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  4. Assertion: Heat of neutralization for both HNO 3 and HCl with NaOH is 53.7 kJ / mole. Reason: NaOH is a strong electrolyte/base.

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Q. Assertion: Heat of neutralization for both $HNO _{3}$ and $HCl$ with $NaOH$ is $53.7 kJ / mole$.
Reason: $NaOH$ is a strong electrolyte/base.

AIIMSAIIMS 1997

Solution:

NaOH is a strong electrolyte and decomposes fully in solution into its ions.

$NaOH \to Na^+ + OH^-$

Due to high availability of $OH^-$ ions, both strong acids $HNO_3$ and HCl are neutralised with equal ease. So equal heat of neutralisation for both.