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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 · 2020 · Mains Paper III

Q4(c)(i). Preparation and visualisation of TLC plates

Question

Explain preparation of TLC plates and methods of locating separated spots.

Answer in brief

Apply a uniform adsorbent layer, dry/activate it, and visualise spots by a method suitable for the analytes.

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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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CoversPreparationvisualisation of TLC platesThin-layer chromatography

All parts of Question 4