A metal-recovery laboratory tests four metals, Q, R, S and T. Each metal is added to solutions of the salts of the other three metals. The table shows how many of the solutions each metal reacts with.
| Metal | Number of solutions reacted with |
|---|---|
| Q | 1 |
| R | 3 |
| S | 0 |
| T | 2 |
Which metal has the greatest tendency to form positive ions?
R
Q
T
S
113 exam-style questions on OCR GCSE Chemistry 4.1 Predicting chemical reactions, covering 4.1.1 Properties and trends in Groups 1, 7 and 0, 4.1.2 Properties of the transition metals, 4.1.3 Reactivity predicted from position in the Periodic Table, and 4.1.4 Reactivity of metals and the reactivity series. Each one has a worked solution and a mark scheme showing where the marks go.