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

Explanation

The statement, 'Colloid is not a substance but a state, of substance' is rightly said. This is because the same substance, under different conditions, may exist as a crystalloid or as a colloid
For instance, NaCl in water behaves as a crystalloid while in benzene, it behaves as a colloid. Similarly, dilute soap solution behaves as a crystalloid, while concentrated solution behaves as a colloid. It is the size of the particles that decide the state of the substance. If the particle-size lie in the range 1-1000 nm, the particles are in the colloidal state.