Hydraulic washing is a technique used for the concentration of ores of ____.

Aluminium

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Gold

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Iron

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Copper

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Solution

The correct option is B Gold
Hydraulic washing is a technique used when the impurities are lighter and the ore particles are heavier. The lighter impurities are removed by washing in current of water. As gold particles are heavier than the impurities like sand, we can use hydraulic washing for the concentration of ores of gold.

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