• # question_answer In presence of catalyst, the activation energy is lowered by 3 kcal at $27{}^\circ C$. Hence, the rate of reaction will increase by A) 32 times           B) 243 times C) 2 times             D) 148 times

$\frac{\text{Rate in presence of catalyst}}{\text{Rate in absence of catalyst}}=\text{Anti}\,\text{log}\left[ \frac{\Delta E}{2.303\,RT} \right]$ $=\,\text{Anti}\,\text{log}\left[ \frac{3000}{2.303\times 2\times 300} \right]=148$