Match the items given in Column I and Column II.
`{:(,"Column I","Column II"),(A.,"Protective colloid",1.FeCl_(3)+NaOH),(B.,"Liquid-liquid colloid",2."Lyophilic colloids"),(C.,"Positively charged colloid",3."Emulsion"),(D.,"Negatively charged colloid",4.FeCl_(3)+"hot water"):}`

Answer

`A. to (2)` `B. to (3)` `C. to (4)` `D. to (1)`

Explanation

A. Lyophobic colloid (solvent hating colloid) are readily protected by small amount of electrolyte . These colloids are also stabilised by addition of lyophilic colloids which makes a protective layer around lyophobic sol. Hence, lyophilic sol are known as protective colloid.
B. Liquid-liquid colloid is also known as emulsion if they are partially miscible or immiscible liquids.
(C) When `FeCl_(3)` is added to hot water it lead to the formation of positively charged colloid.
(D) When `NaOH` is added to `FeCl_(3)` it lead to the formation of negatively charged colloid.