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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 · 2021 · Paper II, Chemistry · Q68 of 120

Geo-Scientist Prelims 2021 Chemistry Q68: P is the total vapor pressure of an ideal binary liquid solution.…

QuestionSolutions / Raoult's law and vapour composition

P is the total vapor pressure of an ideal binary liquid solution. If y_A and y_B are the amount fractions of the constituents in vapor phase, then which one of the following statements is correct?

  1. (a) P varies linearly with y_A and y_B
  2. (b) 1/P varies linearly with y_A and y_B
  3. (c) P varies linearly with y_A and y_B and passes through origin
  4. (d) 1/P varies linearly with y_A and y_B and passes through origin

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Topic notes: solutions: Raoult’s and Henry’s laws, non-ideal solutions, colligative properties, the van ’t Hoff factor and activity, with every Civil Services, IFoS and Geo-Scientist PYQ →

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