Chemistry · JEE

Important Questions: Mole concept, molar mass, percentage composition, empirical and molecular formulae for JEE

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The most important Mole concept, molar mass, percentage composition, empirical and molecular formulae questions for JEE cover conceptual traps, standard results, and numerical patterns from Mole concept, molar mass, percentage composition, empirical and molecular formulae. Goodmarks provides 50+ high-yield MCQs with full solutions.

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

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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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Key areas include Mole concept, molar mass, percentage composition, empirical and molecular formulae. Prioritise these before moving to edge cases.

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