explain the term order of a reaction with examples.

HARD
IMPORTANT

The following results have been obtained during the kinetic studies of the reaction:

2A+B  C+D

Experiment [A]/mol L-1 [B]/mol L-1 Initial rate of formation of D mol L-1 min-1
I 0.1 0.1 6.0×10-3
II 0.3 0.2 7.2×10-2
III 0.3 0.4 2.88×10-1
IV 0.4 0.1 2.40×10-2

Determine the rate law and the rate constant for the reaction.

HARD
IMPORTANT

In a reaction between A and B, the initial rate of reaction (ro) was measured for different initial concentration of A and B as given below:

A/ mol L-1 0.20 0.20 0.40
B/ mol L-1 0.30 0.10 0.05
ro /mol L-1 s-1 5.07×10-5 5.07×10-5 1.43×10-4

What is the order of the reaction with respect to A and B?

MEDIUM
IMPORTANT

If the rate v/s [A]2 graph is a straight line, the reaction is of second order.

EASY
IMPORTANT

The order of a reaction can be determined with the help of its rate law expression.

EASY
IMPORTANT

What is the order of a reaction which has a rate expression rate=kA3/2 B-1

EASY
IMPORTANT

The rate of the reaction,

3A+2B  Products

is given by the rate expression :

Rate=kAB2

If A is taken in excess, the order of the reaction would be :

EASY
IMPORTANT

If a certain reaction is first order with respect to A, second order with respect to B and zero order with respect to C then what is the order of reaction?

EASY
IMPORTANT

When initial concentration is doubled, the time for half-reaction is also doubled, the order of this reaction is:

EASY
IMPORTANT

From the rate expression for the following reaction, determine its order of reaction and the dimensions of the rate constant.

H2O2aq+3I-aq+2H+2H2Ol+I3-;Rate=kH2O2I-

EASY
IMPORTANT

For the following elementary reaction, determine its order of reaction and the dimensions of the rate constant:

2NOgN2Og+12O2

MEDIUM
IMPORTANT

The rate law for reaction between the substances A and B is given by:

Rate = k A n B m

On doubling the concentration of A and halving the concentration of B, the ratio of the new rate to the earlier rate of reaction will be:

EASY
IMPORTANT

A reaction involving two different reactants can never be: