Question
Chemistry Question on General Principles and Processes of Isolation of Elements
Limestone is used as a flux in the extraction of
A
iron
B
alumunium
C
zinc
D
copper
Answer
iron
Explanation
Solution
Limestone is used as a flux in the extraction of iron because it decomposes in hot furnace to form calcium oxide and carbon dioxide. The formed calcium oxide actually acts as flux and combined with silica to form fusible calcium silicate slag