alleryFroth flotation method is used to concentrate ores that are
AOxide ores wetted by water and not by oil
BSulphide ores wetted by oil and not by water
CMagnetic ores attracted by a strong magnet
DCarbonate ores soluble in dilute acid only
Answer & Solution
Correct answer: B. Sulphide ores wetted by oil and not by water
1. Froth flotation uses oil and air with a frothing agent.
2. Sulphide particles stick to oily froth and float.
3. Heavy gangue settles at the bottom.
4. So sulphide ores are concentrated by this method.
_Source: Selina Concise Chemistry Class 10, Ch 7 Metallurgy (Mistral OCR'd PDF), section on froth flotation_
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