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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 · 2017 · Mains Paper II

Q13(a). Debye–Huckel law and ionic strength

Question

State the Debye–Huckel limiting equation with symbols and units. Find the ionic strength of 0.01 mol L⁻¹ aqueous potassium ferrocyanide.

Answer in brief

log₁₀ γᵢ=-Azᵢ²√(Ic) and Ic=1/2Σᵢ cᵢ zᵢ². For K₄[Fe(CN)₆], Ic=0.100 mol L⁻¹.

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CoversDebye–Huckel lawionic strengthElectrolyte solutions

All parts of Question 13