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UPSC Combined Geo-Scientist

Chemist

  • 2 objective papers
  • 120 questions each
  • 2 h per paper
  • 100 + 300 marks

Prelims Paper II covers chemistry.

UPSC Combined Geo-Scientist, Prelims · 2020 · Paper II, Chemistry · Q42 of 120

Geo-Scientist Prelims 2020 Chemistry Q42: The ratio of Boyle’s temperature (TB) and critical temperature (TC)…

QuestionReal gases / van der Waals

The ratio of Boyle’s temperature (TB) and critical temperature (TC) of a gas obeying van der Waals equation is given by:

  1. (a) TB : TC = 27: 8
  2. (b) TB : TC = 4: 27
  3. (c) TB : TC = 3: 2
  4. (d) TB : TC = 8: 27

Answer: (a) TB : TC = 27: 8

TB = a/(Rb); TC = 8a/(27Rb). TB/TC = 27/8 → 27 : 8 → (a). Remember: Ti (inversion) = 2a/(Rb) = 2TB.

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