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

(N/A) substance can behave as a colloid depending on the size of its particles. For example,common salt $(NaCl)$ acts as a crystalloid in water but behaves as a colloid in a benzene medium.
When the particle size of a substance ranges between $1 \, nm$ and $1000 \, nm$,it exhibits colloidal properties.
Therefore,a colloid is not a specific class of substances,but rather a state of matter that depends on the particle size. This state is intermediate between a true solution and a suspension.