Which row in the table shows the correct oxidation state and co-ordination number of nickel in the complex [Ni(en)3]SO4[\text{Ni}(\text{en})_3]\text{SO}_4[Ni(en)3]SO4 (where en\text{en}en represents the neutral bidentate ligand ethane-1,2-diamine)?
| Oxidation state | Co-ordination number | |
|---|---|---|
| A | +2 | 3 |
| B | +2 | 6 |
| C | +3 | 3 |
| D | +3 | 6 |
Oxidation state: +2+2+2, Co-ordination number: 333
Oxidation state: +2+2+2, Co-ordination number: 666
Oxidation state: +3+3+3, Co-ordination number: 333
Oxidation state: +3+3+3, Co-ordination number: 666
63 exam-style questions on AQA A Level Chemistry Transition metals (A-level only), covering General properties of transition metals (A-level only), Substitution reactions (A-level only), Shapes of complex ions (A-level only), Formation of coloured ions (A-level only), Variable oxidation states (A-level only), and Catalysts (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.