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Q.

The formation of the oxide ion Og2− requires first an exothermic and then an endothermic step as shown below Og  +  e−  →      Og2−;                                            ΔH=−142  kJ  mol−1Og  +  e  →      Og2−;                                               ΔH=844  kJ  mol−1This is because :

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a

O− ion has comparatively larger size than oxygen atom

b

Oxygen has high electron affinity

c

O− ion will tend to resist the addition of another electron

d

Oxygen is more electronegative

answer is C.

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Detailed Solution

O− acquires negative charge and thus shows repulsion for another electron.
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