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

Options

A. `2H_(2)(g)+O_(2)(g)rarr2H_(2)(l)`
B. `O_(2)(g)+2H_(2)O(l)+4e^(-)rarr4OH(aq)`
C. `H^(+)+e^(-)rarr1/2 H_(2)`
D. `H^(+)(aq)+OH^(aq)rarr H_(2)O(l)`

Answer

A

Explanation

In `H_(2) - O_(2)` fuel cell reaction are
At anode `2H_(2)(g)+4OH(-) (aq)rarr 4H_(2)O(l)+4e^(-)`
At cathode `O_(2)(g)+2H_(2) O(l) +4e^(-) rarr4 OH^(-) (aq)`
overall reaction `2H_(2) (g)O_(2)(g)rarr 2H_(2) O(l)`