Q.The formation of $O^{2-}(g)$ from $O(g)$ is an endothermic process. This is because:

Oxygen has high electronegativity

O^-

repels the incoming second electron

The

O^{2-}

ion is smaller than

O

Effective nuclear charge is too high

The correct solution involves applying the fundamental concept to derive the final value step by step...

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Q.The formation of O2−(g)O^{2-}(g)O2−(g) from O(g)O(g)O(g) is an endothermic process. This is because: