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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(b). Plate height

Question

A gas-chromatographic column is 3 ft long. On the chromatogram tR=52.3 mm and baseline width WB=9.0 mm. Find HETP in cm.

Answer in brief

N≈540 plates and H=0.1692 cm per plate.

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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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CoversPlate heightChromatographic efficiency

All parts of Question 4