First slide

General methods of extraction of elements from the earth crust

Question

In the commercial extraction of iron, roasting is adopted because

Moderate

A

It removes impurities of S, As, and Sb in the form of their elemental vapour
B

It prevents slag formation by Fe₂O₃
C

It prevents slag formation by FeO
D

Limonite is converted into its anhydrous form

Solution

During the process of roasting the metal cant be converted into its elemental form.

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