A) \[Mn{{O}_{2}},\,\,Mn{{O}_{2}},\,\,M{{n}^{2+}}\]
B) \[M{{n}^{2-}}_{4},\,\,M{{n}^{3+}},\,\,M{{n}^{2+}}\]
C) \[Mn{{O}_{2}},\,\,Mn{{O}^{2-}},\,\,M{{n}^{3+}}\]
D) \[MnO,\,\,Mn{{O}_{4}},\,\,M{{n}^{2+}}\]
Correct Answer: A
Solution :
\[Mn{{O}_{2}},\,\,Mn{{O}_{2}},\,\,M{{n}^{2+}}\] In neutral medium: \[2KMn{{O}_{4}}+3MnS{{O}_{4}}+2{{H}_{2}}O\,\,\to \] \[{{K}_{2}}S{{O}_{4}}\,\,+\,\,2{{H}_{2}}S{{O}_{4}}+5Mn{{O}_{2}}\] In alkaline medium: \[2KMn{{O}_{4}}+{{H}_{2}}O\,\,\to \,\,2Mn{{O}_{2}}+2KOH+3O\] In acidic medium: \[2KMn{{O}_{4}}+3{{H}_{2}}S{{O}_{4}}\,\,\to \] \[{{\operatorname{K}}_{2}}S{{O}_{4}} + 2MnS{{O}_{4}} + 5{{H}_{2}}O +5O\]
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