Question

Which transition metal does not form ‘MO’ type oxide? (M = transition metal)

• A. \( V \)
• B. \( Cr \)
• C. \( Mn \)
• D. \( Sc \)

Hint:

Transition metals exhibit multiple oxidation states, but their preferred oxidation state determines the type of oxides they form. Elements like scandium, which predominantly exist in the \( +3 \) state, do not form \( MO \) type oxides.

Answer 1

The Correct Option is D

Step 1: Understanding the nature of transition metal oxides Transition metals commonly form oxides in different oxidation states. The general formula \( MO \) is observed for several transition metals where the oxidation state of metal is \( +2 \).
Step 2: Examining each option
- Vanadium (V): Forms vanadium(II) oxide \( VO \).
- Chromium (Cr): Forms chromium(II) oxide \( CrO \).
- Manganese (Mn): Forms manganese(II) oxide \( MnO \).
- Scandium (Sc): Does not form \( ScO \) because scandium primarily exists in the \( +3 \) oxidation state, leading to the formation of \( Sc_2O_3 \) rather than \( ScO \).
Step 3: Conclusion Since scandium does not form \( MO \)-type oxides but instead forms \( Sc_2O_3 \), the correct answer is \( Sc \).