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Redox Reactions

Fluorine reac...

Question

Fluorine reacts with ice and results in the change:
$H_{2} O (s) + F_{2} (g) \to H F (g) + H O F (g)$
Justify that this reaction is a redox reaction.

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Solution

Let us write the oxidation number of each atom involved in the given reaction above its symbol as:
$_{2} - 2 O +_{2} ⟶ + 1 H - 1 F + + 1 H - 2 O + 1 F$
Here, we have observed that the oxidation number of F increases from 0 in $F_{2}$ to +1 in HOF. Also, the oxidation number decreases from 0 in $F_{2}$ to -1. Thus, in the above reaction, F is both oxidized and reduced. Hence, the given reaction is a redox reaction.

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Redox Reactions

Standard XII Chemistry

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