Question

An ore after levigation is found to have basic impurities. Which of the following can be used as flux during smelting ?

• A. $H_2SO_4$
• B. $CaCO_3$
• C. $SiO_2$
• D. Both $CaO$ and $SiO_2$

Answer 1

Answer: (C)

$SiO_2$

Answer 2

Silica $SiO_{2}$ being'acidic flux removes the basic impurities