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UPSC Combined Geo-Scientist

Chemist

  • 3 descriptive papers
  • 200 marks each
  • 3 h per paper

Mains Paper II covers physical chemistry.

UPSC Combined Geo-Scientist, Mains · 2021 · Mains Paper II

Q2. Virial equation; B from the van der Waals equation

Question

What is the virial equation of state? Derive the expression for the second virial coefficient from Van der Waals equation.

Answer in brief

Z = 1 + B/Vm + C/Vm² + …; van der Waals: B = b − a/RT, C = b²; B = 0 at TB = a/Rb.

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Topic notes: real gases, the van der Waals equation, critical constants and Boyle temperature, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coversvirial equation of statesecond virial coefficientvan der Waals equationBoyle temperatureKamerlingh Onnes