GK QUESTION#3405
In classifying colloids into types such as sols, gels and foams, which basis is used?
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Answer
B. On the basis of the physical state of the dispersing medium and dispersed phase
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Explanation
In the phase-based classification into sols, gels, foams and aerosols, both the physical state of the dispersed phase and that of the dispersion medium are considered. For example, gas in liquid forms a liquid foam, while liquid in gas forms an aerosol. Colloids can also be classified in other ways, such as by charge or solvent affinity.