Question

Limestone is used as a flux in the extraction of ______.

Options

• iron

• aluminium

• zinc

• copper

Answer 1

Limestone is used as a flux in the extraction of iron.

Explanation:

Limestone decomposes in a hot furnace to create calcium oxide and carbon dioxide, it is employed as a flux in the extraction of iron. Calcium oxide is generated and works as a flux, combining with silica to form fusible calcium silicate slag.