CBSE Class 10 Science 2019 Outside Delhi Set 3

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.

{ 2 {\ZnS}( {\ s})+3 {\O}_2( {\g}) }↙{\text "Zinc sulphide Oxygen"} {──────▶}↖{\;\text" Roasting "\;} {2 {\ZnO}( {\ s})}↙{\text "Zinc oxide"}+{2 {\SO}_2( {\g})}↙{\text "Sulphur dioxide"}

(ii) Reduction of metal oxide with carbon to get the free metal.

{ {\ZnO}( {\ s})}↙{\text "Zinc oxide"}+{ {\C}( {\ s}) }↙{\text "Carbon"}→{ {\Zn}( {\ s})}↙{\text "Zinc"}+ {{\CO}({\g})}↙{\text "Carbonmonoxide"}

(iii) Refining of impure metal to get pure metal.

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