BITSAT 2018 Slot 2 Solved Paper

Potassium sulphate (K2SO4),i=3
Sodium chloride (NaCl),i=2
Urea, i=1
Glucose, i=1
Greater the value of i, greater lowering in freezing point and hence, lower will be the freezing temperature.
Therefore, K2SO4 solution has the lowest freezing point.