A) \[10\text{ }min\]
B) \[13.58\text{ }min\]
C) \[20\text{ }min\]
D) \[160\text{ }min\]
Correct Answer: B
Solution :
Sol. \[K=\frac{2.303}{t}\log \frac{a}{(a-x)}\] \[K=\frac{2.303}{t}\log \frac{a}{(a-x)}\] \[=\frac{2.303}{40}\log 8\] \[=0.051{{\min }^{-1}}\] Now, \[{{t}_{1/2}}=\frac{0.693}{0.051}=13.58\]minute
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