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What do you meant by colloidal solution?
 Substances such as sugar, salt when put in water get dissolved completely and form a homogenous solutions. This means that the molecules of sugar are dispersed uniformly in water. The solute particles in this case are of molecular size, invisible and do not settle on standing. Such solutions are termed as true solutions. There are substances such as sand when put in water does not dissolve and settle down on standing for some time. The particles are large enough and are visible to naked eye. They can be very easily separated from water. Such solutions are termed as suspensions and are heterogenous in nature. In between, there are particles which are bigger in size than molecules and smaller than suspension particles and are visible under a powerful microscope. Such particles belong to a state termed as colloidal state. These colloidal particles when placed in water form colloidal solutions.


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