Give examples of $O/W$ (oil-in-water) and $W/O$ (water-in-oil) emulsions.

The sol formed in the following unbalanced equation is $As_2O_3 + H_2S \rightarrow$

Suspensions are

When excess of electrolyte is added to a colloid,it

The coagulating power of electrolytes having ions $Na^{+}$,$Ba^{2+}$ and $Al^{3+}$ for arsenic sulphide sol increases in the order:

When an excess of a very dilute aqueous solution of $KI$ is added to a very dilute aqueous solution of silver nitrate,the colloidal particles of silver iodide are associated with the Helmholtz double layer in the form of: