Question

Why hydrogen gas collected in the amount in electrolysis of water

Answer 1

Answer:

In water, that is H2O, there are 2atoms of hydrogen and one atom of oxygen in a molecule of water. Thus upon electrolysis, water molecules break into hydrogen and oxygen. ... Thus, the amount of hydrogen gas collected is always double in amount compared to the oxygen gas collected from electrolysis of water.

Answer 2

When electrolysis of H₂O occurs, the H₂O splits into H⁺ and O²⁻.

At Cathode:- Reduction occurs i.e. 2H⁺ + 2e⁻---->H₂

At Anode:- Oxidation occurs i.e. 2OH⁻--->H₂O + O₂ + 2e⁻.

One thing to be noted is that H₂ gas is collected in double the amount of O₂ gas.

Hope it helps you:)