CBSE Class 12-science Answered

Colloids are classified into three types depending on the size of phase.
Multimolecular colloids: If the particle size is less than 1nm and the particles they aggregate together and form colloid size ranging between 1nm to 1000nm. Example goldsol, sulphur sol.
Macromolecular colloids: If the particle size is in between 1nm to 1000nm, generally represented by polymers for example natural starch, cellulose, proteins, enzymes, man made polythene, nylon, polystyrene. They are stable and resemble true solutions.
Associated colloids: Such colloids are formed some times in high concentration, particles aggregate to form micelles it happens above T_k called kraft temperature and critical micelle concentration (CMC) and if the concentration is low it forms true solution.