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

Explanation

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