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Question

Which of the following statements on critical constants of gases are correct?

I : Larger the TcPc value of a gas, larger would be the excluded volume.

II : Critical temperature (Tc) of a gas is greater than its Boyle's temperature (TB).

III : At the critical point in the Van der Walls gas isotherm.

⟮dPdVm⟯Tc=0


A

I and II

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B

I and III

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C

II and III

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D

I, II and III

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Solution

The correct option is D

I, II and III


While I and II are obvious from formulas for Tc and Pc and TB .

III is true by defnition . Although it is beyond the scope, please make a note of this property.


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