Question

Which of the following is an example of an exothermic reaction?

• A. \( \text{H}_2 + \text{Cl}_2 \rightarrow 2 \, \text{HCl} \)
• B. \( \text{N}_2 + 3 \, \text{H}_2 \rightarrow 2 \, \text{NH}_3 \)
• C. \( \text{C}_6\text{H}_6 + 15 \, \text{O}_2 \rightarrow 6 \, \text{CO}_2 + 3 \, \text{H}_2\text{O} \)
• D. \( \text{N}_2 + 3 \, \text{H}_2 \rightarrow 2 \, \text{NH}_3 \)

Hint:

Remember: Exothermic reactions release energy, while endothermic reactions absorb energy. Combustion reactions are usually exothermic.

Answer 1

The Correct Option is A

Stage 1: Grasping exothermic reactions An exothermic reaction is a chemical process that liberates energy as heat. In these reactions, the resultant substances possess less energy than the initial substances.Stage 2: Pinpointing the exothermic reaction Considering the choices provided:- Choice (1) details the creation of hydrogen chloride, an exothermic reaction.- Choice (2) describes the synthesis of ammonia, also exothermic.- Choice (3) outlines the burning of benzene, a strongly exothermic reaction.Conclusion: Consequently, choice (1) signifies an exothermic reaction. Hence, the correct selection is option (1).