JEE Main · 2021 · 27 Aug 2021 · Shift 1 · Surface Chemistry

Tyndall effect is more effectively shown by:

(A)suspension
(B)lyophobic colloid✓ Correct
(C)true solution
(D)lyophilic colloid

Answer: (B)

Solution

The Tyndall effect needs particles large enough to scatter light yet small enough to stay dispersed. A true solution has particles too small to scatter, and a suspension has particles so large they settle rather than scatter steadily. Among colloids, lyophobic particles are not solvated and keep a sharp difference in refractive index from the medium, so they scatter light more strongly than the heavily solvated lyophilic particles. The Tyndall effect is shown most effectively by a lyophobic colloid.

JEE Main · 2021 · 27 Aug 2021 · Shift 1 · Single correct option

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