The element which shows only one oxidation state other than its elemental form is :

Question

Among the following the isoelectronic species are
I. $Mg^{2+}, Al^{3+}, F^-$
II. $O^{2-}, F^-, N^{3-}$
III. $K^+, Ca^{2+}, Sc^{3+}$
IV. $Mn^{2+}, Fe^{3+}, V^{3+}$

Answer 1

Elemental Oxidation State Analysis:

Cobalt (Co): Typically displays +2 and +3 oxidation states.
Scandium (Sc): Primarily exhibits a +3 oxidation state; other stable states are uncommon.
Titanium (Ti): Exhibits common oxidation states of +2, +3, and +4.
Nickel (Ni): Commonly displays +2 and +3 oxidation states.

Determination:

Excluding its elemental form, Scandium is the sole element listed with a singular stable oxidation state (+3). Therefore, Option (2) is the correct selection.

The element which shows only one oxidation state other than its elemental form is :

The Correct Option is B

Solution and Explanation

Elemental Oxidation State Analysis:

Determination:

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