In the Tyndall effect,colloidal particles .....

Which of the following anions has the maximum coagulating power for the precipitation of a positive sol?

Dialysis can separate

Among the following methods:
$(i)$ Addition of an electrolyte
$(ii)$ Electrophoresis
$(iii)$ Addition of a protective colloid
$(iv)$ Addition of an oppositely charged sol
the coagulation of a lyophobic sol can be carried out by:

Gold number is minimum in the case of

Identify the incorrect statement.