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The Gaseous state — Syllabus

Telangana Open School (TOSS) · Class 12 · Chemistry

What The Gaseous state covers in Telangana Open School (TOSS) Class 12 Chemistry: 4 topics, for the 2026-27 session.

52 questions30 flashcards12 formulas & key relations5 concepts

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4 Topics · Telangana Open School (TOSS) Class 12 Chemistry · 2026-27

Topics in The Gaseous state

1

States of Matter and Properties of Gases

  • Matter exists in three states: solid, liquid, and gas.
  • Gases have no fixed shape or volume and expand to fill their container.
  • Gas molecules are far apart with negligible intermolecular forces.
2

Gas Laws

  • Boyle’s Law: At constant temperature, volume is inversely proportional to pressure.
  • Charles’ Law: At constant pressure, volume is directly proportional to absolute temperature.
  • Avogadro’s Law: At constant temperature and pressure, volume is directly proportional to the number of moles.
3

Ideal Gas Equation and Dalton’s Law

  • The ideal gas equation combines Boyle’s, Charles’, and Avogadro’s laws: pV = nRT.
  • R is the universal gas constant: 0.0821 L·atm·mol⁻¹·K⁻¹.
  • Dalton’s Law: Total pressure of a gas mixture equals the sum of partial pressures.
4

Graham’s Law and Kinetic Molecular Theory

  • Graham’s Law: Rate of diffusion/effusion is inversely proportional to the square root of molar mass.
  • Kinetic Molecular Theory explains gas behavior based on molecular motion and collisions.
  • Pressure results from molecular collisions with container walls.

Key Concepts

Central concept: The Gaseous State

States of MatterGas LawsIdeal Gas EquationDalton's Law of Partial PressureGraham's Law of DiffusionKinetic Molecular TheoryMolecular SpeedsDeviation from Ideal Behavior

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Frequently Asked Questions

What are the important topics in The Gaseous state for Telangana Open School (TOSS) Class 12 Chemistry?
Key topics in The Gaseous state include States of Matter and Properties of Gases, Gas Laws, Ideal Gas Equation and Dalton’s Law, Graham’s Law and Kinetic Molecular Theory. Study these first, then practise questions on each for the Telangana Open School (TOSS) Class 12 board exam.
How should I revise The Gaseous state for the Telangana Open School (TOSS) Class 12 board exam?
Learn the core ideas first, then work through the 52 practice questions on The Gaseous state. Revise 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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All Telangana Open School (TOSS) Class 12 Chemistry Syllabus

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