In which compound does manganese have a +6 oxidation number?A.MnOB.MnO2C.K2MnO4D.KMnO4
Question
In which compound does manganese have a +6 oxidation number?
A. MnO
B. MnO2
C. K2MnO4
D. KMnO4
Solution
The oxidation number of manganese in the given compounds can be determined as follows:
A. MnO: Here, the oxidation number of oxygen is -2. Therefore, to balance this, the oxidation number of Mn must be +2.
B. MnO2: Here, the oxidation number of oxygen is -2. Since there are two oxygen atoms, the total oxidation number due to oxygen is -4. Therefore, to balance this, the oxidation number of Mn must be +4.
C. K2MnO4: Here, the oxidation number of K is +1 and that of O is -2. Since there are two K atoms and four O atoms, the total oxidation number due to K is +2 and that due to O is -8. Therefore, to balance this, the oxidation number of Mn must be +6.
D. KMnO4: Here, the oxidation number of K is +1 and that of O is -2. Since there is one K atom and four O atoms, the total oxidation number due to K is +1 and that due to O is -8. Therefore, to balance this, the oxidation number of Mn must be +7.
Therefore, manganese has a +6 oxidation number in compound C, K2MnO4.
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