Ncert Exercises & Solutions

9.19 Consider the reaction of water with F2 and suggest, in terms of oxidation and reduction, which species are oxidised/reduced.

The reaction between fluorine and water can be represented as:

$2 F_{2 (g)} + 2 H_{2} O_{(I)} \to 4 {H^{+}}_{(a q)} + 4 {F^{-}}_{(a q)} + O_{2 (g)}$

This is an example of a redox reaction as water is getting oxidized to oxygen, while fluorine is being reduced to fluoride ion.
The oxidation numbers of various species can be represented as:

Fluorine is reduced from zero to (– 1) oxidation state. A decrease in oxidation state indicates the reduction of fluorine.

Water is oxidized from (– 2) to zero oxidation state. An increase in oxidation state indicates oxidation of water.

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