Chemistry · JEE

Mole concept, molar mass, percentage composition, empirical and molecular formulae Concepts for JEE

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Quick answer

Master Mole concept, molar mass, percentage composition, empirical and molecular formulae by understanding definitions, standard results, and typical JEE question patterns — then practise with syllabus-aligned MCQs on Goodmarks.

Build clear conceptual foundations for Mole concept, molar mass, percentage composition, empirical and molecular formulae before speed practice. This guide covers what JEE expects and how to test yourself with MCQs.

Concept explainer

Mole concept, molar mass, percentage composition, empirical and molecular formulae is a core JEE Main Chemistry subtopic under Some Basic Concepts in Chemistry. Master the definitions, standard results, and typical MCQ patterns tested in JEE Main and Advanced.

Key points

Understand the definition and scope of Mole concept, molar mass, percentage composition, empirical and molecular formulae in the JEE syllabus
Memorise key formulas and standard results linked to Mole concept, molar mass, percentage composition, empirical and molecular formulae
Practise 20–40 syllabus-aligned MCQs with step-by-step solutions

JEE tips

Revise Mole concept, molar mass, percentage composition, empirical and molecular formulae with a one-page formula sheet before attempting mixed tests
After each practice set, log mistakes specific to Mole concept, molar mass, percentage composition, empirical and molecular formulae and reattempt after 48 hours

Common trap

Students often rush Mole concept, molar mass, percentage composition, empirical and molecular formulae questions without checking units, sign conventions, or boundary conditions — always verify assumptions before calculating.

Syllabus context

Part of Some Basic Concepts in Chemistry in JEE Main Chemistry.

Free sample questions

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Q1ChemistryUnit 1: Some Basic Concepts in Chemistry

What is molecular formula of oleum?

Q2ChemistryUnit 1: Some Basic Concepts in Chemistry

The volume of 0.5 moles of a gas at 273

\mathrm{K}

and

380 \mathrm{mm}

pressure is:

Q3ChemistryUnit 1: Some Basic Concepts in Chemistry

The number of significant figures in

N_{0}=6.022 \times 10^{23}

i.e., Avogadro's number, is :

Q4ChemistryUnit 1: Some Basic Concepts in Chemistry

380 \mathrm{mL}

of a gas at

27^{0} \mathrm{C}, 800 \mathrm{mm}

\mathrm{Hg}

weight

0.455 \mathrm{g} .

the mol.wt.of gas is:

Q5ChemistryUnit 1: Some Basic Concepts in Chemistry

Which of the following contains maximum number of atoms?

Q6ChemistryUnit 1: Some Basic Concepts in Chemistry

A metal M of atomic weight 54.94 g has a density of 7.42 g/cc. The apparent volume occupied by one atom of the metal will be:

Q7ChemistryUnit 1: Some Basic Concepts in Chemistry

If repeated measurements give values close to one another, the number is:

Q8ChemistryUnit 1: Some Basic Concepts in Chemistry

The number of moles of sodium oxide in 620 g of it is:

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Frequently asked questions

What concepts in Mole concept, molar mass, percentage composition, empirical and molecular formulae are essential for JEE?

Focus on core ideas across Mole concept, molar mass, percentage composition, empirical and molecular formulae. JEE tests application, not just memorisation.