A) \[MnO_{4}^{2-},\,M{{n}^{3+}}\] and \[M{{n}^{2+}}\]
B) \[Mn{{O}_{2}},Mn{{O}_{2}}\]and \[M{{n}^{2+}}\]
C) \[Mn{{O}_{2}},Mn{{O}_{2}}^{+}\]and \[M{{n}^{3+}}\]
D) \[MnO,Mn{{O}_{2}}\] and \[M{{n}^{2+}}\]
Correct Answer: B
Solution :
In neutral and alkaline medium \[MnO_{4}^{-}+2{{H}_{2}}O+3{{e}^{-}}\xrightarrow{{}}Mn{{O}_{2}}+4O{{H}^{-}}\] In acidic medium: \[MnO_{4}^{-}+8{{H}^{+}}+5{{e}^{-}}\xrightarrow{{}}M{{n}^{2+}}+4{{H}_{2}}O\]
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