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The oxidation number of Cr in K(2)Cr(2)O...

The oxidation number of `Cr` in `K_(2)Cr_(2)O_(7)` is

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Let the oxidation number of Cr be x in `K_(2)Cr_(2)O_(7)`
`underset((2xx1))(K_(2))underset((2xxx))(Cr_(2))underset((-2xx7))(O_(7))`
`:. 2+2x-14=0or 2x=14-2=12or x=+6`.
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