Which of the following will have the highest coagulating power for $As_2S_3$ colloid?

Which of the following is a lyophobic colloidal solution?

Dialysis can be used to separate

The coagulation of $100 \, mL$ of a colloidal sol of gold is completely prevented by the addition of $0.25 \, g$ of a substance '$X$' to it before adding $10 \, mL$ of $1 \% \ NaCl$ solution. The gold number of '$X$' is:

Identify the property of colloidal solutions where colloidal particles move freely towards respective electrodes under an applied electrical potential.

Zeta potential is