Assertion : All the gases should be cooled below their critical temperature for liquification . Reason : Cooling slows down the movement of molecules therefore , intermolecular forces may hold the slowly moving molecules together and the gas liquifies .A. If both assertion and reason are true and reason is the correct explanation of assertion .B. If both assertion and reason are true but reason is not the correct explanation of assertion .C. If assertion is true but reason is false .D. If both assertion and reason are false .

Assertion : All the gases should be cooled below their critical temper

1.	Assertion : All the gases should be cooled below their critical temperature for liquification . Reason : Cooling slows down the movement of molecules therefore , intermolecular forces may hold the slowly moving molecules together and the gas liquifies .A. If both assertion and reason are true and reason is the correct explanation of assertion .B. If both assertion and reason are true but reason is not the correct explanation of assertion .C. If assertion is true but reason is false .D. If both assertion and reason are false .
Answer» Correct Answer - B Critical temperature of a gas is the highest temperature at which liquification of the gas first occurs. Above critical temperature, gas cannot be liquefied howsoever high pressure may be applied on the gas.

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The gases obey the different gas laws only theoretically. Practically all of them show some deviation from these laws. These are called real gases. The deviation are maximum under high pressyre and at low temperature. These are comparatively small when the conditions are reversed. It has been found that the easily liquefiable gases show more deviations from the ideal gas beheviour as compared to the gases which are liqufied with diffculty. Gas deviates from ideal gas beheviour because moleculesA. are coloulessB. attract each otherC. contain covalent bondD. show Brownian Movement.
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