Which of the following exhibits only \( +3 \) oxidation state? [AIPMT (Mains) 2012] (a) Ac (b) \...

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Which of the following exhibits only \( +3 \) oxidation state?
[AIPMT (Mains) 2012]
(a) Ac
(b) \( \mathrm{Pa} \)
(c) \( \mathrm{U} \)
(d) \( \mathrm{Th} \)
\( P \)
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