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. Because substances always move at the same speed
- B. Because temperature and solvent type can affect the results
- C. Because Rf values are only calculated in specific labs
- D. Because all substances have the same Rf value
Answer
The correct answer is Because temperature and solvent type can affect the results. 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 Because temperature and solvent type can affect the results. 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 Rf Values
Students often confuse Rf values with absolute measurements, thinking they represent the actual distance a substance travels rather than a ratio.
Emphasize that Rf values are calculated as the distance moved by the substance divided by the distance moved by the solvent, and they are dimensionless ratios used for comparison.
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