A supplier needs a container to store zinc sulfate solution. The container must be made of a metal that does not react with the solution. Four metals, W, X, Y and Z, are being considered. A technician carries out four tests. In each test, one metal is added to a sulfate solution. All the tests are carried out under the same conditions.
| Metal added | Solution | Observation |
|---|---|---|
| W | zinc sulfate | a coating of zinc forms on W |
| Y | W sulfate | a coating of W forms on Y |
| W | Z sulfate | no change |
| zinc | X sulfate | a coating of X forms on the zinc |
Which metal could be used to make the container?
X
Z
Y
W
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.