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Select the correct statement :
(a) \( \mathrm{O}(\mathrm{g}) \longrightarrow \mathrm{O}^{2-}(g) \) is exothermic step.
(b) \( \mathrm{Mg}^{2+}(g) \longrightarrow \mathrm{Mg}(g) \) is endothermic step.
\( \mathrm{P} \)
(c) \( \mathrm{N}(g) \longrightarrow \mathrm{N}^{-}(g) \) is endothermic step.
(d) \( \mathrm{Fe}^{2+}(g) \longrightarrow \mathrm{Fe}^{3+}(g) \) is exothermic step.
W
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