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  4. In the following transition metals, the maximum number of oxidation states are exhibited by

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Q. In the following transition metals, the maximum number of oxidation states are exhibited by

AIPMTAIPMT 1980The d-and f-Block Elements

Solution:

Manganese shows maximum number of oxidation states because it has $5$ unpaired electrons in $3d$ and also contains $2$ electrons in $4s$ sub-shell.
$+ 2 + 3 + 4 + 5 + 6 + 7$
Other metals show the following oxidation states
$Cr = +2 +3 +4 +5 +6$
$Fe = +2 +3$
$Ti = +2 +3 + 4$