Question detail
For Purity, formulations and chromatography, which option uses the correct Chemical analysis 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. Distance moved by the spot divided by distance moved by the solvent front
- B. Distance moved by the solvent front divided by distance moved by the spot
- C. Distance moved by the baseline divided by the paper length
- D. Distance moved by the mixture divided by the pencil line
Answer
The correct answer is Distance moved by the spot divided by distance moved by the solvent front. 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 Distance moved by the spot divided by distance moved by the solvent front. This response is stronger than the distractors because it keeps the test, observation, and interpretation in the correct order for chromatography. 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 Value Calculation
Students often confuse the distances moved by the substance and the solvent when calculating Rf values.
Ensure to measure the distance moved by the substance and the distance moved by the solvent separately, then use the formula Rf = distance moved by substance / distance moved by solvent.
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