JEE Main · 2019 · 11 Jan 2019 · Shift 2 · Surface Chemistry

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Among the colloids cheese (C), milk (M) and smoke (S), the correct combination of the dispersed phase and dispersion medium, respectively is:

(A)C: liquid in solid; M: liquid in solid; S: solid in gas
(B)C : liquid in solid; M: liquid in liquid; S: solid in gas✓ Correct
(C) $C :$ solid in liquid ; $M :$ liquid in liquid ; $S :$ gas in solid
(D)C : solid in liquid ; $M :$ solid in liquid; $S :$ solid in gas

Answer: (B)

Solution

Classifying by dispersed phase and medium: cheese is a liquid (fat and water) held in a solid protein network, a liquid-in-solid gel; milk is liquid fat dispersed in liquid water, a liquid-in-liquid emulsion; and smoke is solid particles dispersed in air, a solid-in-gas aerosol.

JEE Main · 2019 · 11 Jan 2019 · Shift 2 · Single correct option

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