Question:medium

Which of the following gases will deviate most from ideal behavior at high pressure?

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At high pressures, gases with stronger intermolecular forces and larger molecular sizes show more deviation from ideal behavior. Polar or easily polarizable gases like \( \text{CO}_2 \) deviate more than light, monoatomic gases like He or Ne.
Updated On: Mar 27, 2026
  • Hydrogen
  • Helium
  • Carbon dioxide
  • Neon
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The Correct Option is C

Solution and Explanation

Phase 1: Ideal Behavior Deviation Factors.
Deviations in gas behavior from the ideal model stem from intermolecular attractions and the physical volume of gas particles. These discrepancies escalate at elevated pressures.
Phase 2: Intermolecular Force Assessment.
Hydrogen and Helium, being lightweight, possess negligible intermolecular forces.
Neon, a noble gas, exhibits weak van der Waals forces.
Carbon dioxide, a larger and more polarizable molecule, experiences stronger intermolecular attractions, resulting in more pronounced deviations.
Phase 3: Determination.
Under high pressure conditions, Carbon dioxide demonstrates the greatest deviation from ideal gas behavior, attributed to its substantial van der Waals forces and molecular dimensions.
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