Question detail
What is the Rf value in chromatography?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Chromatography (A-level only)
Question
- A. The ratio of the distance traveled by the compound to the distance traveled by the solvent front.
- B. The distance traveled by the stationary phase.
- C. The time taken for the compound to elute.
- D. The concentration of the compound in the mobile phase.
Answer
The ratio of the distance traveled by the compound to the distance traveled by the solvent front.
Explanation
The correct option is The ratio of the distance traveled by the compound to the distance traveled by the solvent front.. The ratio of the distance traveled by the compound to the distance traveled by the solvent front. is the best answer because it directly supports the AQA A-Level Chemistry objective to explain separation using stationary and mobile phases. This reasoning is anchored to Chromatography (A-level only) in Chromatography (A-level only), and it separates mobile phase from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.
Common mistake
Confusing Phases
Students often confuse the roles of stationary and mobile phases in chromatography, thinking both are the same.
Remember that the stationary phase is the substance that does not move, while the mobile phase is the solvent that carries the mixture through the stationary phase.
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