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The d- and f-Block Elements
Oxides of Transition Metals
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Concepts tested
- Basicity of oxides across 3d series
All Questions
2003 AIPMT 1 question
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The basic character of the transition metal monoxides follows the order : (Atomic nos. Ti = 22, V = 23, Cr = 24, Fe = 26)In all these monoxides the metal is in the +2 oxidation state.
Across the 3d series (Ti to Fe), the nuclear charge increases and the ionic radius of $M^{2+}$ decreases. This increases the covalent character of the M–O bond and makes the oxide less ionic, and so less basic.
So the basic character decreases as the atomic number increases: Ti (22) $\gt$ V (23) $\gt$ Cr (24) $\gt$ Fe (26).
The order is TiO $\gt$ VO $\gt$ CrO $\gt$ FeO.