Question detail
Which statement would earn credit for Calculate Rf values using distance moved by substance divided by distance moved by…?
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. 0.5
- B. 2.0
- C. 1.0
- D. 0.25
Answer
The correct answer is 0.5. 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 0.5. The answer stays inside Purity, formulations and chromatography by linking the observation to the conclusion instead of naming a substance without evidence. 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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