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) , C l2(g) ;   P = HClO4(aq)
4. R = H2(g) , N2(g) ;  P = NH3(aq)

Subtopic:  Batteries & Salt Bridge |
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NEET - 2020
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A device that converts the 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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From NCERT
NEET - 2015
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