Chemistry · JEE

Colligative properties of dilute solutions: a relative lowering of vapour pressure, depression of freezing point, the elevation of boiling point and osmotic pressure Concepts for JEE

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Colligative properties of dilute solutions: a relative lowering of vapour pressure, depression of freezing point, the elevation of boiling point and osmotic pressure is a core JEE Main Chemistry subtopic under Solutions. Master the definitions, standard results, and typical MCQ patterns tested in JEE Main and Advanced.

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Students often rush Colligative properties of dilute solutions: a relative lowering of vapour pressure, depression of freezing point, the elevation of boiling point and osmotic pressure questions without checking units, sign conventions, or boundary conditions — always verify assumptions before calculating.

Syllabus context

Part of Solutions in JEE Main Chemistry.

Free sample questions

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Q1ChemistryUnit 5: Solutions

The observed osmotic pressure for a

0.10 M

solution of

F e\left(N H_{4}\right)_{2}\left(S O_{4}\right)_{2}

25^{\circ} C

is 10.8 atm. The expected and experimental (observed) values of Van't Hoff factor (i) will be respectively:

\left(\boldsymbol{R}=\mathbf{0 . 0 8 2} \quad \boldsymbol{L} \quad \boldsymbol{a t m} \quad \boldsymbol{k}^{-} \boldsymbol{m o l}^{-1}\right)

Q2ChemistryUnit 5: Solutions

Which type of phenomenon is used when coloured dye is removed from solution of sugar by charcoal?

Q3ChemistryUnit 5: Solutions

At constant temperature, the osmotic pressure of a solution is: This question has multiple correct options

Q4ChemistryUnit 5: Solutions

18 g glucose

\left(C_{6} H_{12} O_{6}\right)

is added to

178.2 \mathrm{g}

of water. The vapour pressure of this aqueous solution at

100^{0} C

in torr is:

Q5ChemistryUnit 5: Solutions

The vapour pressure of an aqueous solution is found to be 750 torrs at certain temperature 'T'. If 'T' is the temperature at which pure water boils under atmospheric pressure and same solution show elevation in the boiling point

\Delta T_{b}=1.04 K,

find the atmospheric pressure?

\left[\boldsymbol{K}_{\boldsymbol{b}}=\mathbf{0 . 5 2} \boldsymbol{K} \boldsymbol{k g m o l}-\mathbf{1}\right]

Q6ChemistryUnit 5: Solutions

The Brownian movement is due to:

Q7ChemistryUnit 5: Solutions

A colloidal system having a solid substance as a dispersed phase and a liquid as a dispersion medium are classified as:

Q8ChemistryUnit 5: Solutions

A mixture of chlorobenzene and wate (immiscible) boils at

90.3^{\circ} \mathrm{C}

at an external pressure of

740.2 \mathrm{mm} .

The vapour pressure of pure water at

90.3^{\circ} \mathrm{C}

530.1 \mathrm{mm}

. Calculate the

\%

composition of distillate:

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