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Question
Describe the role of the following in the process mentioned.
Silica in the extraction of copper.
Solution
The role of silica in the extraction of copper is to remove the iron oxide obtained during the process of roasting as slag. If the sulphide ore of copper contains iron, the silica (SiO2) is added as flux before roasting. Then, FeO combines with silica to form iron silicate, FeSiO3 (Slag).
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RELATED QUESTIONS
Roasting of sulphide ore gives the gas (A).(A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is ____________.
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Match items in Column – I with the items of Column – II and assign the correct code.
| Column – I | Column – II |
| A. Cyanide process | (i) Ultrapure Ge |
| B. Froth floatation process | (ii) Dressing of ZnS |
| C. Electrolytic reduction | (iii) Extraction of Al |
| D. Zone refining | (iv) Extraction of Au |
| (v) Purification of Ni |
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The incorrect statement among the following is
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