Question

The enthalpy (H) of an elementary exothermic reaction $A\rightleftharpoons B$ is schematically plotted against the reaction coordinates. The plots in the presence and absence of a catalyst are shown in dashed and solid lines, respectively. Identify the correct plot for the reaction:

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

For an exothermic reaction,
$△H=E_P–E_R<0$
So here,
$E_B–E_A<0E_B<E_A$
Catalyst does not change the initial and the final position of the reaction, rather it lowers the activation energy. So the correct answer is (A).