Q. When copper pyrites is roasted in excess if air, a mixture of $CuO + FeO$ is formed .FeO is present as impurities. This can be removed as slag during reduction of CuO. The flux added to from slag is
A) $SiO_{2}$ which is an acid flux
B) Lime stone, which is a basic flux
C) $SiO_{2},$which is basic flux
D) CaO, which is basic flux
Explanation
(a)
The compounds which combine with impurities preseore (at high temperature) and remove them as a fls substance (slag) are known as flux. When basic impurities are present, an acidic flux is used and $vice - versa$
$FeO\ \ \ \ \ \ \ \ + \ \ \ \ \ \ \ SiO_{2}\ \ \ \ \ \ \rightarrow \ \ \ \ \ FeSiO_{3}$
Basic impurity acidic flux slag
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.