Comment on the statement colloid is not a substance but only state of substance.

A colloid is not a substance but a state of the substance which is dependent on the size of the particle.A colloid is formed when the size of the solute particle lies between 1 nm and 1000 nm.For example: soap dissolves in water to form colloidal soap solution whereas it dissolves in alcohol to form a true solution.This shows that a substance can be brought into a colloidal state by different methods.

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