CBSE 11 Chemistry · U1

Some Basic Concepts of Chemistry

CBSE Class 11 Chemistry Unit I: measurement, significant figures, laws of chemical combination, mole concept, percentage composition, empirical and molecular formulae, stoichiometry, limiting reagent, yield, and concentration terms.

Test yourself

A focused, distraction-free run through 50 multiple-choice questions. Hints if you need them; your score at the end.

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Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Topic 1.1

Matter, Measurement and Laws

States and classification of matter, measurement, uncertainty, significant figures, and laws of chemical combination.

Topic 1.2

Atomic Masses and Mole Concept

Atomic and molecular masses, Avogadro constant, molar mass, and conversions between mass, moles, molecules, and atoms.

Topic 1.3

Percentage Composition and Formulae

Mass percentage, empirical formula, molecular formula, hydrates, and composition from combustion data.

Topic 1.4

Stoichiometry and Limiting Reagent

Balanced equations, mole ratios, limiting reagent, theoretical yield, percentage yield, and gas volume at STP.

Topic 1.5

Concentration and Integrated Mole Calculations

Molarity, molality, mass percentage, dilution, mixing solutions, and solution stoichiometry.

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