D-And F-Block Elements Ques 451

Question: Which one of the following species is stable in aqueous solution-

Options:

A) $ C{{r}^{2+}} $

B) $ MnO_4^{-} $

C) $ MnO_4^{3-} $

D) $ C{{u}^{+}} $

Show Answer

Answer:

Correct Answer: B

Solution:

In $ MnO_4^{2-} $ manganese is in + 6 oxidation state which is having highest stability.

$ MnO_4^{2-} $ disproportionates in neutral or acidic solution.

$ 3MnO_4^{2-}+4{{H}^{+}}\xrightarrow{{}}2MnO_4^{2-}~+MnO_2+2H_2O $



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