Question

Why is volume of gas collected at one electrode is double if another?

Answer 1

1) In the electrolysis of water, the gas collected at cathode is : Hydrogen

and at Anode is :oxygen

2)The gas which is collected in double amount during the electrolysis is Hydrogen. This is because water contains two parts of element as compared to one part of oxygen element by volume

Answer 2

The two electrodes collect H and O separately . We know that hydrogen composition in water is double than oxygen , so we find volume of gas collected in one electrode is double than volume of gas collected in another electrade .