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🧪 Chemistry  ·  States of Matter  ·  NEET & JEE

At STP (273 K, 1 atm), the molar volume of an ideal gas is:

Answer: 22.4 L.

  • A 22.4 L
  • B 24.4 L
  • C 11.2 L
  • D 2.24 L

Correct answer: A. 22.4 L

Explanation: One mole of an ideal gas occupies 22.4 litres at standard temperature and pressure.

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.

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