Question detail
In paper chromatography, what does a single spot on the chromatogram indicate about the substance being tested?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Purity, formulations and chromatography
Question
In paper chromatography, what does a single spot on the chromatogram indicate about the substance being tested?
Answer
A high-scoring answer should explain describe how paper chromatography separates soluble substances such as coloured inks or food colourings. Use evidence before identification: name the relevant test or measurement, state the observation, and then connect the result to Chromatography.
Explanation
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. A complete answer should use the approved objective wording, include the relevant evidence, and avoid unsupported identification claims.
Common mistake
Misunderstanding Chromatography
Students often think that chromatography separates substances based on their color alone.
Emphasize that chromatography separates substances based on their solubility and interaction with the stationary and mobile phases, not just their color.
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