Cu -> CuO -> CuSO4 -> CuCl2 -> Cu(NO3)2 -> Cu(OH)2 -> CuO -> Cu

Cu → CuO → CuSO₄ → CuCl₂ → Cu(NO₃)₂ → Cu(OH)₂ → CuO → Cu

Đề bài: Cu → CuO → CuSO₄ → CuCl₂ → Cu(NO₃)₂ → Cu(OH)₂ → CuO → Cu

Lời giải:

(1) 2Cu + O₂ $\stackrel{t^{°}}{\to }$ 2CuO

(2) CuO + H₂SO₄ → CuSO₄ + H₂O

(3) CuSO₄ + BaCl₂ → BaSO₄↓ + CuCl₂

(4) CuCl₂ + 2AgNO₃ → 2AgCl↓ + Cu(NO₃)₂

(5) Cu(NO₃)₂ + 2NaOH → Cu(OH)₂↓+ 2NaNO₃

(6) Cu(OH)₂ $\stackrel{t^{°}}{\to }$ CuO + H₂O

(7) CuO + H₂ $\stackrel{t^{°}}{\to }$ Cu + H₂O.