Question

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

Answer 1

"Colloid is not a substance but a state of substance" is a true statement. Because there are some substances which are crystalloid under certain conditions but colloid under the other, e.g., NaCl is such substance which is called a crystalloid and behaves as a crystalloid in aqueous medium. But when mixed with benzene, it behaves as colloid. So, the above statement is correct.

Moreover, the diameter of colloidal particles ranges from 1 to 1000 nm. If particle diameter is lesser than 1nm, the solution is true solution and if it is more than 1000 nm, the solution is a suspension.

The colloidal state is an intermediate state between these two.