Which of the following processes is exothermic? (a) \( \mathrm{N}^{-} \rightarrow \mathrm{N} \) ...

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Which of the following processes is exothermic?
(a) \( \mathrm{N}^{-} \rightarrow \mathrm{N} \)
(b) \( \mathrm{N} \rightarrow \mathrm{N}^{+} \)
(c) \( \mathrm{N} \rightarrow \mathrm{N}^{-} \)
(d) \( \mathrm{N}^{+} \rightarrow \mathrm{N}^{2+} \)
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