Question

in electrolysis of water, why is the volume of gas collected over one electrode double that of the other electrode ?​

Answer 1

Answer:

As you can see that water splits in to 2 molecules of Hydrogen and 1 molecule of Oxygen. ... Hence, electrode at which Hydrogen gas is collected (Cathode) shows double the volume than the electrode at which Oxygen gas is collected (Anode).

Explanation:

Answer 2

Hii

Here is your answer -

During electrolysis of water, dissociation of H(2)O occurs into H(+) and O(2-) ions.

Reactions occuring at two electrodes are as follows:

Cathode : 4H(+) + 4 electrons = 2H(2)

Anode: 2O(2-) = O(2) + 4 electrons

As it can be easily noted for one mole O(2) gas released at anode 2 moles of H(2) is released at cathode.

This is due to their respective valencies. Electrons released at each end must be balanced for each cycle and hence difference in volume of gases released.