Assertion :An element may have variable equivalent mass. Reason: Such elements should possess variable valency.

Assertion is correct but Reason is wrong.

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Assertion is wrong but Reason is correct.

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Both Assertion and Reason are correct and Reason is correct explanation of Assertion.

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Both Assertion and Reason are correct and Reason is incorrect explanation of Assertion.

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Solution

The correct option is C Both Assertion and Reason are correct and Reason is correct explanation of Assertion.
As we know,
$E q u i v a l e n t m a s s = \frac{m o l a r m a s s}{^{'} n^{'} f a c t o r}$
Equivalent mass is a pure number. When expressed in gram, it is called gram equivalent mass.
The equivalent mass of substance may have different values under different conditions (under variable valency).

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