Which of the following exhibits only a +3 oxidation state?

Question

Accepted Answer

According to the NCERT Table 4.11 detailing the oxidation states of Actinium and Actinoids:
1.  **Actinium (Ac, Z=89):** Shows only the **+3** oxidation state.
2.  **Thorium (Th, Z=90):** Predominantly shows the **+4** oxidation state (NCERT lists only +4 for Th).
3.  **Protactinium (Pa, Z=91):** Exhibits +3, +4, and +5 oxidation states.
4.  **Uranium (U, Z=92):** Exhibits +3, +4, +5, and +6 oxidation states.

Thus, Actinium (Ac) is the only element among the options that exhibits exclusively the +3 oxidation state .

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