Assertion : $H_{2} {S O}_{4}$ acts as a base in presence of $H C l O_{4}$ . Reason: Perchloric acid is stronger acid than $H_{2} {S O}_{4}$ .

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
Due to greater number of oxygen attached directly to central metal atom $O - H$ bond in $H C l O_{4}$ is much weaker than $O - H$ bond in $H_{2} S O_{4}$ .So $H C l O_{4}$ is stronger acid than $H_{2} S O_{4}$ and $H_{2} S O_{4}$ acts as a base in presence of $H C l O_{4}$ .

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Assertion :H2SO4 acts as a base in presence of HClO4. Reason: Perchloric acid is stronger acid than H2SO4.

Assertion : $H_{2} {S O}_{4}$ acts as a base in presence of $H C l O_{4}$ . Reason: Perchloric acid is stronger acid than $H_{2} {S O}_{4}$ .