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Among the ionic species, Sc^(3+), Ce^(4+...

Among the ionic species, `Sc^(3+)`, `Ce^(4+)` and `Eu^(2+)`, which one is a good oxidising agent? Give a suitable reason for your answer. (Atomic nos: Sc = 21, Ce = 58, Eu = 63).

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Why Sm^(2+) , Eu^(2+) and Yb^(2+) ions in solutions are good reducing agents but an aqueous solution of Ce^(4+) is a good oxidising agent?

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