NCERT Class XII Chemistry
Chapter - General Principle of Process of Isolation of Elements
Questions with Solutions
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Question : 9
Total: 31
State the role of silica in the metallurgy of copper.
Solution:
Iron present in pyrites has greater affinity for oxygen than copper. The copper oxide formed reacts with unchanged iron sulphide to form iron oxide so, most of the iron sulphide is oxidised to ferrous oxide.
2 F e S + 3 O 2 – – – – – – – ▶ 2 F e O + 2 S O 2
Ferrous oxide combines with silica which acts as flux and forms ferroussilicate. By this reaction most of the iron is removed as slag.
F e O +
– – – – – – – ▶
Ferrous oxide combines with silica which acts as flux and forms ferroussilicate. By this reaction most of the iron is removed as slag.
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