Q1
1 markMCQSection A

Electrolysis of water is a decomposition reaction. The mass ratio (MH:MO)(M_H : M_O) of hydrogen and oxygen gases liberated at the electrodes during electrolysis of water is :

Chemical Reactions and Equations
Decomposition Reaction

Options

(A)8:1
(B)2:1
(C)1:2
(D)1:8
Official Answer

2H2O(l)ightarrow2H2(g)+O2(g)2H_2O(l) ightarrow 2H_2(g) + O_2(g)

electrolysiswaterhydrogenoxygenmass ratio

Marking Scheme

  • 11 mark

Hint

Recall the balanced equation for the electrolysis of water and calculate the mass ratio of hydrogen to oxygen.

Quick Oral Answer

The mass ratio of hydrogen to oxygen is 1:8.

Analysis & Explanation

The question requires the student to recall the balanced equation for the electrolysis of water and then calculate the mass ratio of hydrogen to oxygen. The student should be able to identify the coefficients of the reactants and products in the balanced equation and use them to calculate the mass ratio.

Common Mistakes

  1. 1Forgetting to balance the equation
  2. 2Incorrectly calculating the mass ratio

Interesting Facts

The electrolysis of water is a decomposition reaction.

The mass ratio of hydrogen to oxygen is 1:8.

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Frequently Asked Questions

How many marks does this question carry in CBSE Class 10 Science 2025?

This question carries 1 mark in the CBSE Class 10 Science 2025 examination.

Which chapter does this question come from in Science?

This question is from the chapter "Chemical Reactions and Equations" in the CBSE Class 10 Science syllabus.

What topic does this question cover in Science?

This question covers the topic "Decomposition Reaction" from CBSE Class 10 Science.

What type of question is this in the CBSE Class 10 Science 2025 paper?

This is a MCQ question from Section A in the CBSE Class 10 Science 2025 paper.