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Between Eu and Ce which one exhibits + 2...

Between Eu and Ce which one exhibits + 2 oxidations state ?

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`Eu(4f^(7)6s^(2))` can easily form `Eu^(2+)` ion and attains a stable `4f^(7)` configuration. Or, Manganese dioxide `(MnO_(2))` is a transition metal oxide which acts as a catalyst.
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CHHAYA PUBLICATION-D - AND F - BLOCK ELEMENTS -SOLVED WBCHSE SCANNER
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