In electrolysis of acidified water

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1

In electrolysis of acidified water
why 2 vol. of hydrogen and 1 vol. of oxygen is used

2

In the electrolysis of acidified water,
Ionization of acidified water and electrode raections are as follows:
image
In the above reactions, it is clear that :
4 H+ ions gives 2 H2 molecules
and 4 OH- ions gives 1 O2 molecule and one water molecule.

In the electrolysis, H2: O2 ratio is 2:1