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

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

Particles are uniformly distributed throughout the solution
Colloidal solution is homogenous in nature
They show Tyndal effect
They do not settle down when kept undisturbed
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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