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Question

Removal of impurities from ore is known as


A

Crushing and grinding

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B

Concentration of ore

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C

Minerals

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D

Gangue

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Solution

The correct option is B

Concentration of ore


Metallurgy is the process of obtaining metals or minerals from their ores. The process of removal of impurities from ore is known as the concentration of ore. The two methods for used for concentration of ore are Hydraulic Washing and Magnetic Separation.

Explanation for correct option:

(B) Concentration of ore

The impurities present in the ore is known as gangue. The removal of impurities from the ore is known as the concentration of ore.

Explanation for incorrect options:

(A) Crushing and grinding

The process of breaking the lumps of ores into small pieces using crushers or grinders is known as crushing and grinding.

(C) Minerals

Minerals are metals that exist naturally in the earth's crust.

(D) Gangue

Gangue is the term for the unwanted impurities that are present in the ore.

Therefore, the correct option is (B).


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