Assertion :The heat of neutralisation of perchloric acid, $H C l O_{4}$ , with $N a O H$ is same as that of $H C l$ with $N a O H$ . Reason: Both $H C l$ and $H C l O_{4}$ are strong acids.

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
As we know,
Heat of neutralisation of strong acid and strong base is equal to
$- 57.3 k J m o l^{- 1}$ and $H C l O_{4}$ and $H C l$ both are strong acid.
So,
heat of neutralisation of perchloric acid, $H C l O_{4}$ , with $N a O H$ is same as that of $H C l$ with $N a O H$ .

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Assertion :The heat of neutralisation of perchloric acid, HClO4, with NaOH is same as that of HCl with NaOH. Reason: Both HCl and HClO4 are strong acids.

Assertion :The heat of neutralisation of perchloric acid, $H C l O_{4}$ , with $N a O H$ is same as that of $H C l$ with $N a O H$ . Reason: Both $H C l$ and $H C l O_{4}$ are strong acids.