Among the given salts, aqueous solution of which salt will show maximum freezing point?

∆Tf∝number of patricles∆Tf∝1Tf so ∝=i-1n-1                           0.8=i-12-1                              i=1.8 0.2m NaCl (aq) (α = 80%) solution has 0.2 x 1.8 = 0.36 value has least among all given options, hence minimum depression in freezing point and maximum freezing point.