Question
Chemistry Question on properties of d block elements
The basic character of the transition metal monoxides follows the order
A
VO > CrO > TiO > FeO
B
CrO > VO > FeO > TiO
C
TiO > FeO > VO > CrO
D
TiO > VO > CrO > FeO
Answer
TiO > VO > CrO > FeO
Explanation
Solution
The correct answer is D) TiO > VO > CrO > FeO
The larger the size of a cation, the lesser its polarising power. A cation with lesser polarising power means a 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 M2+ ionic radii is as follows Ti2+ > V2+ > Cr2+ > Fe2+.
The ionic character of oxides in decreasing order is as follows TiO > VO > CrO > FeO. This is also the order of basic character.
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