In which conversion is the metal reduced?
Cr3+→Cr2O72−\text{Cr}^{3+} \rightarrow \text{Cr}_2\text{O}_7^{2-}Cr3+→Cr2O72−
VO2+→VO2+\text{VO}^{2+} \rightarrow \text{VO}_2^{+}VO2+→VO2+
FeO42−→Fe3+\text{FeO}_4^{2-} \rightarrow \text{Fe}^{3+}FeO42−→Fe3+
CrO42−→Cr2O72−\text{CrO}_4^{2-} \rightarrow \text{Cr}_2\text{O}_7^{2-}CrO42−→Cr2O72−
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.