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Question: Answered & Verified by Expert
If decomposition of hydrogen peroxide is a first order reaction, it's rate law equation can be represented as
ChemistryChemical KineticsMHT CETMHT CET 2021 (23 Sep Shift 1)
Options:
  • A $\mathrm{r}=\frac{\mathrm{k}}{\left[\mathrm{H}_2 \mathrm{O}_2\right]}$
  • B $\mathrm{r}=\mathrm{k}\left[\mathrm{H}_2 \mathrm{O}_2\right]$
  • C $\mathrm{r}=\mathrm{k} \frac{\left[\mathrm{H}_2 \mathrm{O}\right]\left[\mathrm{O}_2\right]^{1 / 2}}{\left[\mathrm{H}_2 \mathrm{O}_2\right]}$
  • D $\mathrm{r}=\mathrm{k} \frac{\left[\mathrm{H}_2 \mathrm{O}_2\right]}{\left[\mathrm{H}_2 \mathrm{O}_2\right]\left[\mathrm{O}_2\right]^{1 / 2}}$
Solution:
1390 Upvotes Verified Answer
The correct answer is: $\mathrm{r}=\mathrm{k}\left[\mathrm{H}_2 \mathrm{O}_2\right]$
$$
\mathrm{H}_2 \mathrm{O}_2 \longrightarrow \mathrm{H}_2 \mathrm{O}+\frac{1}{2} \mathrm{O}_2
$$
Reaction is first order reaction.
Rate law equation can be represented as,
$$
\mathrm{R}=\mathrm{k}\left[\mathrm{H}_2 \mathrm{O}_2\right]^1
$$

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