Assertion :Relative atomic mass of chlorine is 35.5. Reason: Chlorine gas is diatomic element.

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
Relative atomic mass of chlorine is $35.5$ . Its atomic mass is relative because chlorine exists in two isotopes having an atomic mass number of $35$ and $37$ in the ratio $3 : 1$ . This is because its relative atomic mass is $35.5$ . Chlorine exists as a diatomic element because they don't have full valence shells on their own. thus it exists to have a diatomic element to have noble gas configuration i.e complete octet. Other diatomic element are $B r, I, N, C l, H, O, F$ etc.

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Assertion: The mass of Chlorine is 35.5 u

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