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 determine the boiling point
- B. To identify the unknown substances
- C. To measure the purity
- D. To calculate the Rf value
Answer
The correct answer is To identify the unknown 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 identify the unknown 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
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.
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