Indicate the reactions which take place at cathode and anode in fuel cell.

Explanation

`{:("At cathode:",O_(2)(g)+2H_(2)O+4e^(-)rarr 4OH^(-)(aq)),("At anode :",2H_(2)(g)+4OH^(-)(aq)rarr 4H_(2)O+4e^(-)):}`
The overall reaction is : `2H_(2)(g)+O_(2)(g)rarr 2H_(2)O(l)`