O-LevelChemistryAcids, Bases & Salts5070/11 · Oct/Nov 2016 · Q31 Mark

A paper chromatography experiment is carried out to find an Rᶠ value for Fe³⁺(aq). The result is shown. To make the spot containing Fe³⁺(aq) more visible, the paper is sprayed with aqueous sodium hydroxide so that a precipitate of iron(III) hydroxide forms. Under the conditions of the experiment, the Rᶠ of Fe³⁺(aq) is given by ......1...... and the colour of the precipitate is ......2...... . Which row correctly completes gaps 1 and 2?

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Agap 1: x/y, gap 2: red-brown

Bgap 1: x/y, gap 2: green

Cgap 1: y/x, gap 2: red-brown

Dgap 1: y/x, gap 2: green

✓ Correct answer

A: gap 1: x/y, gap 2: red-brown

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Topic: Acids, Bases & Salts, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2016 Paper 1 Variant 1, question 3.

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