Out of 1M urea solution and 1M KCI solution, which has higher freezing point ?

Out of 1 m urea solution and 1m NaCl solution which has higher freezing point ?

Out of 1 M urea and 1M KCl solution, which has higher freezing point?

Between 2M glucose solution and 1M glucose solution which one has a lower freezing point ?

Between 1M sugar solution & urea solution which has higher boiling point?

Out of the following three solutions, which has the highest freezing point and why ? (a) 0.1 M urea (b) 0.1 M BaCl_(2) (c) 0.1 M Na_(2) SO_(4)