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CBSE Class 10 Science 2019 Outside Delhi Set 3

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Question : 4 of 12
Marks: +1, -0
Name a metal of medium reactivity and write three main steps in the extraction of this metal from its sulphide ore.
Solution:  
Zinc
The steps involved in extraction of zinc from zinc sulphide are :
(i) Roasting of sulphide ore in the presence of air to convert it into metal oxide.
2ZnS(s)+3O2(g)Zinc sulphide Oxygen→  Roasting  2ZnO(s)Zinc oxide+2SO2(g)Sulphur dioxide\underset{\text{Zinc sulphide Oxygen}}{2 \mathrm{ZnS}(\mathrm{s}) + 3 \mathrm{O}_2(\mathrm{g})} \xrightarrow{\;\text{Roasting}\;} \underset{\text{Zinc oxide}}{2 \mathrm{ZnO}(\mathrm{s})} + \underset{\text{Sulphur dioxide}}{2 \mathrm{SO}_2(\mathrm{g})}
(ii) Reduction of metal oxide with carbon to get the free metal.
ZnO(s)Zinc oxide+C(s)Carbon→Zn(s)Zinc+CO(g)Carbonmonoxide\underset{\text{Zinc oxide}}{\mathrm{ZnO}(\mathrm{s})} + \underset{\text{Carbon}}{\mathrm{C}(\mathrm{s})} \rightarrow \underset{\text{Zinc}}{\mathrm{Zn}(\mathrm{s})} + \underset{\text{Carbonmonoxide}}{\mathrm{CO}(\mathrm{g})}
(iii) Refining of impure metal to get pure metal.
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