Which one of the following is used as an acid flux in metallurgy?

Which one of the following is used as an acid flux in metallurgy?
  1. $\mathrm{CaO}$
  2. $\mathrm{SiO}_2$
  3. $\mathrm{Na}_2 \mathrm{CO}_3$
  4. $\mathrm{SO}_2$

Solution

$\mathrm{SiO}_2$ (silica) is used as an acid flux in metallurgy. It reacts with gangue to form slag.

Asked in: AP EAMCET 2004

Practice more General Principles and Processes of Isolation of Metals questions on Aicharya