For, assume complete dissociation For Na2SO4;‌‌i=3,m=0.01 ‌∆Tb=iKbm ‌∆Tb=3×Kb×0.01=0.03Kb For, 0.01MKNO3; i‌=2,m=0.01 ∆Tb‌=2×Kb×0.01Kb=0.02Kb While, urea and glucose are non-electrolyte They do not dissociate into ions highest boiling point is shown by 0.01MNa2SO4(aq) solution.