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. To ensure the solvent is the same
- B. To maintain consistent temperature
- C. To avoid contamination
- D. To ensure accurate comparisons
Answer
The correct answer is To ensure accurate comparisons. 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 To ensure accurate comparisons. 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
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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