Process of removal of gangue from the ore are based on:

differences between physical and chemical properties of the gangue and the ore

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difference between densities of gangue and ore

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difference between melting point between of gangue and ore

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all of the above

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Solution

The correct option is D all of the above
Impurities are removed prior to the extraction of metal. The process used for removal of gangue from the ore are based on the differences between physical and chemical properties of the gangue.

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