Chemistry · PYQ NEET UG 2018
हिन्दी The CORRECT difference between first- and second-order reactions is that
- the rate of the first-order reaction does not depend on reactant concentrations; the rate of a second-order reaction depends on reactant concentrations
- the half-life of a first-order reaction does not depend on \( [A]_0 \); the half-life of a second-order reaction depends on \( [A]_0 \)
- a first- order reaction can be catalyzed; a second-order reaction cannot be catalyzed
- the rate of a first-order reaction depends on reactant concentrations; the rate of a second-order reaction does not depend on reactant concentrations
Correct answer · Option 2
the half-life of a first-order reaction does not depend on \( [A]_0 \); the half-life of a second-order reaction depends on \( [A]_0 \)
Explanation
For a first-order reaction, \( t_{1/2} = \frac{0.693}{k} \), which is independent of initial concentration \( [A]_0 \). For a second-order reaction, \( t_{1/2} = \frac{1}{k[A]_0} \), which depends on \( [A]_0 \).