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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

Q6(a). Negative absorbance

Question

Give possible causes and remedies for negative UV–visible absorbance.

Answer in brief

Negative absorbance means the measured sample intensity exceeds the reference intensity; it usually indicates a reference or baseline mismatch.

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CoversNegative absorbanceInstrumental analysis

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