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1.9 Separation Techniques - Chromatography (Year 10 Chemistry)

The following test is covering '1.9 Separation Techniques - Chromatography' for Year 10 Chemistry.
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Question 1
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Paper chromatography separates substances mainly based on what property?
Which characteristic leads to substances moving differently on chromatography paper?
What does a higher Rf value indicate about a substance?
Which option correctly describes chromatography’s working process?
What is meant by the Rf value in chromatography?
Why should the level of solvent be below the spot of sample initially?
When is chromatography complete?