Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is:
You must know that during electrolysis the water decomposes to make hydrogen and oxygen gases in the ratio 2:1 by volume, respectively.
As
2H₂O (l) + Electric current → 2H₂(g) + O₂ (g)
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[B] 2:1