(A): The enthalpy of neutralization of a strong acid by a strong base is a constant.
(R): The net reaction that takes place is the same.

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Both $A$ and $R$ are true and $R$ is the correct explanation

$A$ is false but $R$ is true

Both $A$ and $R$ are true but $R$ is not the correct explanation of $A$

$A$ is true but $R$ is false

answer is A.

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Detailed Solution

Enthalpy of neutralization: - It is the enthalpy charge that takes place when 1g equivalent of an acid (or base) in neutralized by $1 g$ -equivalent of a base (or acid) in dilute solution.

The enthalpy of neutralization of any strong acid and strong base is always constant, i.e. $57.1 k J$ because both the acid and base undergo complete ionization.

Hence the correct answer is (A) Both $A$ and $R$ are true and $R$ is the correct explanation.

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