JEE Main · 2021 · 17 Mar 2021 · Shift 1 · Surface Chemistry

A colloidal system consisting of a gas dispersed in a solid is called a/an:

(A)gel
(B)aerosol
(C)solid sol✓ Correct
(D)foam

Answer: (C)

Solution

A colloidal system is classified based on the dispersed phase and dispersion medium. When a gas is dispersed in a solid, it is called a solid sol. Examples include pumice stone and foam rubber. Note: A gel is solid dispersed in liquid, an aerosol is liquid or solid dispersed in gas, and a foam is gas dispersed in liquid.

JEE Main · 2021 · 17 Mar 2021 · Shift 1 · Single correct option

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