Among the following in which process energy is released. (a) N ( g ) + e − → N − ( g ) (b) Be ( g ) + e − → Be − ( g ) (c) O ( g ) + e − → O − ( g ) (d) Mg − ( g ) → Mg ( g ) + e − (e) O ( g ) → O + (

Question

Among the following in which process energy is released.

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

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

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

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

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

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

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

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

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

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

TestHub · Accepted Answer

(c) O ( g ) + e − → O − ( g ) and (j) P ( g ) + e − → P − ( g ) : The first electron affinity of oxygen and phosphorus releases energy. (d) M g − ( g ) → M g ( g ) + e − : Removing an electron from unstable M g − to form stable M g ( 3 s 2 ) releases energy. (f) O + ( g ) + e − → O ( g ) : This is the reverse of ionization, where a cation gains an electron to neutralize its charge, releasing energy. Total count = 4.00, which matches the given answer.

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