ZnO+2 HBr--->ZnBr2+H2O
FeS
1) Fe(OH)2+H2S--->FeS+2 H2O
2) Fe+S--->FeS
3) FeO+H2S--->FeS+H2O
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ZnO+2 HBr--->ZnBr2+H2O
FeS
1) Fe(OH)2+H2S--->FeS+2 H2O
2) Fe+S--->FeS
3) FeO+H2S--->FeS+H2O