InterviewSolution
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InterviewSolution
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(a) Duringroastingmost ofthe metalsare convertedinto theirrespective oxideswhicharethen reducedto thecorrespondingmetals byusingsuitablereducingagents. However,it has beenseenthatinsomecases,insteadofthe metal oxide,it isthemetalwhich is isolated. Readtheabovepassageandanswerthe followingquestions : (i) Nametwometalsulphideswhich areconvertedintothecorrespondingmetalsduring roasting. When does ithappen so ?(ii) Name twometalsulphideswhich getconvertedintothecorrespondingmetalsduring roasting. Whendoes it happen so ? (b) What isa flux ? Whatistherole ofa fluxin teh metallurgyof ironandcopper ? (c ) Howiswroughtiron different from steel ? |
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Answer» Solution : (a) (i) Metalswhoseoxidesare morestablethantheirsulphides, GET OXIDISEDTO thecorrespondingmetaloxidesduringroasting.Forexample, `2 ZnS(s)+3 O_ 2 (g)TO2 ZnO(s)+2 SO_ 2 (g) ` `2 PbS (s)+3 O_2(g)to2 PbO(s)+2 SO_2 (g) ` (ii) Metalswhoseoxides are unstabletowardsheat,directlygetconvertedto thecorrespondingmetalsduringroasting. Alternatively,duringroasting, apartofthesesulphidesare firstoxidisedto theirrespective oxideswhich furtherreactwithmoreofthesulphideoretoyieldthe metal. Forexample, ` HgS(s)+O_ 2(g)toH g (l) +SO_2 (g) ` Alternatively, `2 HgS(s)+2 SO_2 (g) ` `2 HGO (s)+HgS (l) to3 Hg(l) +SO_2 (g ) ` and` 2 Cu_2 S(s)+ 3O_ 2 (g) to2 Cu_ 2 O(s)+2 SO_ 2 (g) ` `2 Cu_2O (s)+ Cu_2S (s) to6 CU (l)+ SO_ 2 (g) ` |
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