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. The substance reacts with the paper to form a new compound
- B. The substance is completely insoluble in the solvent
- C. The substance has a single distribution ratio between the stationary and mobile phases
- D. The substance evaporates before it can move
Answer
The correct answer is The substance has a single distribution ratio between the stationary and mobile phases. 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 The substance has a single distribution ratio between the stationary and mobile phases. 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 Chromatography
Students often think that chromatography can only separate solid mixtures and do not realize it can separate soluble substances like inks.
Emphasize that chromatography is specifically designed to separate soluble substances, such as colored inks or food colorings, highlighting its versatility.
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