A clean strip of magnesium is left in blue copper(II) sulfate solution for 10 minutes. Which observations are correct?
The solution stays blue and no coating forms on the magnesium.
The solution turns colourless and a brown coating forms on the magnesium.
The solution turns darker blue and a grey coating forms on the magnesium.
The solution turns colourless and the magnesium strip is unchanged.
86 exam-style questions on AQA GCSE Chemistry 4.1 Reactivity of metals, covering 4.1.1 Metal oxides, 4.1.2 The reactivity series, 4.1.3 Extraction of metals and reduction, and 4.1.4 Oxidation and reduction in terms of electrons. Each one has a worked solution and a mark scheme showing where the marks go.