For the given question numbers, two statements are given one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes(i), (ii), (iii) and (iv) as given below- (1)
Assertion: While dissolving an acid water, the water an acid in must always be water is a added slowly to acid highly with constant exothermic stirring.
Reason: in Dissolving an acid in water is a exothermic reaction.

Options

A. Both A and R are true and R is correction explanation of the assertion.
B. Both A and R are true and R is not the correct explanation of the assertion
C. A is true but R is false
D. A is false but R is true

Explanation

To solve the question regarding the Assertion (A) and Reason (R), we need to analyze both statements carefully.

### Step-by-Step Solution:

1. **Understanding the Assertion (A)**:
- The assertion states: "While dissolving an acid in water, the water must always be added slowly to acid with constant stirring."
- This is a true statement. When mixing water and a concentrated acid, it is crucial to add water to acid slowly to prevent violent reactions and potential splattering or explosions.

2. **Understanding the Reason (R)**:
- The reason states: "Dissolving an acid in water is an exothermic reaction."
- This statement is also true. The process of dissolving an acid in water releases heat, indicating that it is an exothermic reaction.

3. **Evaluating the Relationship**:
- While both statements are true, we need to determine if the reason provided is a correct explanation for the assertion.
- The assertion emphasizes the method of adding water to acid to ensure safety, while the reason discusses the nature of the reaction (exothermic). The reason does not explain why the water should be added slowly.

4. **Conclusion**:
- Both the Assertion (A) and Reason (R) are true, but the Reason (R) is not a correct explanation of the Assertion (A).

### Final Answer:
- The correct answer is: (ii) Both A and R are true, but R is not the correct explanation of A.