alleryStart learning →In a flame test, sodium and its compounds impart which characteristic colour to the flame?
ACrimson red
BBright yellow
CPale violet
DGreen
Answer & Solution
Correct answer: B. Bright yellow
1. Flame colours arise from the emission spectrum of the metal ion present, and each element has its own signature colour.
2. The text states: "Sodium and its compounds impart a bright yellow color to a flame."
3. Lithium instead produces crimson, most other alkali metals produce pale violet, and barium (an alkaline earth metal) produces green -- these are different elements' signatures.
4. So sodium's flame test colour is specifically bright yellow.
_Source: OpenStax Chemistry Ch 18 "Representative Metals, Metalloids, and Nonmetals", p.968 §18.1 Periodicity_
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