CBSE 11 Chemistry · U6
Equilibrium
CBSE Class 11 Chemistry Unit VI: physical and chemical equilibrium, law of mass action, equilibrium constants, Le Chatelier's principle, ionic equilibrium, pH, buffers, Henderson equation, solubility product and common-ion effect.
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 6.1
Dynamic Equilibrium and Equilibrium Constants
Physical and chemical equilibrium, dynamic nature, law of mass action, equilibrium constant, reaction quotient and Kp-Kc relation
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Topic 6.2
Le Chatelier Principle and Shifts in Equilibrium
Effect of changes in concentration, pressure, volume, temperature and catalysts on physical and chemical equilibria
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Topic 6.3
Ionic Equilibrium, Acids, Bases and pH
Strong and weak electrolytes, degree of ionisation, ionisation constants, polybasic acids, acid strength and pH calculations
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Topic 6.4
Buffers, Salt Hydrolysis and Henderson Equation
Buffer action, Henderson-Hasselbalch equation, elementary salt hydrolysis and pH resistance
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Topic 6.5
Solubility Product and Common-Ion Effect
Solubility equilibria of sparingly soluble salts, ionic product, solubility product, precipitation condition and common-ion effect
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