A) 1 h
B) 30 min
C) 1 h 30 min
D) None of these
Correct Answer: A
Solution :
\[k=\frac{2.303}{t}\log \frac{{{N}_{0}}}{N}\] \[=\frac{2.303}{t}\log \frac{1}{1-\frac{3}{4}}\] \[=\frac{2.303}{2}\log 4=0.693\,{{h}^{-1}}\] \[{{t}_{1/2}}=\frac{0.693}{k}=\frac{0.693}{0.693}=1\,h\]
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