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Which of the following pairs contains compounds in which the metal in each case is present in its maximum possible oxidation state?

1. [Fe(CN)6]3−, [Co(CN)6]3−
2. CrO2Cl2, MnO4−
3. TiO3−, MnO2
4. [Co(CN)6]3−, MnO3

Correct answer: CrO2Cl2, MnO4−

Solution

CrO2Cl2 (Cr +6) and MnO4- (Mn +7) both have the metal at its maximum oxidation state. The stored pair includes MnO2 (Mn +4), which is not the maximum.

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