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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 · 2018 · Mains Paper III

Q4(a). Chelation indicators

Question

Explain the principles of chelation titration indicators.

Answer in brief

A metallochromic indicator changes colour when EDTA removes metal from its coloured metal–indicator complex.

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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 2018 solution2018 question paper

CoversChelation indicatorsComplexometric titration

All parts of Question 4