A) 10 min
B) 20 min
C) 30 min
D) 40 min
Correct Answer: C
Solution :
For, 1st order reaction, \[k=\frac{2.303}{t}=\log \frac{a}{(a-x)}\] Hence, \[t=\frac{2.303}{0.0693}\times \log \frac{20}{2.5}\] \[=\frac{2.303}{0.0693}\times \log \,{{(2)}^{3}}\] \[=\frac{2.303}{0.0693}\times 3\times 0.3010=30\min \]You need to login to perform this action.
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