An electric current is passed through an aqueous solution (buffered at pH = 6.0) of a alanine (pH = 6.0) and arginine (pH = 10.2). The two amino acids can be separated because

At the given pH (6) of the solution, alanine (PH = 6.0), exists as a dipolar ion while arginine (pH = 10.2) exists as a cation. Hence on passing an electric current, alanine will not migrate to any electrode, while arginine will migrate to cathode.