Select the equations that represent an endoth | vedclass

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(C) $(A) \, S_{(g)}^{-} \rightarrow S_{(g)}^{2-}$: The addition of an electron to an anion is endothermic due to inter-electronic repulsion.$(B) \, Na

Vedclass · Accepted Answer

$A, C, D$

Vedclass · Answer

(C) $(A) \, S_{(g)}^{-} \rightarrow S_{(g)}^{2-}$: The addition of an electron to an anion is endothermic due to inter-electronic repulsion.$(B) \, Na_{(g)}^{+} + Cl_{(g)}^{-} \rightarrow NaCl_{(s)}$: This represents the formation of an ionic lattice,which is an exothermic process.$(C) \, N_{(g)} \rightarrow N_{(g)}^{-}$: Nitrogen has a stable half-filled $p$-subshell $(2s^2 2p^3)$. Adding an electron to it is endothermic.$(D) \, Al_{(g)}^{2+} \rightarrow Al_{(g)}^{3+}$: The removal of an electron (ionization) is always an endothermic process.

Select the equations that represent an endothermic step.

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The formation of the oxide ion $O^{2-}_{(g)}$ requires first an exothermic and then an endothermic step as shown below:
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$O^{-}_{(g)} + e^{-} \to O^{2-}_{(g)}; \Delta H = 844 \, kJ \, mol^{-1}$
This is because:

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