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 $
