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. It holds the substances in place.
- B. It carries the substances through the stationary phase.
- C. It separates the substances based on their mass.
- D. It reacts with the substances to form new compounds.
Answer
The correct answer is It carries the substances through the stationary phase.. 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 It carries the substances through the stationary phase.. 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
Understanding Separation in Chromatography
Students often confuse the roles of the mobile phase and stationary phase in chromatography, thinking that both phases contribute equally to separation.
Clarify that the separation of substances depends on how they distribute between the mobile phase (which moves) and the stationary phase (which stays still).
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