Properties of Colloidal Solutions

Explain the visibility of colloidal solutions.

What is streaming potential?

How coagulation can be carried out by mixing two oppositely charged sols?

Describe briefly any three methods by which coagulation of lyophobic sols can be carried out.

Describe any two methods of coagulation.

Viscosity of lyophilic colloidal solution is same as that of dispersion medium.

Which is the following is/are correct for lyophilic sols?

When milk is cooled, the protein particles coagulate and start floating on the surface.

Which particles float on the surface, when milk is cooled?

When milk is cooled, the _____ particles coagulate and start floating on the surface.

Give an example of coagulation by cooling.

On addition of $1.0 \mathrm{ml}$ solution of $10\% \mathrm{NaCl}$ to $10 \mathrm{ml}$ gold sol in the presence of$0.5 \mathrm{gm}$ of starch, the coagulation is just prevented. The gold number of starch is

How many of the following mixtures show Tyndall effect?

$\mathrm{a}.$ $\mathrm{aq}.$ $\mathrm{NaCl}$

$\mathrm{b}.$ Ferric hydroxide

$\mathrm{c}.$ $\mathrm{NaCl}$ in benzene

$\mathrm{d}.$ $\mathrm{aq}.$ urea

$\mathrm{e}.$ $\mathrm{aq}.$ starch

The coagulation of $100 \mathrm{mL}$ of colloidal solution of gold is completely prevented by addition of $0.25 \mathrm{g}$ of a substance "$\mathrm{X}$" to it before addition of $1 \mathrm{mL}$ of $10\% \mathrm{NaCl}$ solution. The gold number of "$\mathrm{X}$" is

The coagulation of $100 \mathrm{mL}$ of colloidal solution of gold is completely prevented by addition of $0.25 \mathrm{g}$ of a substance "$\mathrm{X}$" to it before addition of $1 \mathrm{mL}$ of $10\% \mathrm{NaCl}$ solution. The gold number of "$\mathrm{X}$" is

Isoelectric point refers to the ${\mathrm{H}}^{+}$ ion concentration at which, the colloidal particles

The charge on ${\mathrm{As}}_2{\mathrm{S}}_3$ sol is due to the adsorption of

Colloidal solution $\mathrm{A}\underset{\mathrm{process}}{\overset{\mathrm{Physical}}{\to }}\mathrm{B}+\mathrm{C}$. Osmotic pressure of $\mathrm{B}$ and $\mathrm{C}$ are found to be higher and lower than $\mathrm{A}$, respectively. Then