Question

Write redox reaction between fluorine and water.

Answer 1

Redox reactions are those reactions in which oxidation and reduction reactions take place simultaneously.

Now, the reaction between fluorine and water can be written as:

$2F_2\left(g\right)+2H_{2}O\left(l\right)\to 4HF\left(aq\right)+O_2\left(g\right)$
$F=0$ $H=+1$ $H=+1$ $O=0$ $O=-2$ $F=-1$

In the above reaction, $F_2$ is getting reduced to $F^{-}$ as oxidation number is decreased from $0$ to $-1$ while $H_{2}O$ is getting oxidised as oxidation number of oxygen is increased from $-2$ to $0.$

Since oxidation and reduction reactions are taking place simultaneously, the above reaction is a redox reaction.