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  4. The highest oxidation state observed in first row transition metal is

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Q. The highest oxidation state observed in first row transition metal is

TS EAMCET 2020

Solution:

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