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Indian Forest Service (Mains)

Chemistry optional

  • 2 papers
  • 200 marks each
  • 3 h per paper

Paper I covers physical and inorganic chemistry.

Indian Forest Service (Mains), Chemistry optional · 2021 · Paper I

Q4(a). Conductance and dilution of strong electrolytes

Question

How does Debye–Hückel theory of strong electrolytes explain the increase of molar conductance with dilution?

Answer in brief

Dilution weakens ionic-atmosphere relaxation and electrophoretic retardation, increasing ionic mobility and molar conductivity towards Λ°ₘ.

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The full model answer

As written for the answer booklet: the diagram carries the working, the lines stay short. Read here only; it is not offered as a download.

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Topic notes: electrolytic conductance, Kohlrausch's law, transport numbers and the Debye–Hückel limiting law, with every Civil Services, IFoS and Geo-Scientist PYQ →

CoversDebye–Hückel–Onsager equationmolar conductivityrelaxation effectelectrophoretic effectionic atmospherestrong electrolytes

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