Question
Chemistry Question on General Principles and Processes of Isolation of Elements
In the removal of silica during smelting, the flux used is
A
ferric oxide
B
calcium oxide
C
cupric oxide
D
phosphorus pentoxide
Answer
calcium oxide
Explanation
Solution
Calcium oxide acts as a flux and combines with silica to form fusible calcium silicate slag
{CaO_{(s)} + SiO_{2(s)} ->[1123 K]\underset{\text{Calcium silicate (slag)}}{ {CaSiO_{3(s)} }} }