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Which of the following species contains an atom in the +6 oxidation state?

1. [MnO4]⁻
2. [Cr(CN)6]³⁻
3. Cr2O3
4. CrO2Cl2

Correct answer: CrO2Cl2

Solution

In chromyl chloride CrO2Cl2, Cr is +6 (2 O at -2 and 2 Cl at -1). The stored Cr2O3 has Cr in +3, and MnO4- is +7, [Cr(CN)6]3- is +3.

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