Assertion : $S O_{2}$ contains sulphur and oxygen in the mass ratio of $1 : 2$ . Reason: Different pure substances contain the same proportions of elements by mass.

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 D Both Assertion and Reason are incorrect
Atomic weight of Sulphur and Oxygen are 32 and 16. 1 molecule of $S O_{2}$ contains 32 gm of Sulphur and 32 gm of Oxygen.
$∴$ Mass ratio of $S$ and $O$ is $1 : 1$
Each pure substance is identified by its unique proportion of elements by mass So, different pure substances can not have the same proportion of elements.
Hence, both Assertion and Reason are incorrect.

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