The correct option is D An ordinary filter paper can stop the flow of colloidal particles.
Ordinary filter paper cannot stop the flow colloidal particles.
An ultra - filter paper is required to filter colloids.
Hardy-Schulze Rule:
Greater the valence of flocculating ion added, greater is its power to cause coagulation. Thus, statement (a) is correct.
Under ultramicroscope, colloidal particles appear to be in a continuous zig-zag motion known as Brownian movement.
Thus, statement (b) is correct.
Colloidal solution shows colligative properties.
Hence, option (c) is the correct answer