Which of the following exhibits only +3 oxidation state?

46 2012 AIPMT-MAINS The d- and f-Block ElementsActinoids Easy
Which of the following exhibits only +3 oxidation state?
A Pa
B U
C Th
D Ac

Detailed Solution

Ac: $[Rn]6d^17s^2$. It loses its three valence electrons to reach the noble gas configuration, so it shows only the +3 oxidation state.
Th shows +4, Pa shows +4 and +5, and U shows +3 to +6.

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