JEE Main Chemistry question

Chemistry General Principles and Processes of Isolation of Elements (Metallurgy)JEE Main

Not in JEE Main or NEET syllabus

The forth-floatation process is based upon [Kerala CEE 2005]

(A)The difference in the specific gravity of ore and gangue particles
(B)The magnetic properties of gangue and ore
(C)Preferential wetting of ore particles by oilCorrect
(D)The solubility of ore particles in suitable regent

Answer: (C)

Solution

Froth flotation works precisely because sulphide ore particles are preferentially wetted by oily collectors (pine oil, cresylic acid, etc.) and so stick to air bubbles and float, while the water-wetted

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Question ID VK-145262