Q26 / 160 · AP EAMCET 2022 (06 Jul Shift 1) · Chemistry

$\mathrm{A} \rightarrow$ 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

  • A
    $1.05 \times 10^{-2}$
  • B
    $1.15 \times 10^{-2}$
  • C
    $1.25 \times 10^{-4}$
  • Correct answer
    D
    $1.92 \times 10^{-4}$

Solution

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

Hence, the correct answer is option: 'D'.

Relevant Questions