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The values of van der waals constants 'a...

The values of van der waals constants 'a' and 'b' for X, Y, and Z gases are 6,6,20 and 0.025, 0.15, 0.11, respectively. Which one has the highest critical temperature ?

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The greater the magnitude of intermolecular forces of attraction of a gas, the higher the critical temperature it will have. Among the given gases, the value of a is maximum for the gas Z. thus, the magnitude of effective intermolecular forces of attraction is also maximum for Z, resulting in its higher value of critical temperature.
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CHHAYA PUBLICATION-STATES OF MATTER : GASES AND LIQUIDS-WARM UP EXERCISE
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