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.
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.
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Topic 1.2
Atomic Masses and Mole Concept
Atomic and molecular masses, Avogadro constant, molar mass, and conversions between mass, moles, molecules, and atoms.
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Topic 1.3
Percentage Composition and Formulae
Mass percentage, empirical formula, molecular formula, hydrates, and composition from combustion data.
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Topic 1.4
Stoichiometry and Limiting Reagent
Balanced equations, mole ratios, limiting reagent, theoretical yield, percentage yield, and gas volume at STP.
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Topic 1.5
Concentration and Integrated Mole Calculations
Molarity, molality, mass percentage, dilution, mixing solutions, and solution stoichiometry.
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