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

The formation of the oxide ion `O^(-)(g)` requires first an exothermic and then an endothermic step as shown below:
`O(g)+e^(-) to O^(-)(g) , DeltaH=-142kJ" "mol^(-1)`
`O^(-)(g)+e to O^(2-)(g),DeltaH=844kJ" "mol^(-1)`
this is because :

A

oxygen is more electronegative

B

`O^(-)` ion has comparatively larger size than oxygen atom

C

`O^(-)` ion will tend to resist the addition of another atom

D

oxygen has high electron affinity.

Text Solution

Verified by Experts

The correct Answer is:
C
This is because `O^(-)` will tend to resist the addition of another electron.
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