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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

Lime stone, which is a basic flux

C

`SiO_2` which is basic flux

D

CaO, which is basic flux

Text Solution

Verified by Experts

The correct Answer is:
A
The compounds which combines with impurities present in ore (at high temperature) and remove them as a fusible substance (slag), are known as flux. When basic impurities are present, an acidic flux is used and vice-versa.
`underset("Basic impurity")(FeO) + underset("Acidic flux")(SiO_2) rarr underset("Slag")(FeSiO_3)`.
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