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2.1 Purity and separating mixtures

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Question 24
F

A student runs a paper chromatogram of a mixture. The diagram shows the chromatogram next to a ruler.

image

The table shows the Rf values of four substances in the same solvent.

SubstanceRf value
J0.30
K0.44
L0.60
M0.68

Which two substances are in the mixture?

[1]
A

J and L

B

J and M

C

K and L

D

K and M

Markscheme

2.1 Purity and separating mixtures Questions

  1. GCSE
  2. /Chemistry
  3. /2.1 Purity and separating mixtures

51 exam-style questions on OCR GCSE Chemistry 2.1 Purity and separating mixtures, covering 2.1.1 Pure substances and melting point data, 2.1.2 Relative formula mass and empirical formula, 2.1.3 Formulations as useful mixtures, 2.1.4 Techniques for separating mixtures, and 2.1.5 Chromatography and Rf values. Each one has a worked solution and a mark scheme showing where the marks go.

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