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  4. The basic character of the transition metal monoxide follows the order

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Q. The basic character of the transition metal monoxide follows the order

AIIMSAIIMS 2007

Solution:

Larger the size of a cation, lesser is its polarising power. A cation with lesser polarising power means lesser covalent character or more ionic character of its compound. A metal oxide with more ionic character will be more basic. The correct order of $M^{2+}$ ionic radii is as follows
$Ti ^{2+}> V ^{2+}> Cr ^{2+}> Fe ^{2+}$
Ionic character of oxides in decreasing order, is as follows
$TiO > VO > CrO > FeO$
This is also the order of basic character.