A Levels Chemistry (9701)•9701/11/M/J/19

Explanation
Ideal Gas Behavior at High T and Low P
Steps:
- Recall ideal gas law assumes negligible molecular volume and no intermolecular forces.
- Consider real gas deviations: at low T, attractions dominate; at high P, molecular volume matters.
- Evaluate conditions: high T minimizes attractions; low P minimizes volume effects.
- Match to options: B combines both favorable conditions.
Why B is correct:
- High temperature provides kinetic energy to overcome intermolecular forces, while low pressure ensures molecular volume is negligible compared to container volume, aligning with ideal gas assumptions (PV = nRT).
Why the others are wrong:
- A: High pressure causes molecular crowding, amplifying volume deviations.
- C: Low temperature enhances intermolecular attractions, causing non-ideal clustering.
- D: High pressure overrides temperature benefits by increasing molecular interactions.
Final answer: B
Topic: States of matter
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