Why Ln^(2+) ions are reductants and Ln^(...

Why `Ln^(2+)` ions are reductants and `Ln^(4+)` are oxidants ?

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Lanthanides are stable in `+3` oxidation state only than in other oxidation states. Thus `Ln^(2+)` ions are easily oxidised to `Ln^(3+)` ions and act as reductants. `Ln^(4+)` ions are easily reduced to `Ln^(3+)` ions and act as oxidants.

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Why `Ln^(2+)` ions are reductants and `Ln^(4+)` are oxidants ?

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