Chemistry · JEE

Important Questions: Solutions for JEE

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The most important Solutions questions for JEE cover conceptual traps, standard results, and numerical patterns from Different methods for expressing the concentration of solution: molality, molarity, mole fraction, percentage (by volume and mass both), The vapour pressure of solutions and Raoult's Law - Ideal and non-ideal solutions, vapour pressure composition, plots for ideal and non-ideal solutions, Colligative properties of dilute solutions: a relative lowering of vapour pressure, depression of freezing point, the elevation of boiling point and osmotic pressure, Determination of molecular mass using colligative properties, abnormal value of molar mass, van't Hoff factor and its significance. Goodmarks provides 140+ high-yield MCQs with full solutions.

Focus on what matters most. These important Solutions questions cover high-weightage concepts from Different methods for expressing the concentration of solution: molality, molarity, mole fraction, percentage (by volume and mass both), The vapour pressure of solutions and Raoult's Law - Ideal and non-ideal solutions, vapour pressure composition, plots for ideal and non-ideal solutions, Colligative properties of dilute solutions: a relative lowering of vapour pressure, depression of freezing point, the elevation of boiling point and osmotic pressure, Determination of molecular mass using colligative properties, abnormal value of molar mass, van't Hoff factor and its significance — the topics JEE repeats every year.

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Q1ChemistryUnit 5: Solutions

Pick out the correct statements This question has multiple correct options

Q2ChemistryUnit 5: Solutions

The vapour prerssure of pure liquids

A

and B are 400 and

600 m m H g

respectively at

298 K .

On mixing the two liquids, the sum of their initial volumes is equal to the volume of the final mixture. The mole fraction of liquids B is 0.5 in the mixture. The vapour pressure of the final solution,the mole fraction of components

A

and

B

in vapour phase, respectively are:

Q3ChemistryUnit 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)

Q4ChemistryUnit 5: Solutions

The incorrect statement is :

Q5ChemistryUnit 5: Solutions

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

Q6ChemistryUnit 5: Solutions

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

Q7ChemistryUnit 5: Solutions

Hydrochloric acid solution

A

and

B

have a concentration of

0.5 N

and

0.1 N

respectively. The volume of solutions

\boldsymbol{A}

and

B

required to make 2 litres of

\mathbf{0 . 2} \mathbf{N} \mathbf{H} \mathbf{C l}

are:

Q8ChemistryUnit 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:

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Frequently asked questions

What makes a Solutions question "important" for JEE?

Important questions test core concepts that appear frequently across JEE Main and Advanced papers — definitions, standard formulas, and classic problem types.

Which subtopics in Solutions are high-weightage?

Key areas include Different methods for expressing the concentration of solution: molality, molarity, mole fraction, percentage (by volume and mass both), The vapour pressure of solutions and Raoult's Law - Ideal and non-ideal solutions, vapour pressure composition, plots for ideal and non-ideal solutions, Colligative properties of dilute solutions: a relative lowering of vapour pressure, depression of freezing point, the elevation of boiling point and osmotic pressure, Determination of molecular mass using colligative properties, abnormal value of molar mass, van't Hoff factor and its significance. Prioritise these before moving to edge cases.

How many important questions should I revise?

Revise 30–50 important MCQs per unit in the last month before JEE. Focus on questions you got wrong at least once.

Can I practise only important questions on Goodmarks?

Pro users can filter by unit and subtopic to target high-yield areas. Free users can attempt sample questions on this page.