1.

Assertion : Dinegativeanion of oxygen(O^(2-))is quite common but dinegativeanion of sulphur(S^(2-))is less common. Reason : Covalency of oxygen is two.

Answer»

If both the ASSERTION and reason are true andreason is CORRECT EXPLANATION of the assertion .
If both the assertion and reason are true but reason is not a correct explanation of the assertion .
If the assertion is true but the reason is false.
If both assertion and reason are false.

Solution :Oxygen is second most electronegative ELEMENT afterfluorine . So it can easily gain electrons to form dinegative ANION ` (O^(2-))`while sulphur is not so electronegative element as oxygen.


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