Answer 1

Cell reactions in a fuel cell:

Oxidation at the anode (-):

Oxidation of hydrogen gas to water occurs at the anode.
2H_2(g) + 4OH^-_(aq) →4H₂O_(l) + 4e^-

Reduction at the cathode (+):

Reduction of oxygen gas to OH ions occurs at the cathode.
O_2(g) + 2H₂O_(l) + 4e^- → 4OH^-_(aq)