Which one of the following species is stable | vedclass

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(B) The stability of species in aqueous solution depends on their tendency to undergo disproportionation or oxidation-reduction reactions.$Cr^{2+}$ is

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$MnO_4^{2-}$

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(B) The stability of species in aqueous solution depends on their tendency to undergo disproportionation or oxidation-reduction reactions.$Cr^{2+}$ is a strong reducing agent and is easily oxidized to $Cr^{3+}$ in the presence of air or water.$Cu^{+}$ undergoes disproportionation in aqueous solution: $2Cu^{+} 	o Cu^{2+} + Cu$.$MnO_4^{3-}$ is highly unstable and disproportionates rapidly.$MnO_4^{2-}$ (manganate ion) is stable in strongly alkaline solutions,whereas it disproportionates in neutral or acidic media. Among the given options,$MnO_4^{2-}$ is the most stable species in specific aqueous conditions (alkaline medium).

Which one of the following species is stable in aqueous solution?

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