Question

Among the following, the incorrect statement is :

• A. At low pressure, real gases show ideal behaviour
• B. At very low temperature, real gases show ideal behaviour
• C. At very large volume, real gases show ideal behaviour
• D. At Boyle?s temperature, real gases show ideal behaviour

Answer 1

The Correct Option is B

To identify the incorrect statement about the behavior of real gases, let's consider each option in the context of the ideal gas theory and real gas behavior:

1. At low pressure, real gases show ideal behavior:
   • At low pressures, the intermolecular forces between gas molecules become negligible, and the gas behaves more like an ideal gas due to the increased distance between molecules.
   • This statement is true and consistent with the theory of ideal gases.
2. At very low temperature, real gases show ideal behavior:
   • At very low temperatures, the average kinetic energy between molecules decreases, and intermolecular forces become significant.
   • This causes real gases to deviate from ideal behavior as they are more likely to condense or exhibit stronger intermolecular attractions.
   • This statement is incorrect because real gases do not show ideal behavior at low temperatures.
3. At very large volume, real gases show ideal behavior:
   • At larger volumes and low pressures, gas molecules are spaced far apart, reducing intermolecular interactions.
   • This scenario mimics conditions under which ideal gases operate, where volume occupied by gas molecules is negligible.
   • The statement is correct as real gases behave more ideally at very large volumes.
4. At Boyle's temperature, real gases show ideal behavior:
   • Boyle's temperature is a specific temperature at which a real gas approximates ideal gas behavior over a range of pressures.
   • Beneath this temperature and at moderate pressures, real gases show behavior similar to ideal gases.
   • This statement is true based on the definition of Boyle’s temperature.

Thus, the incorrect statement is: At very low temperature, real gases show ideal behavior.