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STD 12 - 3. Chemical kinetics — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 3. Chemical kinetics4 Marks
MCQ
The correct difference between first- and second-order reaction is that
  • A
    the rate of a first-order reaction does not depend on reactant concentration; the rate of a secondorder reaction does depend 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 does depend on $[A]_0$
  • C
    first-order reaction can be catalyzed; a second-order reaction cannot be catalyzed.
  • D
    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
✓

Answer

Correct option: B.
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 $[A]_0$
b
$\left(\mathrm{t}_{1 / 2}\right) 1^{\mathrm{st}}$ order $=$ Independent of Concentration

$\left(\mathrm{t}_{1 / 2}\right) 2^{\mathrm{nd}}$ order $\propto \frac{1}{[\mathrm{A}]_{0}}$

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