Question detail
In Chromatography, which answer best matches the evidence for chromatography?
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 carries the substances through the stationary phase
- B. It solidifies the substances
- C. It reacts with the substances
- D. It measures the Rf value
Answer
The correct answer is It carries the substances through the stationary phase. 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 carries the substances through the stationary phase. This is correct because spot and solvent-front distances is the evidence expected for chromatography, and Rf or separation evidence is the result that supports the conclusion. 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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