Question detail

Which statement would earn credit for Explain that a pure substance produces a single spot on a chromatogram.?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

Purity, formulations and chromatography

Question

A. Multiple spots
B. No spots
C. A single spot
D. A blurred line

Answer

The correct answer is A single spot. 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 A single spot. The answer stays inside Purity, formulations and chromatography by linking the observation to the conclusion instead of naming a substance without evidence. Other options are weaker when they confuse gas tests, flame colours, ion-test precipitates, chromatography evidence, or pure-substance/formulation wording.

Common mistake

Misunderstanding Pure Substances

Students often think that a pure substance can produce multiple spots on a chromatogram.

Remember that a pure substance will always produce a single spot on a chromatogram, indicating it is not mixed with any other substances.

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