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(i) Explain the preparation of hydrogen using electrolysis. (ii) Why hydrogen gas is used as fuel? |
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Answer» Solution :(i) High purity of HYDROGEN `(gt99.9%)` is obtained by the electrolysis of water containing traces of acid or alkali or electrolysis of aqueous solution of SODIUM hydroxide or potassium hydroxide using a NICKEL anode and iron cathode. This process is not economical for large scale production. At anode`: 2OH^(-)toH_(2)O+1//2O_(2)+2e^(-)` At cahotde: `2H_(2)O+2e^(-)to2OH+H_(2)` Overall reaction: `H_(2)OtoH_(2)+1//2O_(2)`. (ii) Hydrogen BURNS in air, virtually free from pollution and produces significant amount of energy. this reaction is used in fuel cells to generate electricity. `2H_(2_((g)))+O_(2_((g)))to2H_(2)O_((l))+`energy. |
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