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Alkali metals can be determined by flame photometry or by spectroscopy that is:

AMass spectrometry
BAtomic absorption
CNuclear magnetic
DInfrared based
Answer & Solution
Correct answer: B. Atomic absorption
1. Two analytical techniques are named together. 2. One is flame photometry. 3. The other is atomic absorption spectroscopy. _Source: syllabus Chemistry Part II, Unit 10, The s-Block Elements._
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