JEE Main · 2019 · 11 Jan 2019 · Shift 1 · Surface Chemistry

An example of solid sol is:

(A)Paint
(B)Gem stones✓ Correct
(C)Butter
(D)Hair cream

Answer: (B)

Solution

A solid sol is a colloid of solid particles dispersed through a solid medium. Coloured gemstones are exactly this: tiny metal or metal-oxide particles trapped in a solid glassy or crystalline matrix, which is what lends them their colour. Paint is a liquid sol, butter is a gel and hair cream is an emulsion, so the solid sol among these is the gemstone.

JEE Main · 2019 · 11 Jan 2019 · Shift 1 · Single correct option

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