Which one of the following is not a colloidal solution?

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

Colloidal solution of arsenious sulphide is coagulated by

Consider the following statements for a gold sol:
$(I)$ It is a macromolecular colloid.
$(II)$ It is a lyophobic sol.
$(III)$ It is a negatively charged sol.
$(IV)$ It is a multimolecular colloid.
$(V)$ It is an associated colloid.
The correct statements are:

The protecting power of lyophilic colloidal sol is expressed in terms of

The Brownian movement exhibited by colloidal particles is a ....... property.