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Q.

Among the following the process used for concentration of the ore based on their density property (ore, gangue

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a

Hand picking

b

Forth floatation

c

Washing

d

Magnetic separation

answer is B.

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Detailed Solution

Washing method depends on the difference  in the densities  of the ore particles and gangue particles .If the ore particles  are heavy they  can be separated from  ligthter gangue particles  by washing in steam of water.

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