$\Delta$ at the rivers are formed due to:

Butter is:

During electro-osmosis of $Fe(OH)_3$ sol,

Which of the following electrolytes is least effective in causing flocculation of ferric hydroxide sol?

When a gel is left standing,it loses a small amount of liquid or water. This phenomenon is called .....

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?