What is an example of an oxidation reaction practice problem?

"Balance the equation" type problems, e.g.:

`KMnO4 + HCl rarr KCl + MnCl_2 + Cl_2 + H_2O`
`KIO_3 + KI + H_2SO_4 rarr I_2 + H_2O + K_2SO_4`

"Given that X goes to Y and Z goes to W, present the balanced equation" type problems, e.g.:

`S_2O_8^(-2)` goes to `SO_4^(-2)`
`Cr^(+3)` goes to `Cr_2O_7^(-2)`
`Cl^(-)` goes to `Cl_2`
Knowing the persulfate has ammonium as a counterion and the chloride is a counterion to chrome III, in an acid medium with `H_2SO_4` as the proton donor, balance the equation

(For a simpler exercise say it's chrome III sulfate instead of chloride)

"Knowing the `E_0`s, state if the reaction is spontaneous or not" type problems, e.g.:

Choose which are the spontaneous reactions
`2Ag^0 + Zn^(+2) rarr 2Ag^+ + Zn^0`
`3 Fe + 2 CuSO_4 + 4 NaOH rarr 2 Cu + Fe_3O_2 + 2 H_2O + 2 Na_2SO_4`
With access to a potential table

If you're on a more advanced track, you can start throwing in more advanced situations, like

"The titration saga" type problems, e.g.:

A technician is analyzing the quantity of ascorbic acid in a certain brand's orange juice, knowing that it's reaction involves two electrons, and that `20,00 mL` aliquots consumed `13,20 mL`, `13,20 mL` and `13,25 mL` of a solution made by dissolving `35,7251 g` of potassium iodate in one liter, how many grams of ascorbic acid were on that juice?

Or, the "redox cell" type problems, e.g.:

Given the cell

`H_2` | `H^+` [1,000 mol/L] || `Ag` | `AgX`, `X` [1,053 mol/L]

That has `DeltaE = 0,1435 V`, determine the `Ksp` of `AgX`

And of course, any mix of these in any proportions