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. The sample contains sodium ions.
- B. The sample contains potassium ions.
- C. The sample contains copper ions.
- D. The sample contains calcium ions.
Answer
The correct answer is The sample contains copper ions.. It matches flame test because the evidence is flame colour and the expected result is metal ion identity.
Explanation
The correct option is The sample contains copper ions.. 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
Copper Flame Test Mistake
Students often confuse the flame color of copper ions with that of other metal ions, incorrectly identifying it as blue instead of green.
Remember that copper ions specifically produce a green flame during the flame test. Practice observing the flame colors to reinforce this identification.
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