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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 · 2022 · Mains Paper III

Q4(b). Proximate analysis of coal

Question

Briefly describe the methods used for proximate analysis of coal.

Answer in brief

About 1 g of coal is heated in three stages and weighed after each: the two losses give moisture and volatile matter, the residue is ash; fixed carbon is found by difference.

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Topic notes: analysis of ores, alloys, petroleum, coal and coke (dolomite, bauxite, brass, Ni in steel, aniline point, proximate and ultimate analysis, calorific value), with every Civil Services, IFoS and Geo-Scientist PYQ →

Coversproximate analysiscoalmoisturevolatile matterashfixed carbon

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