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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 · 2016 · Mains Paper III

Q5(b). Oxidising fusion test

Question

An ore is fused with Na₂CO₃–Na₂O₂. Its water leach is brown-violet or green; cold dilute H₂SO₄ either removes the colour or makes it violet. Distinguish hematite and pyrolusite.

Answer in brief

Brown-violet ferrate that loses colour on acidification indicates iron; green manganate becoming violet indicates manganese.

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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 2016 solution2016 question paper

CoversOxidising fusion testQualitative inorganic analysis

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