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What is the oxidation state of Cr in K2C...

What is the oxidation state of `Cr` in `K_2Cr_2O_7`?

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`K_2^(+1)Cr_2^(x)O_7^(-2)`
`2 + 2x–14 = 0 `
`2x-12 = 0 `
`x= 6`
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