Assertion : $p H$ value of $0.05$ M $H_{2} S O_{4}$ is equal to 1. Reason: $H_{2} S O_{4}$ is a strong acid.

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
Since $H_{2} S O$ is a dibasic acid and $H_{2} S O_{4}$ is a strong acid, therefore, it undergoes complete dissociation.

And the $p H$ value of $0.05$ M $H_{2} S O 4 = - l o g [2 \times H_{2} S O_{4}]$

$p H = - l o g (0.1)$

$p H = 1.0$

Hence the assertion is correct with the reason which is the correct explanation.

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Assertion :pH value of 0.05 M H2SO4 is equal to 1. Reason: H2SO4 is a strong acid.

Assertion : $p H$ value of $0.05$ M $H_{2} S O_{4}$ is equal to 1. Reason: $H_{2} S O_{4}$ is a strong acid.