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Q.

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

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a

Haematite

b

Pyrolusite

c

Tinstone

d

Native ores of silver

answer is B.

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Detailed Solution

  • The concentration by hydraulic washing demands that the ore particles have a higher mass than the gangue particles.
  • Hydraulic washing may be used for iron oxide and tin ores such as hematite and tin as well as for native silver and gold ores.
  • For example- Haematite, Tinstone etc.
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