Assertion :22.4 litres of sulphur dioxide at STP weighs 64 grams. Reason: 1 mole of sulphur dioxide is 64 grams.

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.
1 mole of a gas at STP is equal to 22.4 litres.

$22.4 L$ of $S O_{2} = 1$ mole of $S O_{2} =$ Molecular mass of $S O_{2} = 64 g$

Therefore, $1$ mole of $S O_{2}$ weighs $64 g$

Hence, both assertion and reason are correct and the reason is the correct explanation of assertion.

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