A) \[KMn{{O}_{4}}\]
B) \[{{K}_{2}}Mn{{O}_{4}}\]
C) \[Mn{{O}_{2}}\]
D) \[Mn{{O}_{3}}\]
Correct Answer: C
Solution :
The oxidation number of \[Mn\] in \[Mn{{O}_{2}}\] \[=x+(-2\times 2)=0\] \[x-4=0\] \[x=4\]
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