Assertion :Heat of neutralisation of $H N O_{3}$ and $N a O H$ is same as that of $H C l$ and $K O H$ . Reason: Both $H N O_{3}$ and $H C l$ are strong acids and $N a O H$ and $K O H$ are strong bases.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Enthalpy of neutralisation of strong acid and strong base is always constant, i.e., 57.1 kJ.
Therefore, as $H N O_{3}$ and $H C l$ are strong acids and $N a O H$ and $K O H$ strong bases, so heat of neutralisation of $H N O_{3}$ and $N a O H$ is same as that of $H C l$ and $K O H$ .

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Assertion :Heat of neutralisation of HNO3 and NaOH is same as that of HCl and KOH. Reason: Both HNO3 and HCl are strong acids and NaOH and KOH are strong bases.

Assertion :Heat of neutralisation of $H N O_{3}$ and $N a O H$ is same as that of $H C l$ and $K O H$ . Reason: Both $H N O_{3}$ and $H C l$ are strong acids and $N a O H$ and $K O H$ are strong bases.