Match the reagents in Group 1 with their properties in Group 2, in the context of froth floatation.

Group 1 Group 2

P. Frother 1. Alters the chemical nature of mineral surfaces so that they become hydrophobic due to action of collector

Q. Activator 2. Absorbs on air-water interface and reduces surface tension to stabilise the bubble

R. Regulator 3. Increases the selectivity of floatation by rendering certain mineral hydrophilic

S. Depressant 4. Modifies the action of collector either by intensifying or reducing its water repellant effect

A) P-2, Q-1, R-4, S-3 B) P-1, Q-3, R-2, S-4 C) P-4, Q-2, R-3, S-1 D) P-3, Q-2, R-4, S-1

Answer & Solution

Correct Answer: Option D

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Group 1	Group 2
P. Floatation	1. Separation on the basis of density difference
Q. Electrostatic concentration	2. Reduction in size
R. Comminution	3. Surface charge is induced in particles
S. Heavy media separation	4. Modification of surface tension

Group 1	Group 2
P. Frother	1. Alters the chemical nature of mineral surfaces so that they become hydrophobic due to action of collector
Q. Activator	2. Absorbs on air-water interface and reduces surface tension to stabilise the bubble
R. Regulator	3. Increases the selectivity of floatation by rendering certain mineral hydrophilic
S. Depressant	4. Modifies the action of collector either by intensifying or reducing its water repellant effect