The INCORRECT statements below regarding colloidal solution is

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1. An ordinary filter paper can stop the flow of colloidal particles.
2. A colloidal solution shows Brownian motion of colloidal particles.
3. The flocculating power of $A{l}^{3+}$ is more than that of $N{a}^{+}$
4. A colloidal solution shows colligative properties.

The correct option is A 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 t​o 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