The charge on colloidal particles can be determined by $......$.

When a strong beam of light is passed through a colloidal solution,the light will

Bleeding is stopped by the application of ferric chloride. This is because

If the dispersed phase is a liquid and the dispersion medium is a solid,the colloid is known as

The density of gold is $19 \, g/cm^3$. If $1.9 \times 10^{-4} \, g$ of gold is dispersed in $1 \, L$ of water to form a sol of spherical gold particles of radius $10 \, nm$,find the number of gold particles per $nm^3$ in the sol.

When a colloidal solution is observed under a microscope,we can see: