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Question

Earthly particles in an ore are removed from heavier metal ore using water in:

A
levigation
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B
hydraulic washing
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C
leaching
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D
gravity separation
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Solution

The correct options are
A levigation
B hydraulic washing
D gravity separation
Gravity separation/levigation / hydraulic washing: All these methods are based on the difference in densities of the metallic ore and gangue particles. Powdered ore is treated with a stream of running water when the lighter gangue particles are washed away and heavier ore particles are left behind.

In leaching, a suitable reagent (not water) only dissolves the ore leaving behind the impurities. Thus, leaching is a chemical method of separation / concentration of the ore from impurities.

Option A,B and D are correct.

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