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UPSC Combined Geo-Scientist

Chemist

  • 3 descriptive papers
  • 200 marks each
  • 3 h per paper

Mains Paper I covers inorganic chemistry.

UPSC Combined Geo-Scientist, Mains · 2021 · Mains Paper I

Q11(b). Peptisation and its prevention

Question

Explain the term peptisation with suitable example.

Answer in brief

Peptisation is the redispersion of a coagulated precipitate into colloidal particles, often caused by washing away the coagulating electrolyte.

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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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Topic notes: gravimetric analysis, solubility product and organic precipitants, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coverspeptisationcoagulationcolloidal precipitateelectrical double layerwashing of precipitatesilver chloride

All parts of Question 11