After a thorough research, the same question exists with the following choices.
(1) 0.1 mole KI
(2) 0.2 mole KI
(3) 0.1 mole MgCl2
(4) 0.2 mole MgCl2
The correct answer isĀ (4) 0.2 mole MgCl2. IN Vant Hoff factor, it is greater for MgCl2. There are more ions.