а) Cu -> CuO -> CuCl2 -> Cu(OH)2 -> CuSo4 -> CuCl2-> Cu(OH)2 -> CuO -> Cu

 

б) C - CO2 - CaCo3 - Ca (HCO3)2 - CaCO3 - СO2 - C

 

в) Fe - FeCl3 - Fe(OH)3 - FeOH(NO3)2 - Fe(NO3)3- Fe2O3 - Fe

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