A) \[\approx \]3 minutes
B) \[\approx \]5 minutes
C) \[\approx \]6 minutes
D) cannot be determined
Correct Answer: B
Solution :
Given rate constant \[(K)=2.3\times {{10}^{-3}}{{\sec }^{-1}}\] From the unit of rate constant, it is clear that reaction is of \[{{I}^{st}}\] order. For \[{{I}^{st}}\] order reactions, we know that \[{{t}_{1/2}}=\frac{0.693}{K}=\frac{0.693}{2.3\times {{10}^{-3}}}\] \[=301.3\,\,\sec \approx 300\,\,\sec \] \[\approx 5\,\text{minutes}\]
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