Name one reaction in which water acts (i) as an oxidising agent and (ii) as a reducing agent.

Name one reaction in which water acts (i) as an oxidising agent and (i

1.	Name one reaction in which water acts (i) as an oxidising agent and (ii) as a reducing agent.
Answer» Solution :(i) Oxidising agent. Water oxidises a number of highly electropositive METALS whose ELECTRODE potential is less than -0.83 V liberating `H_(2)` gas. For examples, sodium with `E^(@)=-2.71` reduces `H_(2)O` to `H_(2)` gas `underset("(Reductant)")(2na(s))+ underset("(Oxidant)")(2H_(2)O)(l) to 2Na^(+) (aq) + 2OH^(-)(aq)+ H_(2)(g)` (ii) Reducing agent. Water reduces a number of electronegative elements whose electrode potential is higher than +1.23 V liberating either `O_(2)` or `O_(3)` gas. For EXAMPLE, FLUORINE with `E^(@)=+2.87 V ` oxididses `H_(2)O`to `O_(2)` gas `underset("(Oxidant)")(2F_(2)(g)) + underset("(Reductant)")(2H_(2)O(l)) to O_(2)(g) + 4H^(+) (aq) + 4F^(-) (aq)`