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  4. Assertion: Dinegative anion of oxygen ( O 2-) is quite common but dinegative anion of sulphur ( S 2-) is less common. Reason: Covalency of oxygen is two.

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Q. Assertion : Dinegative anion of oxygen $\left( O ^{2-}\right)$ is quite common but dinegative anion of sulphur $\left( S ^{2-}\right)$ is less common.
Reason : Covalency of oxygen is two.

AIIMSAIIMS 2002The p-Block Elements - Part2

Solution:

Oxygen is second most electronegative element after fluorine. So it can easily gain electrons to form dinegative anion $(O^{2-})$ while sulphur is not so electronegative element as oxygen.