In `H_(2)-O_(2)` fuel cell, the reaction occurring at cathode is

Options

A. `H^(+) + e^(-) to 1/2 H_(2)`
B. `2H_(2)(g) + O_(2)(g) to 2H_(2)O (l)`
C. `H_(aq)^(+) + overset(-)OH_(aq) to H_(2)O (l)`
D. `O_(2 g) + 2H_(2)O(l) + 4e^(-) to 4 overset(-)OH_(aq)`

Answer

D

Explanation

In `H_(2)- O_(2)` fuel cell, cell reaction are
At anode `2H_(2)(g) + 4OH^(-)(aq) to 4H_(2)O (l) + 4e^(-)`
At anode : `2H_(2)(g) + 4OH^(-) (aq) to 4H_(2)O(l) + 4e^(-)`
at Cathode: `O_(2)(g) + 2H_(2)O(l) + 4e^(-) to 4OH^(-) (aq)`
Overall reaction `2H_(2)(g) + O_(2)(g) to 2H_(2)O (l)`