1.

The process requiring absorption of energy is:

Answer»

`N to N^(-)`
`F to F^(-)`
`Cl to Cl^(-)`
`H to H^(-)`

Solution :Nitrogen has stable `2p^(3)` CONFIGURAITON and also due to HIGH `e^(-)` charge density at outermost orbital it requires energy to add one EXTRA `e^(-)` in its outer most shell i.e., its first electron gain enthalpy is positive.


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