✓ Board-verified
Science · 2025 · 1 mark
Chemical Reactions and EquationsCombination and Decomposition Reactions1 markAnalyseassertion reason
CBSE 2025 · Region 1 · Set 1 · Q17
Assertion (A): Decomposition reactions are generally endothermic reactions. Reason (R): Decomposition of organic matter into compost is an exothermic…
Assertion (A) : Decomposition reactions are generally endothermic reactions.
Reason (R) : Decomposition of organic matter into compost is an exothermic process.
Official answer
(B)
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
All Chemical Reactions and Equations questions2025 question paperNCERT solutions: Chemical Reactions and EquationsPractice Chemical Reactions and Equations →
More from Chemical Reactions and Equations
- Copper powder is taken in a china dish and heated over a burner. Name the product formed and state its colour. Write the chemical equation for the…2024
- Why do we balance a chemical equation? Name and state the law that suggests the balancing of a chemical equation? Balance the following chemical…2025
- Zn+2 CH_3 COOH →(CH_3 COO)_2 Zn+H_2 The above reaction is a:2024
- Which of the following is not a thermal decomposition reaction?2024
- Example of thermal decomposition reaction are (i) 2 AgCl → 2 Ag+Cl_2 (ii) CaCO_3 → CaO+CO_2 (iii) 2 H_2 O → 2 H_2+O_2 (iv) 2 KClO_3 → 2 KCl+3 O_22025
- Which of the following is an example of a displacement reaction?2026
- Define a double displacement reaction. Write the chemical equation of a double displacement reaction which is also a (i) Neutralization reaction and…2023
- Answer the following questions in the context of electrolysis of water: Why is this reaction/process called a decomposition reaction? Giving reason…2024
CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.