Comment on the statement : Colloid is not a substance but it is a state of substance.

Explanation

The statement is true. Because the same substance may exist as a colloid under certain conditions and as a crystalloid under certain other conditions. For example, `NaCl` in water solution behaves like a crystalloid while concentrated solutions behaves as a colloid. It is the size of the particles which matters. That is the state in which the substance exists. If the size of the particles lies in the range 1 nm to 100 nm, it is in the colloidal state.