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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.
Th shows +4, Pa shows +4 and +5, and U shows +3 to +6.
