Chemistryhard · Past Paper
Which method is used to separate Galena (PbS) from Zinc Blende (ZnS)?
AMagnetic separation
BHand picking
CFroth flotation using depressants
DGravity separation
✓ Correct Answer: C — Froth flotation using depressants
Depressants like NaCN are used in froth flotation to selectively prevent one sulphide from forming froth while allowing the other.
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