The formation of the oxide ion O 2- (g) requires first an exothermic and then an…
Chemistry · JEE Main · NTA Exams — Classification of Elements and Periodicity in Properties
The formation of the oxide ion O2-(g) requires first an exothermic and then an endothermic step as shown below:
O(g) + e- = O-(g); ΔHo = -142 kJ mol-1
O-(g) + e- = O2-(g); ΔHo = 844 kJ mol-1
This is because:
- oxygen is more electronegative
- oxygen has high electron affinity
- O- ion will tend to resist the addition of another electron
- O- ion has comparatively larger size than oxygen atom
Answer
(C) O - ion will tend to resist the addition of another electron
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