A. Electrolysis of water involves breaking down water (a single compound) into hydrogen and oxygen (simpler substances) using electricity. This is a decomposition reaction. (H₂O → H₂ + O₂) 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)
Match List I with List II and select the correct answer using the code given below the Lists : List I List II (Chemical process) (Reaction) 1. Double dis‐
Asked in UPSC NDA 2 2023 · Topic: Physical and Chemical Changes, Solution (Definition and Characteristics of Chemical Changes (Chemical Reactions))
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Answer: C. Iron nail immersed in cop‐ 3. Decomposi‐ per sulphate solution tion reaction
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