39. Why is it easier to analyze a mixture of atomic species by absorption spectr

Question

39. Why is it easier to analyze a mixture of atomic species by absorption spectroscopy than it is to analyze a mixture of molecular species? (A) Atomic species do not have side reactions (B) Molecular species do not absorb light. (C) Molecules are larger, therefore more difficult to analyze (D) Atomic spectra have narrower lines that are easier to resolve than the features of molecular spectra. A tap water sample is to be analyzed for nickel at the ppm level. Which method would yield accurate results with the least amount of sample preparation? 40. (A) UV-visible spectrometry (B) fluorescence spectroscopy (C) ion exchange chromatography with UV detection (D) atomic absorption spectrometry

Explanation / Answer

39. It is easier to analyse atoms rather than molecules by absorption spectroscopy because the positions of the bands are well defined in atomic spectra than a molecular spectra.

So, the closest answer is D

40. For the determination of the amount of nickel in tap water the method that can be used is the UV-Vis spectroscopy owing to its simplicity, low cost, rapidity and a wide range of application. So the answer is the first option A

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