A-LevelChemistryAnalytical techniques9701/12 · Oct/Nov 2014 · Q391 Mark

For which mixtures of reagents are the colour changes described correctly? [Table with columns: reagents, colour change] 1 pentanal + hot, acidified potassium dichromate(VI) orange to green 2 pentan-2-one + warm Fehling's reagent no change 3 cyclohexane + cold, acidified potassium manganate(VII) purple to colourless

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

A1, 2 and 3 are correct

B1 and 2 only are correct

C2 and 3 only are correct

D1 only is correct

✓ Correct answer

B: 1 and 2 only are correct

Oracle Prep sorts past-paper questions by topic, so you can drill Analytical techniques and see which topics are most likely to come up next.

Topic: Analytical techniques, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2014 Paper 1 Variant 2, question 39.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content