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 Form 1 Chemistry Simple Classification of Substances Questions and Answers

A piece of chromatography paper was spotted with coloured inks obtained from pens labelled 1 to 6. The diagram below shows the spots after chromatogram was developed.
(a) Which two pens contained the same pigment?
(b) Which pen contained only one pigment?
(c) According to the chromatogram, which pigments are present in the ink of pen number 6?

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