а) FeS + H2S → FeS2 + H2FeS2 + K2S → FeS + K2S2FeS + PbS → FeS2 + Pb
б) S + H2S → H2 + S2S2 + Na2S → 2Na2S22Na2S2 + PbS → Na2S + PbS2
а) FeS + H2S → FeS2 + H2
FeS2 + K2S → FeS + K2S2
FeS + PbS → FeS2 + Pb
б) S + H2S → H2 + S2
S2 + Na2S → 2Na2S2
2Na2S2 + PbS → Na2S + PbS2