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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 · 2022 · Mains Paper II

Q2(a). Reduced equation of state from the van der Waals equation

Question

Derive the reduced equation of state from van der Waals equation.

Answer in brief

(Pr + 3/Vr²)(3Vr − 1) = 8Tr; the constants a and b cancel, so one equation fits every van der Waals gas.

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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 →

Coversreduced equation of statevan der Waals equationcritical constantslaw of corresponding statesreduced variables

All parts of Question 2