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The basic character of the transition metal monoxides follows the order (Atomic No. Ti = 22, V = 23, Cr = 24, Fe = 26):

1. TiO > VO > CrO > FeO
2. VO > CrO > TiO > FeO
3. CrO > VO > FeO > TiO
4. TiO > FeO > VO > CrO

Correct answer: TiO > VO > CrO > FeO

Solution

The basic character of transition metal monoxides decreases as the oxidation state of the metal increases, which is linked to the increasing covalent character. TiO has the lowest oxidation state (+2), making it the most basic, followed by VO, CrO, and FeO.

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