JEE Main · 2004 · 24 Apr 2004 · Offline · General Principles and Processes of Isolation of Metals

Which one of the following ores is best concentrated by froth - floatation method?

(A)Magnetite
(B)Malachite
(C)Galena✓ Correct
(D)Cassiterite

Answer: (C)

Solution

Froth flotation is the method of choice for sulphide ores, because the sulphide particles are made water-repellent by the collector and ride up on air bubbles into the froth. Galena,

PbS

, is a lead sulphide and is concentrated this way. Magnetite is magnetic and separated magnetically, while malachite and cassiterite are carbonate- and oxide-type ores that flotation does not suit, so galena is the ore best concentrated by froth flotation.

JEE Main · 2004 · 24 Apr 2004 · Offline · Single correct option

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