Question detail
Which statement would earn credit for Compare spots from unknown substances with known substances on the same chromatogram.?
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. Multiple spots
- B. No spots
- C. A single spot
- D. A blurred line
Answer
The correct answer is A single spot. 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 A single spot. 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
Misidentifying Unknowns
Students often compare spots from unknown substances with known substances without ensuring they are on the same chromatogram.
Always ensure that both the unknown and known substances are run on the same chromatogram to make valid comparisons.
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