Question

For the reaction $A\to B+C$, the energy profile diagram is given in the figure.
The decrease in the energy of activation in the presence of catalyst is given by :

• A. $Z$
• B. $Z-P$
• C. $Y-Z$
• D. $Z-X$

Answer 1

Answer: (B)

$Z-P$

A Catalyst is a substance which acclerates the rate of a chemical reaction without undergoing any change in its chemical composition or mass during the reaction. A catalyst acclerates the rate of a reaction by lowering the activation energy.

It can be seen from the figure that in absence of catalyst, activation energy is $Z$ and in presence of catalyst, activation energy is $P$.
So, the decrease in the energy of activation in the presence of catalyst is $Z-P$.

Hence,option B is correct.