Which among the following is NOT true with respect to colloidal soluti

June 1, 2025 by rawan239

Which among the following is NOT true with respect to colloidal solution ?

[amp_mcq option1=”Particles are uniformly distributed throughout the solution” option2=”Colloidal solution is homogenous in nature” option3=”They show Tyndal effect” option4=”They do not settle down when kept undisturbed” correct=”option2″]

This question was previously asked in

UPSC NDA-2 – 2023

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The statement “Colloidal solution is homogenous in nature” is NOT true.

Colloidal solutions are fundamentally heterogeneous mixtures. Although they may appear homogeneous to the naked eye because the dispersed particles do not settle out, they are heterogeneous at the microscopic level.

Properties of colloidal solutions include: they are heterogeneous; the particle size is larger than in true solutions but smaller than in suspensions (typically 1 nm to 1 $\mu$m); they exhibit the Tyndall effect (scattering of light); they undergo Brownian motion; they are generally stable and do not settle down when left undisturbed; they often carry an electric charge. Statement A is also generally not strictly true in the sense of uniform distribution like a true solution, but B is the most definitive and fundamental falsehood about the nature of colloids.

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