Explain preparation of hydrogen using electrolysis.

1.	Explain preparation of hydrogen using electrolysis.
Answer» Solution :Hydrogen is OBTAINED by electrolysis of water. (i) Electrolyte : water containing teraces of acid or ALKALI or the electrolysis of aqueous solution of sodium hydroxide or POTASSIUM hydroxide. (II) Anode : Nickel (iii) Cathode : Iron (iv) At anode : `2OH^-toH_2O+1//2O_2+2e^-` (v) At cathode : `2H_2O+2e^-to2OH^-+H_2` (vi) OVERALL reaction : `H_2OtoH_2+1//2O_2`

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