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Question

What are 'fuel cells'? Write cathode and anode reaction in a fuel cell.

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Solution

Fuel cells:
These are galvanic cells in which the energy of combustion of fuels is directly converted into electrical energy. Commonly used fuels are hydrogen, methanol etc.
The half cell reactions in hydrogen - oxygen fuel cell are given below.
Oxidation at anode:
Hydrogen gas and hydroxide ions are oxidised to water.
2H2(g)+4OH(aq)4H2O(l)+4e
Reduction at cathode:
Oxygen gas and water molecules are reduced to hydroxide ions.
O2(g)+2H2O(l)+4e4OH(aq)

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