Question

Which of the following statement is false?

• A. two sucrose solutions of same molality prepared in different solvents will have the same freezing point depression
• B. the osmotic pressure of a solution is given by the equation $\pi =MRT$ , where M is the molarity of the solution
• C. Raoult’s law states that the vapour pressure of a component over a solution is proportional to its mole fraction
• D. the correct order of osmotic pressure for 0.01 M aqueous solution of each compound is $BaC{l}_2>KCl>C{H}_{3}COOH>Sucrose$

Answer 1

Answer: (A)

Two sucrose solutions of same molality prepared in different solvents will not have the same freezing point depression as for both the solvents $K_f$ will be different so statement $(A)$ is incorrect. Rest of the statements are correct.
$\pi =MRT$ , where M is the molarity of the solution so $(B)$ is correct
vapour pressure of a component over a solution is proportional to its mole fraction, it is Rault's law so option $(C)$ is also correct.
Based on ( $m\times i$ ) value this order of osmotic pressure for 0.01 M aqueous solution is correct $BaC{l}_2>KCl>C{H}_{3}COOH>Sucrose$