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Cinnabar (HgS) and galena (PbS) on roasting often give their respective metals but zinc blende (ZnS) does not . Explain . |
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Answer» Solution :On roasting all these sulphide ores are partly converted into their RESPECTIVE OXIDES . Since the oxides of mercury and lead are unstable while that of zinc is stable , therefore , oxides of mercury and lead bring about the reduction of their respective sulphides to the CORRESPONDING metals but zinc oxide does not reduce ZnS to Zn metal `HgS + underset("(unstable)")(2 HgO) overset(Delta)(to) 3 HG+ SO_(2) ,` `PbS + underset("(unstable)")(2PbO) overset(Delta)(to) 3 Pb + SO_(2)` `ZnS + underset("(stable)") (2ZnO) to 3 Zn + SO_(2)` |
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