WHY Eu2+ ,Yb2+, are strong reducing agent whereas Tb4+ is an oxidising agent?
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Because it does not combine with oxygen ....
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But some of the lanthanides such as Eu ,Yb and Tb exist in +2 and +4 oxidation state.
Thus to revert to thye stable +3 oxidation state.
Thus Eu2+ gets oxidised to Eu+3 oxidation state and Yb.
Similarly Tb+4 gets reduced to Tb+3 in aqueous solution and thus acts as a good oxidising agent.
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