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What is the oxidation state of chromium ...

What is the oxidation state of chromium in potassium dichromate? 

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Let the oxidation state of `Cr` in `K_(2)Cr_(2)O_(7)` be x. The sum of oxidation states of all atoms in a neutral molecule is zero.
`2x(+1) + 2x (x)+7(-2)=0, x = +6`.
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