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Class 10ScienceChemical Substances – Nature and BehaviourChemical Reactions and EquationsExpert
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At which electrode is the gas with greater volume obtained during electrolysis of water?

Answer and explanation

Correct answer: Cathode

In electrolysis of water, hydrogen gas is formed at the cathode and oxygen gas at the anode. From the balanced equation \(2H_2O \rightarrow 2H_2 + O_2\), the volume ratio of hydrogen to oxygen is \(2:1\). Therefore, the greater volume of hydrogen is obtained at the cathode. Oxygen forms at the anode, but its volume is half that of hydrogen. Exam tip: Remember: \(H_2\) at the cathode and \(O_2\) at the anode.

Related tags

Class 10 ScienceElectrolysis Of WaterChemical ReactionsCathodeHydrogen GasGas Volume Ratio
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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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