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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 · 2016 · Mains Paper III

Q2(a). Iodometric bleach assay

Question

25.00 mL bleach is diluted to 1000 mL. A 25 mL aliquot, treated with excess KI, requires 8.96 mL of 0.09892 M thiosulfate. Calculate % w/v NaOCl.

Answer in brief

The original bleach contains 5.278% w/v NaOCl.

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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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CoversIodometric bleach assayRedox titrimetry

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