A) 1 hour
B) 45 minutes
C) 30 minutes
D) 15 minutes
Correct Answer: A
Solution :
\[N=\frac{25}{100}{{N}_{o}}(\text{at}\,t=2\,hr)\] Thus \[t=\frac{2.303}{0.693}\times {{t}_{1/2}}\log \frac{{{N}_{o}}}{N}\]
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