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.
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
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Topic 1.2
Acids, Bases and Salts
pH, indicators, neutralisation, common salts and everyday applications
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Topic 1.3
Metals and Non-metals
Reactivity, ionic compounds, corrosion, metallurgy and lab displacement evidence
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Topic 1.4
Carbon and Its Compounds
Covalent bonding, homologous series, functional groups and carbon compound reactions
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Topic 1.5
Integrated Practical Chemistry
Practical observations across reactions, acids-bases, metals and carbon compounds
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