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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