A real gas obeying Vander Waal equation has $a = 6.72 a t m - l i t^{2} m o l^{- 2}$ and $b = 0.273 l i t m o l^{- 1}$ . At what temperature substances will exist only in gaseous state irrespective of pressure.

400 K

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200 K

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90 K

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150 K

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Solution

The correct option is A $400 K$
$Given, a=6.72 ; b=0.273 T_{C} = Critical Temperature = \frac{8 a}{27 R b} = 88.83 K At critical Yemperature substance exist only in gaseous state irrespective of pressure.$

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