Question

Give the oxidation state of the metal for each of the following oxides of the first transition series. (Hint: Oxides of formula M₃O₄ are examples of mixed valence compounds in which the metal ion is present in more than one oxidation state. It is possible to write these compound formulas in the equivalent format MO·M₂O₃, to permit estimation of the metal’s two oxidation states.)

a. +2, +3
b. +3, +4
c. +4, +5
d. +5, +6

Answer 1

The oxidation states of the metals in the given oxides are +3, +4, +5, +6, +4, +2 and +3 or +4, +2, +1, respectively.

Step-by-step explanation:

In the first transition series, the oxidation states of the metals are as follows:

• (a) Sc2O3: +3
• (b) TiO2: +4
• (c) V2O5: +5
• (d) CrO3: +6
• (e) MnO2: +4
• (f) Fe3O4: +2, +3
• (g) Co3O4: +3, +4
• (h) NiO: +2
• (i) Cu2O: +1