Comprehension Passage
Battery or cell converts chemical energy of the redox reaction to electrical energy. In fuel cell (a galvanic cell), the chemical energy of combustion of fuels like H2 , ethanol, etc. are directly converted to electrical energy. In a fuel cell, H2 and O2 react to produce electricity, where H2 gas is oxidised at anode and oxygen is reduced at cathode and the reactions involved are
Anode reaction : H2 + 2OH– -> 2H2O + 2e–
Cathode reaction : O2+ 2H2O + 4e– -> 4OH–
67.2 L of H2 at STP reacts in 15 minutes.
The number of moles of electrons produced in the oxidation of 67.2 L of H2 at STP is:
1
2 moles
2
4 moles
3
1 mole
4
6 moles