Comment on the statement that 'Colloid is not a substance but a state of substance'.

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Solution

Under one set of conditions, a substance can exist as a colloid and under different sets of conditions, the same substance can exist as crystalloid. Thus, in water, sodium chloride is a crystalloid whereas in benzene, sodium chloride is a colloid. Also, dilute soap solution is a colloid and concentrated soap solution is a crystalloid. The state of the substance depends on the size of the particles. Colloidal state has particle size in the range of $10$ nm to $100$ nm.

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