For which given species, +3 oxidation state is more P stable? W I....

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For which given species, +3 oxidation state is more
P stable?

W
I. \( \mathrm{Eu} \)
II. \( \mathrm{Gd} \)
III. La
IV. \( \mathrm{Yb} \)
(1) I and IV
(2) II and III
(3) I and III
(4) II and IV
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