Chemistry · JEE

Different methods for expressing the concentration of solution: molality, molarity, mole fraction, percentage (by volume and mass both) Concepts for JEE

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Concept explainer

Different methods for expressing the concentration of solution: molality, molarity, mole fraction, percentage (by volume and mass both) is a core JEE Main Chemistry subtopic under Solutions. Master the definitions, standard results, and typical MCQ patterns tested in JEE Main and Advanced.

Key points

Understand the definition and scope of Different methods for expressing the concentration of solution: molality, molarity, mole fraction, percentage (by volume and mass both) in the JEE syllabus
Memorise key formulas and standard results linked to Different methods for expressing the concentration of solution: molality, molarity, mole fraction, percentage (by volume and mass both)
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JEE tips

Revise Different methods for expressing the concentration of solution: molality, molarity, mole fraction, percentage (by volume and mass both) with a one-page formula sheet before attempting mixed tests
After each practice set, log mistakes specific to Different methods for expressing the concentration of solution: molality, molarity, mole fraction, percentage (by volume and mass both) and reattempt after 48 hours

Common trap

Students often rush Different methods for expressing the concentration of solution: molality, molarity, mole fraction, percentage (by volume and mass both) 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

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:

Q2ChemistryUnit 5: Solutions

The volume of ethyl alcohol (density

1.15 g / c c)

that has to be added to prepare

100 \mathrm{cc}

0.5 \mathrm{M}

ethyl alcohol solution in water is :

Q3ChemistryUnit 5: Solutions

Calculate the molality of a

1 \mathrm{M}

solution of sodium nitrate. The density of the solution is

1.25 g c m^{-3}

Q4ChemistryUnit 5: Solutions

Molarity is expressed as:

Q5ChemistryUnit 5: Solutions

Number of moles of solute in solution is represented by :

Q6ChemistryUnit 5: Solutions

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

Q7ChemistryUnit 5: Solutions

Which of the following solutions has the more capacity dissolve the solute in the solvent?

Q8ChemistryUnit 5: Solutions

The molarity of

98 \%

\mathbf{H}_{2} \mathbf{S O}_{4}(\boldsymbol{d}=\mathbf{1} . \mathbf{8} \boldsymbol{g} / \boldsymbol{m} \boldsymbol{L})

by weight is:

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Frequently asked questions

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Focus on core ideas across Different methods for expressing the concentration of solution: molality, molarity, mole fraction, percentage (by volume and mass both). JEE tests application, not just memorisation.