CBSE 12 Chemistry · U1
Solutions
Types of solutions, concentration expressions, solubility, vapour pressure of liquid solutions, ideal and non-ideal solutions, colligative properties, molar-mass determination, and abnormal molecular masses. Theory weightage: 7 marks.
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 1.1
Concentration and Composition of Solutions
Mass percent, molarity, molality, mole fraction, ppm and dilution.
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Topic 1.2
Solubility, Henry's Law and Raoult's Law
Gas solubility, vapour pressure of liquid solutions, ideal and non-ideal behaviour.
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Topic 1.3
Colligative Properties: Boiling and Freezing
Relative lowering of vapour pressure, elevation in boiling point, depression in freezing point and molar mass.
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Topic 1.4
Osmotic Pressure and Isotonic Solutions
Osmosis, osmotic pressure, reverse osmosis, isotonicity and molar mass from osmotic pressure.
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Topic 1.5
Abnormal Molar Mass and van't Hoff Factor
Association, dissociation, degree of ionisation and corrected colligative-property calculations.