1.

Electron affinity is positive when

Answer»

`O^(-)` is formed from O
`O^(2-)` is formed from `O^(-)`
`O^(+)` is formed from O
`O^(3-)` is formed from `O^(-)`

SOLUTION :`O_((G))^(-)+E^(-) to O_(g)^(2-)+E,(DeltaH=ve, "Endothermic").`


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