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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(c)(i). Absorbance of iron thiocyanate

Question

Find absorbance of 3.49×10⁻⁵ M Fe(SCN)²⁺ at 580 nm with ε=7.00×10³ L mol⁻¹ cm⁻¹.

Answer in brief

A=0.2443 for an assumed 1.00 cm cell; generally A=0.2443 b/(1 cm).

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CoversAbsorbance of iron thiocyanateBeer–Lambert law

All parts of Question 4