What is the oxidation state of Mn in the following compound?
$K M n O_{3}$

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Solution

The correct option is B 5
There are $3 O$ atoms so the total charge is $- 6.$
The charge on the $M n O_{3}$ ion is $- 1$
$x + (- 6) = - 1$
$x = + 5$ This is the charge on $M n .$

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