1. CUSO4+FECL2 2. 3.2MN+2NCL≡2MNCL+N2 2FE+O2≡2FEO FEO+2HCL≡FECL2+H2O 3FECL2+2CU3PO4≡FE3(PO4)2+6CUCL 2AG+O2≡2AGO 2AGO+2HCL≡2AGCL+H2O AGCL+HNO3≡AGNO3+HCL