The formation of the oxide ion, \(O ^{2-}( g )\) from oxygen atom requires first an exothermic s....

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The formation of the oxide ion, \(O ^{2-}( g )\) from oxygen atom requires first an exothermic step and then an endothermic step as shown below:.
O(g)+e-→O-(g);ΔfH°=-141kJmol-1O-(g)+e-→O2-(g);Δ1H°=+780kJmol-1Thus, process of formation of \(O ^2\) in gas phase is unfavourable even though \(O ^{2-}\) is isoelectronic with neon. It is due to the fact that, 📲PW App Link - https://bit.ly/YTAI_PWAP 🌐PW Website - https://www.pw.live



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