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Account for the following (a) Aluminium undergo slow corrosion than iron. (b) H_2 - O_2 fuel cell is more useful than other cells . |
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Answer» Solution :(a) Aluminium , copper silver also undergo corrosion but at a slower RATE than iron. For eg., let US consider the REDUCTION of Aluminium `Al_((s)) to Al_((aq))^(3+) + 3e^(-)` `Al^(3+)` which reacts with oxygen in air to form a protective coating of `Al_2O_3`. This coating act as a protective film for the inner surface . So further corrosion is PREVENTED. (b) `H_2 - O_2` fuel cell is more advanced. Because it is highly efficient. It is POLLUTION free. In this , `H_2 - O_2` fuel cell, energy of combustion of fuel is directly converted to electrical energy. |
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