For arsenious sulphide sol,which one of the following salt solutions will be most effective for coagulation?

Bredig's arc method cannot be used to prepare a colloidal solution of which of the following?

The correct statement$(s)$ related to colloids is(are):
$(A)$ The process of precipitating colloidal sol by an electrolyte is called peptization.
$(B)$ Colloidal solution freezes at a higher temperature than the true solution at the same concentration.
$(C)$ Surfactants form micelles above the critical micelle concentration $(CMC)$. $CMC$ depends on temperature.
$(D)$ Micelles are macromolecular colloids.

An ionic micelle is formed on the addition of:

Which of the following statements is not true for a lyophobic sol?

What is the range of particle size in the colloidal state?