The given statement is true. This is because the statement may exist as a colloid under certain conditions and as a crystalloid under certain other conditions. E.g., NaCl in water behaves as a crystalloid while in benzene, behaves as a colloid (called associated colloid). It is the size of the particles which matters i.e., the state in which the substance exist. If the size of the particles lies in the range 1 nm to 1000 nm it is in the colloid state.
