CBSE Class 10 Science 2019 Outside Delhi Set 3

Question : 4

Total: 12

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

(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

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

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