Q. Sulphide ores of metals are usually concentrated by froth flotation process. Which one of the following sulphide ores offers an exception and is concentrated by chemical leaching?
A) Galena
B) Copper pyrite
C) Sphalerite
D) Argentite
Explanation
[Solution from source] Argentite (Ag₂S) is treated by leaching with dilute NaCN solution (cyanide process) to dissolve silver as [Ag(CN)₂]⁻. Galena, copper pyrites and sphalerite are concentrated by froth flotation. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.