Work out the oxidation state of manganese and chromium in these compounds potassium permanganate and sodium dichromate please show the workings for this.

Work out the oxidation state of manganese and chromium in these compounds potassium permanganate and sodium dichromate please show the workings for this.

what is the oxidation state of the polyatomic anions permanganate(VII) and dichromate (VI) please show the workings for this.
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