Question

The highest oxidation state observed in first row transition metal is

• A. +6
• B. +7
• C. +8
• D. +9

Answer 1

Answer: (B)

The highest oxidation state observed in the first row transition metals is $+7$.
In first row ' $Mn$ ' with outer configuration : $3d^5$,
$4s^2$ show $+7$ oxidation state, i.e.
It has $7$ electrons in outermost orbital, so has $+7$ oxidationstate.