Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is

(A) 1:1

(B) 2:1

(C) 4:1

(D) 1:2



The electrolysis of water takes place as:


Reaction when Electrolysis of water takes place - Teachoo.jpg


  • 2 Moles Hydrogen gas
  • And 1 Mole Oxygen gas is liberated


So, the correct option is (b) 2:1

  1. Class 10
  2. Chapter 1 Class 10 - Chemical Reactions and Equations (Term 1)

About the Author

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CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo