JEE Main · 2020 · 04 Sep 2020 · Shift 2 · Surface Chemistry

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A sample of red ink (a colloidal suspension) is prepared by mixing eosine dye, egg white, HCHO and water. The component which ensures stability of the ink sample is :

(A)Egg white✓ Correct
(B)HCHO
(C)Water
(D)Eosin dye

Answer: (A)

Solution

A colloid is kept from coagulating by a protective colloid that coats the dispersed particles. In this red ink the egg-white protein adsorbs onto the surface of the eosin dye particles and forms a protective layer that stops them aggregating, so it is the egg white that gives the sol its stability. The formaldehyde merely acts as a preservative, water is only the dispersion medium and the eosin dye is the dispersed phase.

JEE Main · 2020 · 04 Sep 2020 · Shift 2 · Single correct option

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