Which one of the following reactions is an example of decomposition reaction?
CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g)
2AgCl(s) Sunlight → 2Ag(s) + Cl₂(g)
CuO + H₂ Heat → Cu + H₂O
Fe(s) + CuSO₄(aq) → FeSO₄(aq) + Cu(s)
Answer is Right!
Answer is Wrong!
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UPSC NDA-1 – 2022
Option B, $2\text{AgCl(s)} \text{ Sunlight} \rightarrow 2\text{Ag(s)} + \text{Cl}_2\text{(g)}$, shows silver chloride (a single compound) breaking down into silver and chlorine (simpler substances) upon exposure to sunlight. This is a classic example of photolytic decomposition.
Option C is a reduction reaction, specifically the reduction of copper(II) oxide by hydrogen.
Option D is a displacement reaction, where iron displaces copper from copper sulphate solution.