6. Chemical Quantities & Aqueous Reactions

What is the oxidation half-equation for the reaction between aluminium and oxygen in the formation of Al2O3?

What is the oxidation number of hydrogen (H) in the compound HPO4^2-?

What is the oxidation number of manganese in MnO2?

What is the oxidation number of arsenic in H₂AsO₄⁻?

What is the oxidation state of an individual sulfur atom in MgSO4?

What is the oxidation state of each individual carbon atom in the oxalate ion (C₂O₄²⁻)?

What is the oxidation state of the central metal in Na2[V(C2O4)3]?

What is the oxidation state of the central metal in [Cr(en)3]Cl3?

What is the oxidation state of the central metal ion in K₂[Cr(CN)₆]?

What is the oxidation state of the central metal ion in K2[Ni(CN)4]?

What is the oxidation state of the central metal ion in the complex [Cu(NH3)4]Br2?