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 distance moved by the solvent
- B. The distance moved by the substance divided by the distance moved by the solvent
- C. The total distance of the chromatogram
- D. The concentration of the substance
Answer
The correct answer is The distance moved by the substance divided by the distance moved by the solvent. 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 distance moved by the substance divided by the distance moved by the solvent. 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
Misunderstanding Chromatography
Students often think that chromatography separates substances based on their color alone.
Emphasize that chromatography separates substances based on their solubility and interaction with the stationary and mobile phases, not just their color.
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