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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)} }} }