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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 · Q66 of 120

Geo-Scientist Prelims 2020 Chemistry Q66: Which among the following is the correct order for osmotic pressure…

QuestionSolutions / osmotic pressure

Which among the following is the correct order for osmotic pressure of equimolar solutions of glucose, sodium chloride and barium chloride?

  1. (a) C₆H₁₂O₆ > BaCl₂ > NaCl
  2. (b) C₆H₁₂O₆ > NaCl > BaCl₂
  3. (c) BaCl₂ > NaCl > C₆H₁₂O₆
  4. (d) NaCl > C₆H₁₂O₆ > BaCl₂

Answer: (c) BaCl₂ > NaCl > C₆H₁₂O₆

π = iCRT; equimolar so π ∝ i. BaCl₂ i = 3; NaCl i = 2; glucose i = 1 → BaCl₂ > NaCl > C₆H₁₂O₆ → (c).

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