Question

Which is not a basic flux ?
(a) CaCO₃
(b) Lime
(c) SiO₂
(d) CaO

Answer 1

SiO2 is an acidic flux

Acidic flux are those flux which comes from substances like Lewis acid such as SiO2,

Acidic flux is used in metal welding or extractive metallurgy or Smelting.

Silica (SiO2) is used to remove basic earthly impurities (gangue) such as lime (CaO) or MgO.

HOPE YOU UNDERSTAND

Answer 2

SiO2 is not a basic flux