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Which of the following is exothermic:...

Which of the following is exothermic:

A

`N(g)+"l"e^(-)rarrN^(-)(g)`

B

`P(g)+l"e"^(-)rarrP^(-)(g)`

C

`Na(g)rarrNa^(+)(g)+l e^(-)`

D

`l e+Be(g)rarrBe(g)`

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