Which experimental method and instrument are used to measure the colloidal properties of a polymer solution?

Which of the following is not an emulsion?

The 'Purple of Cassius' is:

$Fe(OH)_3$ is a positively charged sol. For its precipitation,the best precipitating agent is:

Under the influence of an electric field,the particles in a sol migrate towards the cathode. The coagulation of the same sol is studied using $NaCl$,$Na_2SO_4$,and $Na_3PO_4$ solutions. Their coagulating values will be in the order:

$A$ micelle is a.......