Question 11 markMCQSection A

$(M_H : M_O)$

$$2H_2O(l) ightarrow 2H_2(g) + O_2(g)$$

Chemical Reactions and Equations

Decomposition Reaction

Options

(A)

8:1

(B)

2:1

(C)

1:2

(D)

1:8

2H_2O(l) ightarrow 2H_2(g) + O_2(g)

electrolysis

water

hydrogen

oxygen

mass ratio

Hint

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

Quick oral answer

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

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.

$The electrolysis of water is a decomposition reaction.$

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

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

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

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

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