When an excess of $AgNO_3$ solution is added to a $KI$ solution,a sol is formed. The colloidal particles will carry which type of charge?

Tyndall effect is observed only when:
$(i)$ the diameter of the dispersed particles is not much smaller than the wavelength of the light used.
$(ii)$ the refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude.
$(iii)$ the size of the particles is generally between $10^{-11} \ m$ and $10^{-9} \ m$ in diameter.
$(iv)$ the dispersed phase and the dispersion medium can be seen separately in the system.

Which of the following statements is not true for a lyophilic sol?

What is the ratio of the volume of a colloidal particle $(V_c)$ to the volume of a particle in a true solution $(V_s)$?

$As_2S_3$ sol has a negative charge. Capacity to precipitate it is highest in

Explain the coagulation of lyophilic sols and the protection of colloids.