A) \[M{{n}^{2+}}\]reacts with\[MnO_{4}^{-}\]in acid solution to form\[Mn{{O}_{2}}\]
B) \[Mn{{(Mn{{O}_{4}})}_{2}}\]is stable in acid solution
C) \[Mn{{O}_{2}}\]disproporttbnates to\[M{{n}^{2+}}\]and \[MnO_{4}^{-}\] in acid solution
D) None of the above
Correct Answer: A
Solution :
\[2MnO_{4}^{-}+3M{{n}^{2+}}+2{{H}_{2}}O\xrightarrow[{}]{{}}5Mn{{O}_{2}}+4{{H}^{+}};\] \[E{}^\circ =0.47\,V\] Thus, cell reaction in which\[M{{n}^{2+}}\]on reaction with\[MnO_{4}^{-}\]forms\[Mn{{O}_{2}}\]in acidic medium.You need to login to perform this action.
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