CBSE 11 Chemistry · Lab
Practicals and Projects
Official 30-mark practical component: laboratory techniques, purification and characterization, pH and equilibrium experiments, quantitative estimation, qualitative salt analysis, organic element detection, investigatory project work, practical record and viva.
Test yourself
A focused, distraction-free run through 25 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 Lab.1
Laboratory Techniques and Purification
Glass working, cork boring, melting point, boiling point and crystallisation.
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Topic Lab.2
pH and Equilibrium Experiments
pH paper, universal indicator, strong/weak acid comparison, common-ion effect and equilibrium shift.
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Topic Lab.3
Quantitative Estimation and Titration
Balance use, standard solutions, pipette-burette technique, endpoints and titration calculations.
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Topic Lab.4
Qualitative Salt Analysis
Systematic anion and cation tests, confirmatory observations and interference-aware inference.
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Topic Lab.5
Organic Element Detection and Project Work
Detection of nitrogen, sulphur and chlorine in organic compounds, and investigatory-project design.
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