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Energy is released in the following process 

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a
Na(g) → ) Na+(g) + e
b
O-(g) + e → O-2(g)
c
O(g) +e → O- (g)
d
N-2(g) + e →N-3(g)

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detailed solution

Correct option is C

(1) IP….endothermic ;(2) , (4)…..repulsions between negative charge and added electron…endothermic ;(3)…..Electron gain enthalpy…..exothermic ;

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