Which of the following statements best describes the Hardy Schulze rule?
1
This is applied to obtain a colloidal solution of metals such as gold, silver or platinum.
2
The ions are removed from the solution by the phenomenon of diffusion through a permeable membrane.
3
The amount of electrolyte required for the coagulation of a definite amount of a colloidal solution is dependent on the valency of the coagulating ion.
4
The partial pressure of a component in a liquid mixture is proportional to its mole fraction in that mixture.