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2.1 Purity and separating mixtures

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Question 2

A horticultural scientist measures the Rf values of three pure pigments found in flower petals. The same stationary phase is used with two different solvents.

PigmentRf value in solvent 1Rf value in solvent 2
J0.360.22
K0.360.67
L0.740.45

A petal extract contains pigments J, K and L.

Which result would be expected when the extract is analysed?

[1]
A

Two spots in solvent 1 and three spots in solvent 2

B

Three spots in solvent 1 and two spots in solvent 2

C

Three spots in solvent 1 and three spots in solvent 2

D

Two spots in solvent 1 and two spots in solvent 2

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2.1 Purity and separating mixtures Questions

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

102 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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