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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 the oxidation states of all atoms in a neutral molecule is zero.
2x(+1) +2x(x)+7(-2)=0, x=+6
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