In a fuel cell, electrical energy is produced by
(a) Reaction of hydrogen with oxygen
(c) Combustion of fuel in the absence of oxygen.
(b) Thermionic action
(d) None of these
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Answer:
a) In a fuel cell, electrical energy is produced by the reaction of hydrogen with oxygen.
Explanation:
- A fuel cell is an electrochemical device that turns chemical energy into electrical energy.
- The oxygen is reduced at the cathode and the hydrogen is oxidized at the anode in a hydrogen-oxygen fuel cell.
- When you combine these two reactions, you get hydrogen combustion, which produces a lot of heat.
- Direct hydrogen combustion is uncontrollable, although it can be regulated to some extent using an electrochemical cell.
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