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. The distance moved by the solvent
- B. The ratio of the distance moved by the substance to the distance moved by the solvent
- C. The total distance traveled by the substance
- D. The concentration of the substance
Answer
The correct answer is The ratio of the distance moved by the substance to the distance moved by the solvent. 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 ratio of the distance moved by the substance to the distance moved by the solvent. 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
Misidentifying Unknowns
Students often compare spots from unknown substances with known substances without ensuring they are on the same chromatogram.
Always ensure that both the unknown and known substances are run on the same chromatogram to make valid comparisons.
Related flashcards
Flashcard 1 of 5
Related practice questions
Question 1 of 5
Choose an answer, get feedback, then move sideways through the set.