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Question: Answered & Verified by Expert
Rate of first order reaction $\mathrm{A} \rightarrow$ product is $0.01 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{~s}^{-1}$, calculate rate constant if concentration of reactant is $0.2 \mathrm{M}$ ?
ChemistryChemical KineticsMHT CETMHT CET 2022 (06 Aug Shift 1)
Options:
  • A $0.05 \mathrm{sec}^{-1}$
  • B $0.1 \mathrm{sec}^{-1}$
  • C $0.5 \mathrm{sec}^{-1}$
  • D $0.01 \mathrm{sec}^{-1}$
Solution:
2728 Upvotes Verified Answer
The correct answer is: $0.05 \mathrm{sec}^{-1}$
$\mathrm{r}=\mathrm{K}(\mathrm{A})$
$0.01=K(0.2)$
$\mathrm{K}=\frac{0.01}{0.20}=0.05 \mathrm{sec}^{-1}$

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