Match List I with List II and select the correct answer using the code given below the Lists :
| List I (Chemical process) | List II (Reaction) |
|---|---|
| A. Electrolysis of water | 1. Double displacement reaction |
| B. Burning of coal | 2. Combination reaction |
| C. Iron nail immersed in copper sulphate solution | 3. Decomposition reaction |
| D. Addition of barium chloride solution to aluminium sulphate solution | 4. Displacement reaction |
Code :
| A | B | C | D | |
|---|---|---|---|---|
| (a) | 3 | 4 | 2 | 1 |
| (b) | 4 | 2 | 1 | 3 |
| (c) | 3 | 2 | 4 | 1 |
| (d) | 4 | 1 | 2 | 3 |
(a) 3 4 2 1
(b) 4 2 1 3
(c) 3 2 4 1
(d) 4 1 2 3
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC NDA-2 – 2023
B. Burning of coal involves the reaction of carbon (and other components) with oxygen, usually forming carbon dioxide. This is a combination reaction (C + O₂ → CO₂) and also combustion.
C. Iron nail immersed in copper sulphate solution involves iron displacing copper from copper sulphate because iron is more reactive than copper. This is a displacement reaction. (Fe + CuSO₄ → FeSO₄ + Cu)
D. Addition of barium chloride solution to aluminium sulphate solution involves the exchange of ions between the two reactants, forming new compounds, one of which is insoluble (barium sulphate precipitate). This is a double displacement reaction. (3BaCl₂ + Al₂(SO₄)₃ → 3BaSO₄↓ + 2AlCl₃)