Gravity separation method is based upon:

The preferential washing of ores and gangue particles

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The difference in densities of ore particles and impurities

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The difference in chemical properties of ore particles and impurities

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None of these

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Solution

The correct option is B The difference in densities of ore particles and impurities
Hydraulic washing or gravity seperation is based on the diffrence in the densities of the gangue and ore particles. Generally, metal ores are heavier than the gangue associated with them. When the mass is allowed to flow with water, the lighter gangue particles are washed away while the ore particles are left behind.

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