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Q.
When $KMnO_4$ reacts with acidified $FeSO_4$
The d-and f-Block Elements
Solution:
$FeSO_4$ is oxidised and $KMnO_4$ is reduced
In this reaction oxidation state of $Mn$ is changing from $+7$ to $+2$ while oxidation state of $Fe$ is changing from $+2$ to $+3.$