____ is defined as the process of getting rid of the unwanted rocky material from the ore.

Concentration

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Purification

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Dressing

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All of the above

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Solution

The correct options are
A Concentration
C Dressing
The ores are found mixed with earthy impurities like sand, clay, lime stone, etc. These unwanted impurities in the ore are called gangue or matrix. The process of removal of gangue from powdered ore is called concentration or ore dressing.

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