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When copper pyrites is roasted in excess...

When copper pyrites is roasted in excess of air, a mixture of `CuO + FeO` is formed. `FeO` is present as impurity. This can be removed as slag during reduction of `CuO`. The flux added to form slag is

A

`SiO_2`, which is an acidic flux

B

Limestone, which is a basic flux

C

`SiO_2` which is the basic flux

D

`CaO`, which is a basic flux

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The correct Answer is:
A
`FeO + SiO_2 to Fe SiO_3`
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Extraction of copper is done using copper pyrites. After roasting, the ore is mixed with silica and coke and then smelted in a blast furnace. The matte obtained from the blast furnace is charged into a silica-lined converter. Some silica is also added, and a hot air blast is blown into the mixture to obtain blister copper, which is purified by electrorefining. Coke is added during smelting to.

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DISHA PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-EXERCISE -1: CONCEPT APPLICATOR
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