$\mathrm{A} \rightarrow$ products, is a first order reaction. The time required to decompose A to half its…

$\mathrm{A} \rightarrow$ products, is a first order reaction. The time required to decompose A to half its initial amount is 60 minutes. The rate constant of the reaction (in $\mathrm{s}^{-1}$ ) is
  1. $1.05 \times 10^{-2}$
  2. $1.15 \times 10^{-2}$
  3. $1.25 \times 10^{-4}$
  4. $1.92 \times 10^{-4}$

Solution

$\mathrm{A} \longrightarrow \mathrm{pdts}$; 1st order reaction $ k=\frac{0.693}{t_{1 / 2}}=\frac{0.693}{60 \times 60}=1.92 \times 10^{-4} \mathrm{~s}^{-1} $

Asked in: AP EAMCET 2022 (06 Jul Shift 1)

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