Question -
Answer -
Common salt (a typicalcrystalloid in an aqueous medium) behaves as a colloid in a benzene medium.Hence, we can say that a colloidal substance does not represent a separateclass of substances. When the size of the solute particle lies between 1 nm and1000 nm, it behaves as a colloid.
Hence, we can say that colloid isnot a substance but a state of the substance which is dependent on the size ofthe particle. A colloidal state is intermediate between a true solution and asuspension.