Which amongst the given metals has an ore that can be concentrated by the method of hydraulic washing?
A
Aluminium
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B
Gold
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C
Iron
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D
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.