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Chemistry · PYQ NEET UG 2018

हिन्दी

The CORRECT difference between first- and second-order reactions is that

  1. A
    the rate of the first-order reaction does not depend on reactant concentrations; the rate of a second-order reaction depends on reactant concentrations
  2. B
    the half-life of a first-order reaction does not depend on \( [A]_0 \); the half-life of a second-order reaction depends on \( [A]_0 \)
  3. C
    a first- order reaction can be catalyzed; a second-order reaction cannot be catalyzed
  4. D
    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 B

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 \( [A]_0 \).
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