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In +2 oxidation state, which of the following lanthanoids act as reducing agents?
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$\mathrm{Eu}, \mathrm{Yb}$
Both $\mathrm{Eu}^{+2}$ and $\mathrm{Yb}^{+2}$ tends to acquire common oxidation state of +3 by loosing 1 electron and becomes highly stable.
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