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UPSC Combined Geo-Scientist

Chemist

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

Mains Paper III covers analytical and organic chemistry.

UPSC Combined Geo-Scientist, Mains · 2020 · Mains Paper III

Q2(c). Stoichiometry of the iron–phenanthroline complex

Question

Explain slope-ratio and mole-ratio methods for determining Fe(II):1,10-phenanthroline stoichiometry.

Answer in brief

Both methods establish Fe:phen = 1:3 for [Fe(phen)₃]²⁺.

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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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Read the whole 2020 solution2020 question paper

CoversStoichiometry of the iron–phenanthroline complexSpectrophotometric methods

All parts of Question 2