Question

Find the number of compounds that form basic flux from the ones given below:
$Si{O}_2,MgO,CaO,FeO,B_2{O}_3,CaC{O}_3$

Answer 1

$B_2{O}_3+3H_{2}O\to 2\underset{orthoboricacid}{H_{3}B{O}_3}$
$\therefore B_2{O}_3$ forms an acidic flux.

$CaO+H_{2}O\to \underset{Calciumhydroxide}{Ca(OH{)}_2}$
$\therefore CaO$ forms a basic flux.

$CaC{O}_3\stackrel{△}{\to }CaO+C{O}_2$
$CaO+H_{2}O\to \underset{Calciumhydroxide}{Ca(OH{)}_2}$
$\therefore CaC{O}_3$ forms a basic flux.

$MgO+H_{2}O\to \underset{Magnesiumhydroxide}{Mg(OH{)}_2}$
$\therefore MgO$ forms a basic flux.

$\underset{\left(acidicflux\right)}{Si{O}_2}+\underset{\left(basicflux\right)}{FeO}\to \underset{\left(slag\right)}{FeSi{O}_3}$
$\therefore$$Si{O}_2$ forms an acidic flux and $FeO$ forms a basic flux.

Thus $MgO,CaO,FeO$ and $CaC{O}_3$ form basic fluxes.