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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 · 2025 · Mains Paper III

Q4(c). Ultimate analysis of coal: significance; estimation of ash

Question

Write the significance of ultimate analysis of coal. Describe the method for estimation of ash content in coal sample.

Answer in brief

Ultimate analysis gives % C, H, N, S and O (by difference): it fixes calorific value, rank, combustion air and pollution load. Ash is the residue after burning about 1 g at 700–750 °C.

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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 →

Coversultimate analysis of coalash contentDulong formulacalorific valueproximate analysismuffle furnace

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