Chemistry · JEE

Important Questions: Solutions for JEE

11+ syllabus-aligned questions available

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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 11+ 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.

Subtopics in Solutions

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

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Q1ChemistryUnit 5: Solutions

The incorrect statement is :

Q2ChemistryUnit 5: Solutions

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

Q3ChemistryUnit 5: Solutions

The solubility of a substance is defined as the amount of solute in grams:

Q4ChemistryUnit 5: Solutions

The vapour pressure is least for?

Q5ChemistryUnit 5: Solutions

The mass of non-volatile, non-elctrolyte solute (molar mass

50 g

mol

^{-1}

) needed to be dissolved in

114 g

octane to reduce its vapour pressure to

75 \%

, is

Q6ChemistryUnit 5: Solutions

Which of the following will show a negative deviation from Raoult's law?

Q7ChemistryUnit 5: Solutions

Which of the following solutions shows positive deviation from Raoult's law?

Q8ChemistryUnit 5: Solutions

Solutions

A, B, C

and

D

are respectively

0.1 M

glucose,

\mathbf{0 . 0 5} M N a C l, 0.05 M B a C l_{2}

and

0.1 M A l C l_{3} .

Which one of the following pairs is isotonic?

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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.