Question

The basic character of the transition metal monoxides follows the order
(Atomic numbers: $Ti=22,V=23,Cr=24,Fe=26$ )

• A. $VO>CrO>TiO>FeO$
• B. $CrO>VO>FeO>TiO$
• C. $TiO>FeO>VO>CrO$
• D. $TiO>VO>CrO>FeO$

Answer 1

Answer: (D)

Oxides of transition metals in low oxidation states +2 and +3 (MO, $M_{3}O_{4}$ and $M_{2}O_{3}$ ) are generally basic except $Cr_{2}O_{3}$ which is amphoteric in character.