Chemistry · Class 11 · Chapter 6
Equilibrium
12 lessons 110 min 2 simulations 9 practice questions
This chapter studies reversible processes that settle into a dynamic balance, first in physical changes and then in chemical reactions. It develops the equilibrium constant (Kc and Kp), the reaction quotient, the link to Gibbs energy and Le Chatelier's principle, and then applies the same ideas to ions in water: acid-base theories, pH, ionisation constants, salt hydrolysis, buffers and solubility products.
What the exam asks
NEET asks for the Kp-Kc relation for a given reaction, equilibrium-constant calculations from initial amounts, the direction of shift under Le Chatelier changes, and a steady stream of pH numericals: weak acids, strong bases, buffers built by partial neutralisation, and molar solubility from Ksp. Marks go on sign errors in Δn, on using moles instead of concentrations, on forgetting that Ba(OH)₂ gives two OH⁻ per formula unit, and on the stoichiometric powers in Ksp expressions.
Lessons
12 lessons · 110 min
1Equilibrium in physical processesNCERT § "Equilibrium in Physical Processes"9 min2Law of chemical equilibrium and KcNCERT § "Law of Chemical Equilibrium and Equilibrium Constant"9 min3Homogeneous and heterogeneous equilibria; KpNCERT § "Homogeneous Equilibria"; § "Heterogeneous Equilibria"8 min4Applications of K and the reaction quotientNCERT § "Applications of Equilibrium Constants"8 min5K, Q and Gibbs energyNCERT § "Relationship between Equilibrium Constant K, Reaction Quotient Q and Gibbs Energy G"7 min6Factors affecting equilibria: Le Chatelier's principleNCERT § "Factors Affecting Equilibria"11 min 1 sim7Ionic equilibrium and acid-base conceptsNCERT § "Ionic Equilibrium in Solution"; § "Acids, Bases and Salts"9 min8Ionisation of water, pH, weak acids and weak basesNCERT § "Ionization of Acids and Bases"11 min 1 sim9Common ion effect and hydrolysis of saltsNCERT § "Common Ion Effect in the Ionization of Acids and Bases"; § "Hydrolysis of Salts and the pH of their Solutions"7 min10Buffer solutionsNCERT § "Buffer Solutions"7 min11Solubility equilibria of sparingly soluble saltsNCERT § "Solubility Equilibria of Sparingly Soluble Salts"7 min12Chapter reviewMust-know facts, traps and formulas17 min