Learn reaction types and redox logic for objective accuracy.
Level
Core
Study Time
20 min
Exam Relevance
High
Core concepts
Combination, decomposition, displacement and double displacement.
Oxidation and reduction in terms of electron transfer.
Oxidizing and reducing agents.
Exam-solving method
Identify what changes (gain/loss of oxygen, hydrogen or electrons).
Separate oxidized and reduced species.
Match with reaction type options.
Common mistakes
Treating oxidation only as oxygen addition in all cases.
Misidentifying oxidizing agent.
Chapter-end mini quiz
5 quick questions from the question bank.
Question 1
The chemical reaction : 2AgCl (s) → 2Ag (s) + Cl₂ (g) takes place
Question 2
Which one of the following reactions is an example of decomposition reaction?
Question 3
Match List I with List II and select the answer using the code given below the Lists:
**List I (Reaction)** — **List II (Type)**
A. CaO (s) + H₂O (l) → Ca(OH)₂ (aq) — 1. Single displacement
B. CaCO₃ (s) → CaO (s) + CO₂ (g) — 2. Double displacement
C. Pb (s) + CuCl₂ (aq) → PbCl₂ (aq) + Cu (s) — 3. Combination
D. Na₂SO₄ (aq) + BaCl₂ (aq) → BaSO₄ (s) + 2NaCl (aq) — 4. Decomposition
Question 4
Which one of the following reactions does not result in the evolution of hydrogen gas?
Question 5
Match List I with List II and select the correct answer using the code given below the Lists:\\ List I (Chemical process): <br>A. Electrolysis of water; <br>B. Burning of coal; <br>C. Iron nail immersed in copper sulphate solution; <br>D. Addition of barium chloride solution to aluminium sulphate solution.\\ <br><br>List II (Reaction): <br>1. Double displacement reaction; <br>2. Combination reaction; <br>3. Decomposition reaction; <br>4. Displacement reaction.
Source Base
•NCERT chapters on chemical reactions and redox basics
•CBSE pattern questions on oxidation number and reaction type