Question detail
Which answer avoids confusing chromatography with another qualitative analysis result?
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 unknown ink is definitely a mixture
- B. The Rf value can be used to identify the ink only if compared with a known standard under the same conditions
- C. The Rf value is independent of the solvent used
- D. The unknown ink must be a pure substance
Answer
The correct answer is The Rf value can be used to identify the ink only if compared with a known standard under the same conditions. 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 Rf value can be used to identify the ink only if compared with a known standard under the same conditions. Use this as an exam check: if the observation is not Rf or separation evidence, the conclusion about chromatography is not properly supported. 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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