61.
Comparing infrared with Raman spectroscopy for an aqueous sample, Raman is preferred because water
Answer: A
Correct answer: scatters feebly while absorbing infrared strongly
Water is the worst possible solvent for infrared work, its O-H stretch and bend absorbing so strongly that they swamp the spectrum and leave only narrow windows. In Raman the same vibrations produce little change in polarisability, so water scatters weakly and the solute’s own bands stand out against it. Aqueous samples can therefore be run directly, in glass, without drying or solvent exchange.
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