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£¨4£©Fe→ Fe2O3→ FeCl3→ Fe(NO3)3→ Fe(OH)3→ Fe2(SO4)3→ FeSO4→ Fe(OH)2→ Fe(OH)3→ FeCl3→ Fe(SCN)3
£¨5£©Cu → CuO→CuSO4→Cu(OH)2 → CuO → Cu→ CuCl2 → [Cu(NH3)4]SO4
£¨6£©C→ CO→ CO2 → CaCO3 → Ca(HCO3)2 → CO2→CO
£¨7£©Si→ SiO2→Na2SiO3→ H2SiO3 → SiO2→ Si(´Ö¹è)→ SiCl4→ Si (´¿¹è)→ SiO2→ SiF4
£¨8£©NH3→ N2 → NO→ NO2 → HNO3 → NO2 → N2O4
NH3→ NH4Cl→ NH3→ NH3•H2O→ (NH4)2SO4→ NH3 → NO → HNO3 → Cu (NO3)2 →
NO2 → HNO3 →

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£¨1£©CH3CH3→CH3CH2Cl→CH2==CH2→CH3CH2OH→CH2==CH2→CH3CH2Br→CH3CH2OH→CH3CHO →CH3COOH→CH3COOCH2CH3→CH3CH2OH→CH2==CH2→-CH2£­CH2—
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