When a freshly precipitated substance is converted into a colloidal solution with the help of a third substance,the process is known as

Gelatin is mostly used in making ice cream in order to

At the critical micelle concentration $(CMC)$ the surfactant molecules

Match the following:

List-$I$ (Colloidal solution)	List-$II$ (Use)
Colloidal antimony	$I$. Kala-azar
Argyrol	$II$. Eye lotion
Colloidal gold	$III$. Intramuscular injection
Milk of magnesia	$IV$. Stomach disorders

The correct answer is

Explain the Tyndall effect.

Consider the following statements about the Tyndall effect:
$(I)$ It is used to distinguish between a true solution and a colloidal solution.
$(II)$ It is possible only when the refractive indices of the dispersed phase and the dispersion medium differ significantly.
$(III)$ It is observed only when the size of the colloidal particles is much smaller than the wavelength of the light used.
Which of the following statements are correct?