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Which of the following ores cannot be concentrated by hydraulic washing?

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in Chemistry – Class 12 by (188k points)
Which of the following ores cannot be concentrated by hydraulic washing?

(a) Haematite

(b) Pyrolusite

(c) Tinstone

(d) Native ores of silver

This question was posed to me in an interview.

This intriguing question originated from Concentration of Ores in division General Principles and Processes of Isolation of Elements of Chemistry – Class 12

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The correct option is (b) Pyrolusite

The best explanation: Concentration by hydraulic washing requires the ore particles to have a higher mass compared to its gangue particles. Hydraulic washing can be used for oxide ores of iron and tin such as haematite and tinstone and also for native ores of silver and gold. Pyrolusite is concentrated by magnetic separation.

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