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Q.

_________ ore cannot be concentrated by hydraulic washing.

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a

Tinstone

b

Pyrolusite

c

Native ores of silver

d

Hematite

answer is B.

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Detailed Solution

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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