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Question

Assertion: Dinegative anion of oxygen (O2) is quite common but dinegative anion of sulfur (S2) is less common.

Reason: Covalency of oxygen is two.

A
If both assertion and reason are true and the reason is a correct explanation of the assertion
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B
If both assertion and reason are true but reason is not a correct explanation of the assertion
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C
If the assertion is true but reason is false.
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D
If both the assertion and reason are false
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E
If the assertion is false but the reason is true
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Solution

The correct option is E If both assertion and reason are true but reason is not a correct explanation of the assertion
Usually, oxygen forms 2 bonds. So the covalency of oxygen is 2 as in H2O.

Oxygen is the second most electronegative element after fluorine. So, it can easily gain electrons to form dinegative anion (O2) while sulphur is not so electronegative element as oxygen.

Therefore dinegative anion of oxygen is common because of high electron gain enthalpy.

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