Question

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

• A. Cobalt
• B. Scandium
• C. Titanium
• D. Nickel

Answer 1

The Correct Option is B

Analyzing Oxidation States of Each Element:

• Cobalt (Co): Cobalt commonly exhibits oxidation states of +2 and +3 in its compounds.
• Scandium (Sc): Scandium primarily shows an oxidation state of +3 and does not commonly exhibit any other stable oxidation states in its compounds.
• Titanium (Ti): Titanium can exhibit multiple oxidation states, commonly +2, +3, and +4.
• Nickel (Ni): Nickel commonly shows oxidation states of +2 and +3.

Conclusion:

Scandium is the only element among the options that shows only one stable oxidation state (+3) other than its elemental form. The correct answer is Option (2).