ElectroChemistry oxidation-reduction

[disneychannel]

How do you know when a species can be oxidized or reduced my an ion?
For ex. Which of the species can be oxidized by H+ and which species can be reduced by H₂?
Ce⁴⁺, Ce³⁺, Fe²⁺,Fe³⁺,Fe, Mg²⁺,Ni²⁺,Sn

 

[Borek]

Depending on the level you should either use reactivity series or redox potentials from tables - or use redox potentials from tables and Nernst equation.