Question

Assertion : Reaction of quick lime with water is an exothermic reaction. Reason (R): A large amount of heat is evolved on the reaction of quick lime and water.

• A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
• B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
• C. Assertion (A) is true, but Reason (R) is false.
• D. Assertion (A) is false, but Reason (R) is true.

Hint:

Quicklime + Water → Slaked lime + Heat (Exothermic reaction).

Answer 1

The Correct Option is A

Concept: An exothermic reaction is one in which heat is released during the reaction. Explanation:

• Quicklime (CaO) reacts with water to form slaked lime (Ca(OH)$_2$). \[ \text{CaO} + H_2O \rightarrow \text{Ca(OH)}_2 + \text{Heat} \]
• A large amount of heat is released in this reaction.
• Therefore, it is an exothermic reaction.

Conclusion: Both the assertion and reason are true, and the reason correctly explains why the reaction is exothermic.