Assertion (A): Heat of neutralisation for both `HNO_(3)` and `HCI` with `NaOH` is `53.7 kJ per mol^(-1)`.
Reason (R ) : `NaOH` is a strong electrolyte/base.

Options

A. If both (A) and (R ) are correct, and (R ) is the correct explanation for (A).
B. If the both (A) and (R ) are correct, but(R ) is not a correct explanation for (A).
C. If (A) is correct, but (R ) is incorrect.
D. If (A) is incorrect, but (R ) is correct.

Explanation

To solve the given assertion and reason question, we will analyze both statements and determine their validity.

### Step 1: Understand the Assertion
The assertion states that the heat of neutralization for both HNO₃ (nitric acid) and HCl (hydrochloric acid) with NaOH (sodium hydroxide) is 53.7 kJ per mol.

**Explanation**:
- The heat of neutralization is the amount of heat released when an acid reacts with a base to form water and a salt.
- For strong acids (like HCl and HNO₃) reacting with a strong base (like NaOH), the heat of neutralization is typically around 57.1 kJ/mol. However, the value of 53.7 kJ/mol is often cited in literature, accounting for slight variations in experimental conditions.
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