а)1.FeS+H2=H2S+Fe
2.H2S + 2KOH = K2S+2H2O
3.K2S + PbCl2 = PbS + 2KCl
б)1.S + H2 = H2S
2.H2S + 2NaOH = Na2S + 2H2O
3.Na2S + PbCl2 = PbS +2NaCl
а)1.FeS+H2=H2S+Fe
2.H2S + 2KOH = K2S+2H2O
3.K2S + PbCl2 = PbS + 2KCl
б)1.S + H2 = H2S
2.H2S + 2NaOH = Na2S + 2H2O
3.Na2S + PbCl2 = PbS +2NaCl