In which of the following reactions, the underlined substance has been reduced?

Chemistry · Class 11 · CBSE — Redox Reactions

1. CO + CuO → CO₂ + Cu

2. CuO + 2HCl → CuCl₂ + H₂O

3. 4H₂O + 3Fe → 4H₂ + Fe₃O₄

4. C + 4HNO₃ → CO₂ + 2H₂O + 4NO₂

Answer

(A) CO + CuO → CO 2 + Cu

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