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The Wilfley table and hydraulic separation methods of concentration are both based on which principle?
ADifference in magnetic nature of particles
BDifference in weight of particles (gravitation)
CDifference in wetting by oil and water
DDifference in solubility in a solution
Answer & Solution
Correct answer: B. Difference in weight of particles (gravitation)
1. Both the Wilfley table and hydraulic methods use flowing water to separate particles.
2. Heavier ore particles are retained while lighter gangue is washed away.
3. This separation by weight relies on the law of gravitation.
4. Magnetic nature applies to magnetic separation, and oil-wetting applies to froth floatation, so those are wrong.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 8 "Metallurgy", p.109_
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