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🧪 Chemistry  ·  States of Matter  ·  NEET & JEE

According to the kinetic theory of gases, collisions between gas particles are assumed to be:

Answer: Perfectly elastic.

  • A Perfectly inelastic
  • B Perfectly elastic
  • C Partially elastic
  • D Random and energy losing

Correct answer: B. Perfectly elastic

Explanation: The kinetic theory assumes collisions between gas particles, and with container walls, are perfectly elastic, so kinetic energy is conserved.

Graph of pressure versus volume for a fixed amount of gas at constant temperature: the curve falls steeply then flattens, a hyperbola showing pressure inversely proportional to volume.

Boyle's law: at constant temperature the pressure of a fixed mass of gas is inversely proportional to its volume (P ∝ 1/V), so the P–V plot is a hyperbola — halving the volume doubles the pressure. Image: Reginaprice2013, CC BY-SA 3.0, via Wikimedia Commons.

Concept context

Discover why gases expand to fill any container while liquids flow and solids hold their shape. Master the gas laws, the ideal gas equation, and the reasons real gases deviate from ideal behavior.

Read the full States of Matter notes →