Question

During the formation of the slag by the reaction of flux and impurities which of the following is an example of acidic and basic flux?
(i) $FeO+Si{O}_2\to FeSi{O}_3$
(ii) $Si{O}_2+MgO\to MgO\to MgSi{O}_3$

• A. (i) $Si{O}_2$ - Acidic flux (ii) $MgO$ - Basic flux
• B. (i) $Si{O}_2$ - Basic flux (ii) $MgO$ - Acidic flux
• C. (i) $Si{O}_2$ - Basic flux (ii) $MgO$ - Basic flux
• D. (i)$Si{O}_2$ - Acidic flux (ii) $MgO$ - Acidic flux

Answer 1

The correct option is A (i) $Si{O}_2$ - Acidic flux (ii) $MgO$ - Basic flux

i) $FeO+Si{O}_2⟶FeSi{O}_3$

In it $Si{O}_2$ is acidic flux and used to remove basic impurities.

ii) $Si{O}_2+MgO⟶MgSi{O}_3$

$Si{O}_2$ is acidic impurity. $MgO$ is basic flux used to remove $MgSi{O}_3$ as slag.