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. It is a pure substance
- B. It is a mixture
- C. It is an unplanned mixture
- D. It is a formulation
Answer
The correct answer is It is a mixture. 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 It is a mixture. 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
Misinterpreting Chromatograms
Students often think that a sample with multiple spots on a chromatogram is always impure, without considering the possibility of a mixture.
Students should remember that a mixture can produce multiple spots, while a pure substance produces a single spot. They should analyze the context of the sample to make accurate interpretations.
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