JEE Main · 2021 · 27 Aug 2021 · Shift 2 · Surface Chemistry

Lyophilic sols are more stable than lyophobic sols because :

(A)The colloidal particles have positive charge.
(B)There is a strong electrostatic repulsion between the negatively charged colloidal particles.
(C)The colloidal particles have no charge.
(D)The colloidal particles are solvated.✓ Correct

Answer: (D)

Solution

In a lyophilic sol the dispersed particles have a strong affinity for the dispersion medium and are wrapped in a firmly held sheath of solvent molecules. This solvation layer keeps the particles apart and prevents coagulation, so such sols are stable even in the absence of any charge. The greater stability of lyophilic sols is due to the solvation of the colloidal particles.

JEE Main · 2021 · 27 Aug 2021 · Shift 2 · Single correct option

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