Solved: In many species, a transition metal has an unusually high or low oxidation

Chapter 23, Problem 23.121

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In many species, a transition metal has an unusually high or low oxidation state. Write balanced equations for the following and find the oxidation state of the transition metal in the product: (a) Iron(III) ion reacts with hypochlorite ion in basic solution to form ferrate ion (FeO4 2_), Cl_, and water. (b) Potassium hexacyanomanganate(II) reacts with K metal to form K6[Mn(CN)6]. (c) Heating sodium superoxide (NaO2) with Co3O4 produces Na4CoO4 and O2 gas. (d) Vanadium(III) chloride reacts with Na metal under a CO atmosphere to produce Na[V(CO)6] and NaCl. (e) Barium peroxide reacts with nickel(II) ions in basic solution to produce BaNiO3. (f) Bubbling CO through a basic solution of cobalt(II) ion produces [Co(CO)4]_, CO3 2_, and water. (g) Heating cesium tetrafluorocuprate(II) with F2 gas under pressure gives Cs2CuF6. (h) Heating tantalum(V) chloride with Na metal produces NaCl and Ta6Cl15, in which half of the Ta is in the _2 state. (i) Potassium tetracyanonickelate(II) reacts with hydrazine (N2H4) in basic solution to form K4[Ni2(CN)6] and N2 gas.