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Chemical Equilibrium

Maharashtra Board · Class 11 · Chemistry

Quick revision notes for Chemical Equilibrium — Maharashtra Board Class 11 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

45 questions25 flashcards5 concepts

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Key Topics to Revise

1

Types of Chemical Reactions and Reversible Reactions

  • Irreversible reactions proceed in one direction until reactants are exhausted (C + O₂ → CO₂)
  • Reversible reactions occur in both forward and backward directions simultaneously (H₂ + I₂ ⇌ 2HI)
  • Double arrow (⇌) indicates reversibility, single arrow (→) indicates irreversibility
2

Equilibrium in Physical Processes

  • Liquid-vapour equilibrium: H₂O(l) ⇌ H₂O(g) in closed container
  • Evaporation rate = condensation rate at equilibrium
  • Solid-liquid equilibrium: ice and water at 273K in insulated system
3

Chemical Equilibrium and Law of Mass Action

  • Chemical equilibrium occurs when rate of forward reaction = rate of reverse reaction
  • Concentrations of all species remain constant at equilibrium
  • Law of Mass Action: rate ∝ product of concentration terms raised to their stoichiometric coefficients
4

Homogeneous and Heterogeneous Equilibria

  • Homogeneous equilibrium: all species in same phase (2HI(g) ⇌ H₂(g) + I₂(g))
  • Heterogeneous equilibrium: species in different phases (CaCO₃(s) ⇌ CaO(s) + CO₂(g))
  • For heterogeneous equilibria, concentrations of pure solids and liquids are constant

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Full Notes

Key Concepts

Irreversible reactions proceed in one directionAt equilibriumFor reaction aA + bB ⇌Homogeneous equilibrium involves all speciesReaction quotient Q has same form

Frequently Asked Questions

What are the important topics in Chemical Equilibrium for Maharashtra Board Class 11 Chemistry?
Chemical Equilibrium covers several key topics that are frequently asked in Maharashtra Board Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Chemical Equilibrium — Maharashtra Board Class 11 Chemistry?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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