Which of the following is true at the critical point?A. At the critical point three roots of van der Waals equation are equalB. Below the critical point two roots of the van der Waals equation are equal and imaginary but one root is realC. Above the critical point density of gas is greater than density of liquidD. Above the critical point three roots of van der Waals equation are real but unequal.

Which of the following is true at the critical point?A. At the critica

1.	Which of the following is true at the critical point?A. At the critical point three roots of van der Waals equation are equalB. Below the critical point two roots of the van der Waals equation are equal and imaginary but one root is realC. Above the critical point density of gas is greater than density of liquidD. Above the critical point three roots of van der Waals equation are real but unequal.
Answer» Correct Answer - A At the critical point three roots of the van der Waals equation are equal.

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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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Match the following gas laws with the equation representing them.
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