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BITSAT 2009
Exam
BITSAT
Year
2009
Subject
Chemistry
Chapter
Solutions

BITSAT 2009 · Chemistry · Solutions

Which one of the following statements is false?

Which one of the following statements is false?

Options

  1. AThe correct order of osmotic pressure for 0.01 M aqueous solution of each compound is BaCl2>KCl>CH3COOH>\mathrm{BaCl}_{2} > \mathrm{KCl} > \mathrm{CH}_{3} \mathrm{COOH} > sucrose.
  2. BThe osmotic pressure (π)(\pi) of a solution is given by the equation π=MRT\pi=\mathrm{MRT}, where M\mathrm{M} is the molarity of the solution.
  3. CRaoult's law states that the vapour pressure of a component over a solution is proportional to its mole fraction.
  4. DTwo sucrose solutions of same molality prepared in different solvents will have the same freezing point depression.

Correct answer

D. Two sucrose solutions of same molality prepared in different solvents will have the same freezing point depression.

Step-by-step solution

ΔTf=Kf×m×i\Delta \mathrm{T}_{\mathrm{f}}=\mathrm{K}_{\mathrm{f}} \times \mathrm{m} \times \mathrm{i}. Since Kf\mathrm{K}_{\mathrm{f}} has different values for different solvents, hence even if the m\mathrm{m} is the same ΔTf\Delta \mathrm{T}_{\mathrm{f}} will be different.
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