question_answer 67)

  Which of the following statements is false? (a) Two different solutions of sucrose of same molality prepared in different solvents will have the same depression in freezing point. (b) The osmotic pressure of a solution is given by the equation  = CRT (where, C is the molarity of the solution) (c) Decreasing order of osmotic pressure for 0.01 M aqueous solutions of barium chloride, potassium chloride, acetic acid and sucrose is                BaCI2 > KCI > CH3COOH > sucrose (d) According to Raoult's law, the vapour pressure exerted by a volatile component of a solution is directly proportional to its mole fraction in the solution

Answer:

                  (a) According to definition of depression in freezing point                       where, Kf = freezing point depression constant, value of  depends upon nature of solvent. Kf This is why although the solution have same molality two different solutions of sucrose of same molality prepared in different solvents will have different depression in freezing point.