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The formation of O^(2-)(g) startng from ...

The formation of `O^(2-)(g)` startng from O(g) is endothermic by `603 kJ mol^(-1)`. If electron gain enthalpy of O(g) is `-141 kJ mol^(-1)`, the second electron gain enthalpy of oxygen would be :

A

`603 kJ mol^(-1)`

B

`-603 kJ mol^(-1)`

C

`-744 kJ mol^(-1)`

D

`+744 kJ mol^(-1)`

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The correct Answer is:
D
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