The capacity to bring about coagulation increases with

According to Graham,colloids are those substances which are

Butter is:

The sky looks blue due to:

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

$100 \, cm^3$ of gold sol requires $10^{-4} \, g$ of gelatin to prevent coagulation when $1 \, cm^3$ of $10 \% \, NaCl$ solution is added. The gold number of gelatin is ............ .