Question

in the electrolysis of water why is the volume of gas collected over one electrode is double the gas collected Over The Other electrode?

Answer 1

Dear student,
In the electrolysis of water, water get decomposed into hydrogen gas(H₂) and oxygen gas(O₂).
2 H₂O(l) → 2 H₂(g) + O₂(g)
Since in a water molecule(H₂O), 2 atoms of H and 1 atom of O is present.
By volume, amount of hydrogen is double the amount of oxygen in a molecule of water.
Hence,in the electrolysis of water the volume of H₂ gas collected over cathode is double the volume of O₂ gas collected over anode.
Regards