JEE Mains · Chemistry · STD 12 - 4. d and f- block elements
Which one of the following species is stable in aqueous solution ?
- A \(Cr^{2+}\)
- B \(MnO_4^{2 - }\)
- C \(MnO_4^{3 - }\)
- D \(Cu^+\)
Answer & Solution
Correct Answer
(B) \(MnO_4^{2 - }\)
Step-by-step Solution
Detailed explanation
In \(MnO_4^{-2}\) manganese is in \(+6\) oxidation state which is having highest stability. \(MnO_4^{2-}\) disproportionates in neutral or acidic solution. \(3MnO_4^{2 - }\, + \,4{H^ + }\, \to \,2MnO_4^{2 - }\, + \,Mn{O_2}\, + \,2{H_2}O\)
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