MHT CET · Chemistry · Chemical Kinetics
Calculate the time required for reactant to decrease the concentration from \(100 \%\) to \(20 \%\), if rate constant of first order reaction is 0.02303 hours \(^{-1}\).
- A 28 hour
- B 42 hour
- C 56 hour
- D 70 hour
Answer & Solution
Correct Answer
(D) 70 hour
Step-by-step Solution
Detailed explanation
\(\begin{aligned} & \mathrm{kt}=\ln \frac{\left[\mathrm{A}_0\right]}{\mathrm{A}} \\ & 0.02303 \text { hour }^{-1} \times \mathrm{t}=\ln \frac{100}{20} \\ & \mathrm{t}=69.88 \text { hour } \approx 70 \text { hour }\end{aligned}\)
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