What is the oxidation state of chromium in the dichromate polyatomic anion, Cr2O7^2-?
Answer and explanation
Correct answer: A. +6
Oxygen typically has an oxidation state of -2. For Cr2O7^2-: 2 (Cr) + 7 (-2) = -2, so 2 (Cr) - 14 = -2, which gives 2 (Cr) = +12, and Cr = +6. Thus, each chromium atom is in the +6 oxidation state.
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