(i) In the electrolysis of water, the gas collected at cathode is hydrogen and the gas collected at anode is oxygen.
(ii) The gas which is collected in double the amount during the electrolysis of water is hydrogen. This is because water contains two parts of hydrogen element as compared to one part of oxygen element by volume.
(iii) Pure water is a bad conductor of electricity. By adding drops of sulphuric acid we make it a good conductor of electricity.
