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Question:

The idea of froth floatation method came from a person X and this method is related to the process Y of ores. X and Y, respectively, are:

washer man and reduction

washer woman and concentration

fisher woman and concentration

fisher man and reduction

Solution:

Correct option is C. washer woman and concentrationThe idea of froth floatation method came from washerwomen and this process is related to concentration of sulphide ores.