Question

In a hydrogen-oxygen fuel cell, combustion of hydrogen occurs to:-

Options

• Produce high purity water

• Created defection difference between two electrodes

• Generated heat

• Remove absorbed oxygen form electron surface

Answer 1

Created defection difference between two electrodes

Explanation:

\[\ce{Cathode: O2(g) + 2H2O(l) + 4e- -> 4OH- (aq)}\]
\[\underline{\ce{Anode: 2H2(g) + 4OH- (aq) -> 4H2O(l) + 2e-}}\]

\[\underline{\ce{Overall: 2H2(g) + O2(g) -> 2H2O(l)}\phantom{...........}}\]

Due to potential difference between cathode and anode, production of electricity is possible.