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

The given problem involves evaluating both an assertion and a reason related to the chemical reaction of quick lime with water.

1. Understanding the Assertion:
   • Quick lime refers to calcium oxide (\(\text{CaO}\)).
   • When calcium oxide reacts with water, it forms calcium hydroxide (\(\text{Ca(OH)}_2\)).
   • The reaction is represented as: \(\text{CaO} + \text{H}_2\text{O} \rightarrow \text{Ca(OH)}_2\).
   • Such reactions involve the release of heat, indicating an exothermic process.
   • Thus, the assertion that the reaction of quick lime with water is exothermic is true.
2. Analyzing the Reason:
   • An exothermic reaction is one where heat is released during the process.
   • The reason states that a large amount of heat is evolved in the reaction. This is a characteristic property of the reaction between calcium oxide and water.
   • The reason correctly describes the heat evolution during this exothermic reaction.
3. Conclusion:
   • Both the assertion that the reaction is exothermic and the reason regarding the heat evolved are true.
   • Furthermore, the reason appropriately explains why the assertion is true.

Therefore, the correct answer is: Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).