Detergent action of soap is due to

State the $Hardy-Schulze$ rule.

When a colloidal solution is observed under an ultramicroscope,we can see ..........

Which of the following statements is incorrect?

In the preparation of ice cream,gelatin is often added as an ingredient for:

Choose the correct reason$(s)$ for the stability of the lyophobic colloidal particles.
$(A)$ Preferential adsorption of ions on their surface from the solution.
$(B)$ Preferential adsorption of solvent on their surface from the solution.
$(C)$ Attraction between different particles having opposite charges on their surface.
$(D)$ Potential difference between the fixed layer and the diffused layer of opposite charges around the colloidal particles.