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. It raises the boiling point
- B. It lowers the boiling point
- C. It does not affect the boiling point
- D. It makes the boiling point unpredictable
Answer
The correct answer is It lowers the boiling point. 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 It lowers the boiling point. 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
Misunderstanding Pure Substances
Students often think that a pure substance can produce multiple spots on a chromatogram.
Remember that a pure substance will always produce a single spot on a chromatogram, indicating it is not mixed with any other substances.
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