A) 0.233 min
B) 62.18 min
C) 112.12 min
D) 36.18 min
Correct Answer: B
Solution :
For \[20\,% complete {{\left( A \right)}_{t}}= 100-20 =80\] \[K=\frac{2.303}{t}\log \,\frac{{{\left[ A \right]}_{0}}}{{{\left[ A \right]}^{t}}}\] \[=\,\,\,\,\frac{2.303}{10}\log \frac{100}{80}=0.0223\] For \[75\,%\] complete \[{{\left[ A \right]}_{t}} =100 -75 =25\] \[K=\frac{2.303}{t}\log \,\frac{100}{25}\] \[t=\frac{2.303}{0.0223}\log \,\,4=62.18\,\,\min \]
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