Consider the reaction of water with `F_(2)` and suggest, in terms of oxidation and reduction, which species are oxidised/reduced?

Explanation

`underset("Oxidant " " Reductant")(2F_(2)(g) + 2H_(2)O(l)) rarr O_(2)(g) + 4H^(+)(aq) + 4F^(-)(aq)`
`underset("Oxidant " " Reductant")(3F_(2)(g) + 3H_(2)O(g)) rarr O_(3)(g) + 6H^(+)(aq) + 6F^(-)(aq)`
In these reactions, water act as reductant and itself gets oxidised to oxygen or ozone. In this case, highly electronegative fluorine acts as oxidant and gets reduced to `F^(-)`.