Question

# Electron affinity is positive, when :

A
O changes to O
B
O changes into O2
C
O changes into O+
D
electron \ affinity \ is \ always \ negative

Solution

## The correct option is B $${ O }^{ - }$$ changes into $${ O }^{ 2- }$$When $${ O }^{ - }$$ changes to $${ O }^{ 2- }$$, change is endothermic because $${ O }^{- }$$ repels the incoming electron due to similar charge, hence, it needs energy to accept the electron. The second electron affinity of oxygen is particularly high because the electron is being forced into a small, very electron-dense space. So, electron affinity is positiveChemistry

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