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In the froth floatation process for the purification of minerals the particles float because

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In the froth floatation process for the purification of minerals the particles float because
A. they are light
B. they are insoluble
C. their surface is preferentially wetter by oil.
D. they bear an electrostatic charge.
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Correct Answer - C
The ore particles are wetted by oil and from lighter froth which may be named off.
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