alleryWhich separation method is most suitable for concentrating a light sulphide ore such as zinc blende (ZnS)?
AHydraulic separation
BMagnetic separation
CThermal decomposition
DFroth floatation
Answer & Solution
Correct answer: D. Froth floatation
1. Froth floatation works on the preferential wettability of the ore by oil and the gangue by water.
2. Lighter sulphide ores rise with the froth while heavier impurities sink.
3. Zinc blende (ZnS) is a sulphide ore, so froth floatation is used.
Magnetic separation needs the ore or gangue to be magnetic, which ZnS is not.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 8 Periodic Classification of Elements "Types of Concentration of an Ore", p.120_
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