Answer to Question #213668 in General Chemistry for rahul

Question #213668

Calculate the oxidation of Cr in Cr2O72-

1
Expert's answer
2021-07-09T05:16:17-0400

In the dichromate ion, the oxidation number of chromium is+6. The sum of the oxidation numbers in Cr2O72-, a polyatomic ion, is -2, the charge of the ion.

We assign -2 as the oxidation number for each oxygen, and x as the oxidation number of each chromium and write the following equation: 2x + 7(-2) = - 2.


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