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Which of the following is exothermic in nature?

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$N a (g) + e^{-} \to N a^{-} (g)$

$N e (g) + e^{-} \to N e^{-} (g)$

$N (g) + e^{-} \to N^{-} (g)$

$O^{-} (g) + e^{-} \to O^{2 -} (g)$

answer is A.

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Detailed Solution

$\begin{array}{l} N a (g) + e^{-} \to N a^{-} (g) \\ R e s t B, C a n d D a r e e n d o t h e r m i c \end{array}$

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