A) \[MnO_{2}^{-}\] and \[M{{n}^{3+}}\]
B) \[M{{n}^{3+}}\] and \[M{{n}^{2+}}\]
C) \[M{{n}^{2+}}\] and \[M{{n}^{3+}}\]
D) \[Mn{{O}_{2}}\] and \[M{{n}^{2+}}\]
E) \[M{{n}^{2+}}\] and \[Mn{{O}_{2}}\]
Correct Answer: D
Solution :
In alkaline medium, \[KMn{{O}_{4}}\] first reduced in manganate & then in insolusle manganese dioxide. \[2MnO_{4}^{-}+{{H}_{2}}O\to 2Mn{{O}_{2}}+2O{{H}^{-}}+3[O]\] In acidic medium, Manganous sulphate formed \[MnO_{4}^{-}+8{{H}^{+}}+5{{e}^{-}}\to M{{n}^{2+}}+4{{H}_{2}}O\].
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