Question detail
A student is testing chromatography. Which choice keeps the observation and conclusion correctly linked?
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. Because they depend on temperature and pressure
- B. Because they are always constant
- C. Because they vary with the type of solvent used
- D. Because they are calculated differently
Answer
The correct answer is Because they depend on temperature and pressure. 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 Because they depend on temperature and pressure. The important distinction is that chromatography must be identified from spot and solvent-front distances; answers that swap in a different test or result do not match 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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