Question detail
Which answer avoids confusing flame test with another qualitative analysis result?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Identification of ions by chemical and spectroscopic means
Question
- A. grove evidence: flame colour identifies the metal ion
- B. grove distractor: an observation from a different test is used
- C. grove distractor: the answer gives a conclusion without evidence
- D. grove distractor: the response describes a measurement rather than identification
Answer
The correct answer is grove evidence: flame colour identifies the metal ion. It matches flame test because the evidence is flame colour and the expected result is metal ion identity.
Explanation
The correct option is grove evidence: flame colour identifies the metal ion. Use this as an exam check: if the observation is not metal ion identity, the conclusion about flame test is not properly supported. Other options are weaker when they confuse gas tests, flame colours, ion-test precipitates, chromatography evidence, or pure-substance/formulation wording.
Common mistake
Common Mistake in Flame Tests
Students often confuse the flame color of potassium ions with that of sodium ions, thinking both produce a yellow flame.
Remember that potassium ions produce a lilac flame, while sodium ions produce a yellow flame. Use mnemonic devices or color charts to help differentiate between them.
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