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STD 12 -1. Solution and colligative properties — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 -1. Solution and colligative properties4 Marks
MCQ
Which one of the following statement is false?
  • A
    Raoult's law for mixture of two liquids, states that the vapour pressure of a component over a solution is proportional to its mole fraction
  • B
    The osmotic pressure $(\pi)$ of a solution is given by a equation $\pi = iMRT$ where $M$ is the molarity of the solution
  • C
    The correct order of osmotic pressure for $0.01\, M$ aqueous solution of each compound is $BaCl_2 > KCl > CH_3COOH > Sucrose$
  • ✓
    Two sucrose solutions of same molality prepared in different solvent will have the same freezing point depression
✓

Answer

Correct option: D.
Two sucrose solutions of same molality prepared in different solvent will have the same freezing point depression
d
The statement $D$ is false.

Two sucrose solutions of the same molality prepared in different solvents will have different freezing point depression. This is because the molal depression in freezing point constant $K_{ b }$ is different for different solvents.

The freezing point depression $=\Delta T _{ f }= K _{ b } \times m$

Here, $m$ is the molality of sucrose solution.

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