The correct difference between first and second order reactions is that [2018]

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Q.
The correct difference between first and second order reactions is that [2018]

1 the rate of a first-order reaction does not depend on reactant concentrations; the rate of a second-order reaction does depend on reactant concentrations

2 the half-life of a first-order reaction does not depend on ${[A]}_{0}$ ; the half-life of a second-order reaction does depend on ${[A]}_{0}$

3 a first-order reaction can be catalysed; a second-order reaction cannot be catalysed

4 the rate of a first-order reaction does depend on reactant concentrations; the rate of a second-order reaction does not depend on reactant concentrations.

Ans.
(2)

For the first order reaction, $t_{1 / 2} = \frac{0.693}{k}$ which is independent of initial concentration ${[A]}_{0}$ .

For second order reaction, $t_{1 / 2} = \frac{1}{k {[A]}_{0}}$

Half-life depends on initial concentration of reactant.

Solution

Q.
The correct difference between first and second order reactions is that [2018]

1 the rate of a first-order reaction does not depend on reactant concentrations; the rate of a second-order reaction does depend on reactant concentrations

2 the half-life of a first-order reaction does not depend on ${[A]}_{0}$ ; the half-life of a second-order reaction does depend on ${[A]}_{0}$

3 a first-order reaction can be catalysed; a second-order reaction cannot be catalysed

4 the rate of a first-order reaction does depend on reactant concentrations; the rate of a second-order reaction does not depend on reactant concentrations.

Ans.
(2)

For the first order reaction, $t_{1 / 2} = \frac{0.693}{k}$ which is independent of initial concentration ${[A]}_{0}$ .

For second order reaction, $t_{1 / 2} = \frac{1}{k {[A]}_{0}}$

Half-life depends on initial concentration of reactant.

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Solution

Q. The correct difference between first and second order reactions is that [2018]

1 the rate of a first-order reaction does not depend on reactant concentrations; the rate of a second-order reaction does depend on reactant concentrations

2 the half-life of a first-order reaction does not depend on [A]0; the half-life of a second-order reaction does depend on [A]0

3 a first-order reaction can be catalysed; a second-order reaction cannot be catalysed

4 the rate of a first-order reaction does depend on reactant concentrations; the rate of a second-order reaction does not depend on reactant concentrations.

Ans. (2) For the first order reaction, t1/2=0.693k which is independent of initial concentration [A]0. For second order reaction, t1/2=1k[A]0 Half-life depends on initial concentration of reactant.

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Q.
The correct difference between first and second order reactions is that [2018]

2 the half-life of a first-order reaction does not depend on ${[A]}_{0}$ ; the half-life of a second-order reaction does depend on ${[A]}_{0}$

Ans.
(2)

For the first order reaction, $t_{1 / 2} = \frac{0.693}{k}$ which is independent of initial concentration ${[A]}_{0}$ .

For second order reaction, $t_{1 / 2} = \frac{1}{k {[A]}_{0}}$

Half-life depends on initial concentration of reactant.