Question detail
For Purity, formulations and chromatography, which option uses the correct Chemical analysis 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. fern evidence: more than one spot on the chromatogram
- B. fern distractor: an observation from a different test is used
- C. fern distractor: the answer gives a conclusion without evidence
- D. fern distractor: the response describes a measurement rather than identification
Answer
The correct answer is fern evidence: more than one spot on the chromatogram. 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 fern evidence: more than one spot on the chromatogram. This response is stronger than the distractors because it keeps the test, observation, and interpretation in the correct order for chromatography. Other options are weaker when they confuse gas tests, flame colours, ion-test precipitates, chromatography evidence, or pure-substance/formulation wording.
Common mistake
Misunderstanding Mixtures
Students often think that a mixture will produce only one spot on a chromatogram, similar to a pure substance.
Remember that a mixture can contain multiple components, leading to multiple spots on the chromatogram.
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