The reason for the stability of a lyophobic sol is

Assertion : $Fe^{3+}$ can be used for coagulation of $As_2S_3$ sol.
Reason : $Fe^{3+}$ reacts with $As_2S_3$ to give $Fe_2S_3$.

The coagulation of $10 \, mL$ of gold sol is prevented by the addition of $0.025 \, g$ of starch to it before adding $1 \, mL$ of $10 \% \, NaCl$ solution. The gold number of starch is .............

Movement of colloidal particles under the influence of an electrostatic field is called:

What happens when an electric field is applied to a colloidal solution?

Jelly is a colloidal solution of