In a typical fuel cell, the reactants (R) and products (P) are :-

1. R=H2(g), O2(g); P=H2O2(l)

2. R=H2(g), O2(g); P=H2O(l)

3. R=H2(g), O2(g), Cl2(g); P=HClO4(aq)

4. R=H2(g), N2(g); P=NH3(aq)

Subtopic:  Batteries & Salt Bridge |
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A device that converts energy of combustion of fuels, like hydrogen and methane, directly into electrical energy is known as : 

1. Fuel cell
2. Electrolytic cell
3. Dynamo
4. Ni-Cd cell

Subtopic:  Batteries & Salt Bridge |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology