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  4. In a solution, size of the particles was found to be 120 nm. Thus,

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Q. In a solution, size of the particles was found to be $120\, nm$. Thus,

Surface Chemistry

Solution:

Size Less than $1\, nm$-true solution and invisible even under ultra-microscope.

Between $1\,nm$ and $100\, nm$-visible under ultramicroscope.

More than $100 \,nm$ - visible even by naked eye.

Thus, given solution with particle size $120\, nm$ is a type of suspension.