Question 171 markMCQSection A

Assertion (A) : Decomposition reactions are generally endothermic reactions. Reason (R) : Decomposition of organic matter into compost is an exothermic process.

Chemical Reactions and Equations
Decomposition Reaction

Options

(A)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
(B)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
(C)Assertion (A) is true, but Reason (R) is false.
(D)Assertion (A) is false, but Reason (R) is true.

Official answer

Assertion (A) is false, but Reason (R) is true.

Answer keywords:decompositionreactionendothermicexothermic

Marking scheme

  1. 1.1 mark

Hint

Recall the definition of decomposition reactions and identify examples of exothermic decomposition reactions.

Quick oral answer

Assertion (A) is false, but Reason (R) is true.

Common mistakes

  1. 1.Assuming all decomposition reactions are endothermic
  2. 2.Not providing examples of exothermic decomposition reactions

Analysis and explanation

The question requires the student to analyze the assertion and reason and identify the correct answer. The student should be able to understand the concept of decomposition reactions and identify examples of exothermic decomposition reactions.

Interesting facts

Decomposition reactions can be endothermic or exothermic.

The decomposition of organic matter into compost is an exothermic process.

Question details

Q17 of 39 questions

Board
CBSE
Class
Class 10
Subject
Science
Year
2025
Section
Section A
Marks
1
Type
MCQ
Chapter
Chemical Reactions and Equations
Topic
Decomposition Reaction
Bloom's level
Analyzing
Syllabus topic
Chemical Reactions and Equations

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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.