Question

discuss the formation of oxide ion.explain the formation by using diagram.​

Answer 1

Explanation:

The formation of the oxide ion, O

(g)

2−

, from oxygen atom requires first an exothermic and then an endothermic step as shown below:

O

(g)

+e

−

→O

(g)

−

;ΔH

∘

=−141kJmol

−1

O

(g)

−

+e

−

→O

(g)

2−

;ΔH

∘

=+780kJmol

−1

Thus, 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:

• Electron repulsion outweights the stability gained by achieving noble gas configuration.

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