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Limestone is used as a flux in the extra...

Limestone is used as a flux in the extraction of

A

iron

B

aluminium

C

zinc

D

copper

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The correct Answer is:
A
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.
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