Question

The potential energy diagram for a reaction $X$ $\to$ $Y$ is given. $A$ and $C$ in the graph corresponding to

• A. $A$ $\to$ activation energy, $C$ $\to$ $\Delta H^{{}^{\circ }}$
• B. $A$ $\to$ energy of reactants, $C$ $\to$ energy of products
• C. $A$ $\to$ $\Delta H^{{}^{\circ }}$, $C$ $\to$ activation energy
• D. $A$ $\to$ activation energy, $C$ $\to$ threshold energy

Answer 1

Answer: (A)

Activation energy is defined as the least possible amount of energy (minimum) which is required to start a reaction or the amount of energy available in a chemical system for a reaction to take place $\to$ A.
$C\to \Delta H^{\circ }$ is the difference of the forward and backward activation energies.