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The formation of the oxide ion O^-2 (g) ...

The formation of the oxide ion O^-2` (g) from oxygen atom requires first an exothermic and then an endothermic step as shown below `O(g)+e^-rarrO^-(g)deltaH=-141KJmol^-1`
`O^-(g)+e^-rarrO^_2(g),deltaH=+780KJmol^-1` thus process of formation of `O^_2` in gas phase is unfavourable even though `O^-2` is isoelectronic with neon it is due to the fact that

A

oxygen is more electronegative

B

addition of electron in oxygen results in larger size of the ion

C

electron repulsion outweighs the stability gained by achieving noble gas configuration

D

`O^-` ion has comparatively smaller size than oxygen atom

Text Solution

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The correct Answer is:
C
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