JEE Mains · Chemistry · STD 12 - 3. Chemical kinetics
\(\mathrm{r}=\mathrm{k}[\mathrm{A}]\) for a reaction, \(50 \%\) of \(\mathrm{A}\) is decomposed in\(120\) minutes. The time taken for \(90 \%\) decomposition of \(\mathrm{A}\) is _______ minutes.
- A \(390\)
- B \(399\)
- C \(499\)
- D \(490\)
Answer & Solution
Correct Answer
(B) \(399\)
Step-by-step Solution
Detailed explanation
\({r}=\mathrm{k}[\mathrm{A}]\) So, order of reaction \(=1\) \({t}_{1 / 2}=120 \mathrm{~min}\) For \(90 \%\) completion of reactio \(\Rightarrow \mathrm{k}=\frac{2.303}{\mathrm{t}} \log \left(\frac{\mathrm{a}}{\mathrm{a}-\mathrm{x}}\right)\)…
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