Question detail
Which answer avoids confusing chromatography 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
Purity, formulations and chromatography
Question
- A. The solvent used
- B. The paper or gel
- C. The sample being tested
- D. The temperature of the environment
Answer
The correct answer is The paper or gel. It matches chromatography because the evidence is spot and solvent-front distances and the expected result is Rf or separation evidence.
Explanation
The correct option is The paper or gel. Use this as an exam check: if the observation is not Rf or separation evidence, the conclusion about chromatography 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
Misidentifying Unknowns
Students often compare spots from unknown substances with known substances without ensuring they are on the same chromatogram.
Always ensure that both the unknown and known substances are run on the same chromatogram to make valid comparisons.
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