ElectrochemistryEasy

Question

Which of the following rection is used to maker a fuel cell ?

Options

A.Cd(s) + 2Ni(OH)3(s) → CdO(s) + 2Ni(OH)2(s)H2O
B.Pb(s) + PbO2(s) + 2H2SO4(aq) → 2PbSO4(s) + 2H2O(l)
C.2H2 + O2(g) → 2H2O(l)
D.2Fe(s) + O2(g) + 4H+(aq) → 2Fe2+(aq)(l) + 2H2O(l)2PbSO4(s)

Solution

Reaction used in fuel cell is
2H2(g) + O2(g) → 2H2O(l)
At anode: [H2 → 2H+ + 2e] × 2
At cathode : O2 + 2H2O + 4e → 4OH-

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