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Electron gain enthalpy is positive when:

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in Chemistry by (121k points)
Electron gain enthalpy is positive when:
A. `O^(-)` is formed form `O`
B. `O^(2-)` is formed from `O^(-)`
C. `O^(+)` is formed form `O`
D. electron affinity is always a negative value
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Correct Answer - B
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