Assertion :Relative atomic mass of chlorine is $35.5$ Reason: Chlorine is a diatomic molecule.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Chlorine has two naturally occurring isotopes i.e. $^{35} C l$ and $^{37} C l$ . By considering the abundance of these two isotopes of chlorine in nature, relative atomic mass comes out to $35.5$ ,
Hence, the assertion is correct.

The chlorine atom is very unstable when present in the monoatomic form. Hence, it combines with another atom of chlorine and exists as a diatomic molecule. But the reason given above is not the correct explanation for assertion.

Hence, option $B$ is correct.

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