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Class 10ScienceChemical Substances – Nature and BehaviourChemical Reactions and EquationsMedium
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What is the identity of the gas formed at the anode during electrolysis of water?

Answer and explanation

Correct answer: Oxygen

During electrolysis, water decomposes according to 2H₂O → 2H₂ + O₂. Oxide ions or water molecules are oxidised at the anode, producing oxygen gas, while hydrogen is formed at the cathode. The collected hydrogen volume is twice the oxygen volume. Therefore oxygen is the gas at the anode, making option A correct; nitrogen and carbon dioxide are not products of water electrolysis.

Related tags

ScienceClass10ElectrolysisAnodeChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourClass 10 Mcq
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10 more MCQs
  1. 1What is the process called when one or more substances form new substances with different properties?
  2. 2Which of the following observations can be a common sign that a chemical reaction has occurred?
  3. 3What are the substances written on the left side of the arrow in a chemical equation called?
  4. 4What are the substances written on the right side of the arrow in a chemical equation called?
  5. 5Balancing a chemical equation is based on which law?
  6. 6What must be the same on the reactant and product sides of a balanced chemical equation?
  7. 7When two or more reactants combine to form a single product, what type of reaction is it?
  8. 8Calcium oxide reacts with water to form calcium hydroxide. What type of reaction is this?
  9. 9When a compound breaks down into two or more simpler substances, what type of reaction is it?
  10. 10When calcium carbonate is heated, it forms calcium oxide and carbon dioxide. What type of reaction is this?
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