Page 448 - SUBSEC October 2017_Neat
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(iii) Name TWO commonly used mobile phase in gas-liquid chromatography.
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[2 marks]
(b) Explain the chemical principle upon which the separation of A–D can be achieved. DO NOT WRITE IN THIS AREA
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[3 marks]
(c) (i) Which of the compounds, A—D, is present in the highest concentration? DO NOT WRITE IN THIS AREA
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[1 mark]
(ii) For how long was the compound identified in (c) (i) retained on the column?
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[1 mark]
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