CAIE IGCSE Chemistry 12.3.2 Interpret Simple Chromatograms to Questions
Work through real CAIE IGCSE Chemistry questions to identify unknown substances, mixture components and chromatogram limitations.
- Syllabus
- 2026–2028
- Course
- Chemistry 0620
Exam points
- interpret multiple spots as evidence that a sample is a mixture rather than a pure substance
- identify an unknown substance by comparing spot positions or R_f values with known substances
- interpret matching spots and R_f values to determine which dyes or substances are present in a mixture
- explain limitations including overlapping or identical R_f values, insolubility and locating-agent response
CAIE IGCSE Chemistry 12.3.2 Interpret Simple Chromatograms to Questions question 1
The chromatogram obtained using four substances, J, K, L and M, is shown.
Which statement about M is correct?
A
It is a mixture of J and K only.
B
It is a pure substance.
C
It is a mixture of J, K and L.
D
It is a mixture of J, K and an unknown substance.
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