CBSE 10 Science · U1

Chemical Substances - Nature and Behaviour

Syllabus-listed 25-mark theory unit covering chemical reactions and equations; acids, bases and salts; metals and non-metals; and carbon and its compounds. Periodic Classification of Elements is included only for formative reinforcement and should not be authored as normal year-end exam practice unless CBSE clarifies otherwise.

Test yourself

A focused, distraction-free run through 75 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

Chemical Reactions and Equations

Balanced equations, reaction types, redox reasoning and observable evidence

Topic 1.2

Acids, Bases and Salts

pH, indicators, neutralisation, common salts and everyday applications

Topic 1.3

Metals and Non-metals

Reactivity, ionic compounds, corrosion, metallurgy and lab displacement evidence

Topic 1.4

Carbon and Its Compounds

Covalent bonding, homologous series, functional groups and carbon compound reactions

Topic 1.5

Integrated Practical Chemistry

Practical observations across reactions, acids-bases, metals and carbon compounds

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