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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)` is 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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AAKASH SERIES-REDOX REACTONS-Questions For Descriptive Answers
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