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.