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Oxidation states of Chromium

Chromium is a metal with many oxidation states, which of the following compounds has chromium in its lowest oxidation state?

Cr2O3 Cr2O7^2- MgCr2O3

Solution Preview

Oxidation numbers are sometimes difficult, but they will get easier with time. For the general solutions, you will need to consult the general rules to oxidations numbers (should be in any textbook, and in this library).

Use the rules you know to find the unknown oxidation ...

$2.19