SC-872
Chromatography
Lower Sec Science · Secondary 1 · Easy · Chromatography
A food scientist uses paper chromatography to test four food colourings P, Q, R and S against a known harmful dye H. On the chromatogram, only the spots from Q and S line up horizontally with H. Which colourings should be banned?
- Q and S only
- P and Q only
- P and R only
- P, Q, R and S
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