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NTA Abhyas JEE Main2020ChemistryStates of MatterPractice

At low pressure, the van der Waals' equation is reduced to

Options

  1. AZ   =   PV m RT   =   1 − aP RT
  2. BZ   =   PV m RT   =   1   +   bP RT
  3. CPV m   =   RT
  4. DZ   =   PV m RT   =   1 − a V m RT

Correct answer

D. Z   =   PV m RT   =   1 − a V m RT

Step-by-step solution

Van der Waals' equation (at low pressure), P + a V 2 V − b = RT at low pressure V m will be high ∴   b can be neglected P + a V m 2 V m = RT PV m = RT − a V m ∴ Z = PV m RT = 1 − a V m RT

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