Question:

For a gas, deviation from ideal behaviour is maximum at:

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Real gases deviate from ideal behavior under conditions of high pressure and low temperature due to the increased significance of intermolecular forces and the non-negligible volume of gas molecules.
Updated On: Mar 15, 2025
  • \(0^{\circ}C\) & 1.0 atm
  • \(-25^{\circ}C\) & 5.0 atm
  • \(-25^{\circ}C\) & 2.0 atm
  • \(100^{\circ}C\) & 1.0 atm
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The Correct Option is B

Solution and Explanation

Deviation from ideal behavior is maximum when the intermolecular forces become significant. This happens at:

  • Low Temperatures: At low temperatures, the kinetic energy of the gas molecules is low, and the intermolecular forces become more dominant.
  • High Pressures: At high pressures, the molecules are forced closer together, increasing the effect of intermolecular forces and reducing the free volume available for the molecules.

Comparing the options:

  • (1) \(0^{\circ}C\) & 1.0 atm: Relatively moderate conditions.
  • (2) \(-25^{\circ}C\) & 5.0 atm: Low temperature and high pressure, favoring maximum deviation.
  • (3) \(-25^{\circ}C\) & 2.0 atm: Low temperature but lower pressure than option (2).
  • (4) \(100^{\circ}C\) & 1.0 atm: High temperature and low pressure, favoring ideal behavior.

Therefore, the maximum deviation from ideal behavior occurs at \(-25^{\circ}C\) and 5.0 atm.

Final Answer:
\(-25^{\circ}C\) & 5.0 atm.

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