A) \[KMn{{O}_{4}}\]
B) \[Mn{{O}_{2}}\]
C) \[{{K}_{2}}Mn{{O}_{4}}\]
D) \[M{{n}_{2}}{{O}_{3}}\]
Correct Answer: D
Solution :
Oxidation number of \[Mn\] is x in \[M{{n}_{2}}{{O}_{3}}\] \[2x+3(-2)=0\] \[2x-6=0\] \[x=3\]
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