Question

Which of the following graphs represents exothermic reaction?

• A. (I) only
• B. (II) only
• C. (III) only
• D. (I) and (II)

Answer 1

Answer: (A)

(I) only

For exothermic reaction, $△H=-ve$

$△H=E_{a\left(forwardreaction\right)}-E_{a\left(backwardreaction\right)}$

In the case of an exothermic reaction, the reactants are at a higher energy level as compared to the products. It is observed in graph 1.

Hence, the correct answer is option $\text{A}$.