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. To measure temperature
- B. To separate mixtures and identify substances
- C. To create chemical reactions
- D. To change states of matter
Answer
The correct answer is To separate mixtures and identify substances. 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 separate mixtures and identify substances. 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
Misinterpreting Chromatograms
Students often think that a sample with multiple spots on a chromatogram is always impure, without considering the possibility of a mixture.
Students should remember that a mixture can produce multiple spots, while a pure substance produces a single spot. They should analyze the context of the sample to make accurate interpretations.
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