Which of the following is an example of multimolecular colloids?

Which of the following is a positively charged sol?

The charge of $SnO_2$-sol in alkaline and acidic medium are respectively (Hint: $SnO_2$ is amphoteric oxide).

Which of the following processes does $NOT$ result in coagulation?

Match List $I$ with List $II$:

List $I$	List $II$
$(A)$. Brownian Motion	$(I)$. Removal of impurities from the colloidal sols using a semipermeable membrane.
$(B)$. Tyndall Effect	$(II)$. Movement of colloidal particles under the influence of an electric field.
$(C)$. Electrophoresis	$(III)$. Random movement of colloidal particles due to kinetic energy.
$(D)$. Dialysis	$(IV)$. Scattering of light by colloidal particles

How are colloids classified on the basis of
$(i)$ physical states of components
$(ii)$ nature of dispersed phase and
$(iii)$ interaction between dispersed phase and dispersion medium?