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Real Gases

A gas deviate...

Question

A gas deviates from ideal behaviour at a high pressure because its molecules:

A

have kinetic energy

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B

are bound by covalent bonds

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C

attract one another

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D

show the Tyndall effect

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Solution

The correct option is D attract one another
Some attractive forces exist between the molecules of real gases at high pressure. Thus the gases deviate from ideal gas behaviour.

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Q. Real gases show deviations from ideal gas law because molecules interact with each other. At high pressures molecules of gases are very close to each other. At very low temperatures intermolecular forces become significant. The deviation from ideal gas behaviour can be measured in terms of compressibility factor

Z

, which is the ratio of product

P V

n R T

Z = P V / n R T

) . Taking the pressure and volume corrections due to intermolecular forces vander waals corrected the ideal gas equation.
In vander waals equation of state for non ideal gases, the term that accounts for intermolecular forces

State True or False.

Real gases show deviation from ideal behaviour at high temperature and low pressure.

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