Sulfide ores are usually dressed by the _____ process.

sieve process

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froth floatation

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magnetic floatation

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none of these

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Solution

The correct option is C froth floatation
Froth floatation process is based on the principle that the metallic sulphide particles of ore are preferentially wetted by oil and the gangue particles by water.
Sulphide ores being lighter are easily wetted by oil to come on the surface of solution with froths during froth floatation process, leaving behind heavy matter of gangue wetted by water.
Sulphide ores are usually dressed by froth floatation process.

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