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. To move the solvent
- B. To provide a surface for separation
- C. To dissolve the substances
- D. To measure the distance moved
Answer
The correct answer is To provide a surface for separation. 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 To provide a surface for separation. 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
Understanding Rf Values
Students often think Rf values can be compared across different experiments without considering the conditions.
Emphasize that Rf values are only meaningful when the chromatography is performed under the same conditions, such as temperature and solvent.
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