Which one of the following is NOT an example of colloids?

[amp_mcq option1=”Milk” option2=”Jelly” option3=”Tincture of iodine” option4=”Fog” correct=”option3″]

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UPSC Geoscientist – 2020

Tincture of iodine is NOT an example of a colloid; it is a true solution.

A colloid is a heterogeneous mixture where the solute particles are dispersed uniformly throughout the solvent. The particle size in colloids is typically between 1 nm and 1000 nm. True solutions have particle sizes smaller than 1 nm.

Milk is an emulsion (liquid dispersed in liquid). Jelly is a gel (solid dispersed in liquid). Fog is an aerosol (liquid dispersed in gas). All of these are types of colloids. Tincture of iodine is a solution of iodine in alcohol, where iodine dissolves completely forming a homogeneous mixture at the molecular level.

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