Chromatography — Paper 2 · IGCSE Chemistry (9-1) 0971

2 Chromatography is a technique used to separate coloured dyes. Which dye has an Rf value of 0.7? solvent front baseline A B C D dyes

1 marks

Answer: D

This question in 0971/21 May/June 2018

3 The measurements from a chromatography experiment using substance F are shown. The diagram is not drawn to scale. solvent front distance moved by F 100 mm 90 mm 55 mm 15 mm baseline What is the Rf value of F? A 0.55 B 0.61 C 0.90 D 1.64

1 marks

Answer: B

This question in 0971/21 May/June 2019

3 Substance Q was investigated using chromatography. The chromatogram is shown. The diagram is not drawn to scale. solvent front Q 129 mm 114 mm 83 mm baseline 13 mm Q What is the Rf value of Q? A 0.60 B 0.64 C 0.69 D 0.72

1 marks

Answer: C

This question in 0971/22 Oct/Nov 2019

3 The chromatogram for an unknown dye is shown. solvent front 12 cm 15 cm 9 cm 2 cm What is the Rf value of the dye? A 0.60 B 0.64 C 0.75 D 0.82

1 marks

Answer: C

This question in 0971/21 May/June 2020

3 Paper chromatography is used to determine the Rf values for four different food colourings. Which food colouring has an Rf value of 0.6? solvent front 25 20 15 distance / cm 10 5 baseline 0 A B C D

1 marks

Answer: C

This question in 0971/22 May/June 2020

2 A chromatography experiment is carried out to analyse the pigments present in four different types of leaf. The student carrying out the experiment forgot to complete his table of results, which is shown. distance number of colour of distance travelled plant travelled by pigments identified from the origin by Rf value leaf the solvent identified pigments each pigment (cm) front (cm) green green: 3.0 green: 0.81 maple F 3.7 / yellow yellow: 3.1 yellow: 0.83 green green: 2.5 green: 0.78 laurel 2 G / yellow yellow: 2.5 yellow: 0.78 green green: 2.9 green: 0.83 lime 3 / yellow 3.5 yellow: 3.0 yellow: 0.86 / orange orange: 2.7 yellow: 0.77 green green: 2.8 green: 0.80 ash 3 / yellow 3.5 yellow: 3.0 yellow: H / orange orange: 2.7 orange: 0.77 Which row identifies the values of F, G and H? F G H A 2 3.2 0.80 B 3 3.5 0.83 C 2 3.2 0.86 D 3 3.5 0.78

1 marks

Answer: C

This question in 0971/22 Oct/Nov 2020

4 In the chromatography experiment shown, which label represents the solvent front? A B D C

1 marks

Answer: A

This question in 0971/22 Oct/Nov 2020

3 Which statement about paper chromatography is correct? A A solvent is needed to dissolve the paper. B Paper chromatography separates mixtures of solvents. C The solvent should cover the baseline. D The baseline should be drawn in pencil.

1 marks

Answer: D

This question in 0971/21 May/June 2021

2 A mixture of colourless compounds is separated using chromatography. Which type of reagent is used to detect these compounds after separation? A a dehydrating agent B a locating agent C an oxidising agent D a reducing agent

1 marks

Answer: B

This question in 0971/22 May/June 2021

3 Which statement about paper chromatography is correct? A A solvent is needed to dissolve the paper. B Paper chromatography separates mixtures of solvents. C The solvent should cover the baseline. D The baseline should be drawn in pencil.

1 marks

Answer: D

This question in 0971/22 May/June 2021

3 A chromatogram of a single substance T is shown. solvent front 3 1 4 2 baseline Which measurements are used to find the Rf value of T? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: D

This question in 0971/22 May/June 2022

3 The chromatogram obtained using four substances, J, K, L and M, is shown. solvent front baseline J K L M Which statement about M is correct? A It is a mixture of J and K only. B It is a pure substance. C It is a mixture of J, K and L. D It is a mixture of J, K and an unknown substance.

1 marks

Answer: D

This question in 0971/22 Oct/Nov 2022

40 Which chromatogram shows how the Rf value of a substance is calculated? A B C D x y x x x y y y Rf = y Rf = y Rf = x Rf = x x x y y

1 marks

Answer: B

This question in 0971/21 May/June 2023

39 Two compounds, M and N, are dissolved in water and separated by chromatography. The results are shown. solvent front N 10 cm M 2 cm baseline What is the Rf value of M and which compound is most soluble in water? most soluble Rf value of M compound A 0.2 M B 0.2 N C 5.0 M D 5.0 N

1 marks

Answer: B

This question in 0971/22 May/June 2023

40 Substance Q is investigated using chromatography. The chromatogram is shown. The diagram is not drawn to scale. solvent front Q 129 mm 114 mm 83 mm baseline 13 mm Q What is the Rf value of Q? A 0.60 B 0.64 C 0.69 D 0.72

1 marks

Answer: C

This question in 0971/22 Oct/Nov 2023

40 Which statement about chromatography is correct? A It is not possible for two different substances to have the same Rf value. B It is only possible to use chromatography on substances which have a colour. C It is possible to use chromatography on colourless substances using a locating agent. D The Rf value of a substance =

1 marks

Answer: C

This question in 0971/21 May/June 2024

40 Chromatography is used to separate and analyse mixtures of soluble substances. The first steps of the process are listed. ● apply sample to baseline ● develop chromatogram in solvent What is the next step in the process to detect soluble colourless substances? A calculate the Rf values B compare the results with known substances C count the number of spots D use a suitable locating agent

1 marks

Answer: D

This question in 0971/22 Oct/Nov 2025