Question

Removal of impurities from ore is known as -

• A. Crushing and grinding
• B. Concentration of ore
• C. Minerals
• D. Gangue

Answer 1

The correct option is B

Concentration of ore

An explanation for the correct option (B):

• Ores are minerals from which metals can be commercially extracted at a low cost and with minimum effort. The removal of the impurities from the ore is called concentration of ore means increasing the concentration of the minerals.
• This can be done by various ways like hydraulic washing, magnetic separation, froth flotation, and leaching.

The explanation for the incorrect option:
(A) Crushing and grinding are primary steps involved in the extraction of minerals from the ores, but does not remove the impurities from the ore.

(C) Minerals are going to obtained from the ores after purification of the ore.

(D) Gangue is the unwanted material or impurity which is mixed with minerals and forms ores.

So, the correct option is (B)