Chemistry - Complete d-block Question with Solution | TestHub

${\mathrm{MnO}}_4^{-}$changes from purple to colourless in acidic solution while ${\mathrm{MnO}}_4^{2-}$ is stable in acidic medium. Yellow coloured ${\mathrm{CrO}}_4^{2-}$ changes to orange coloured ${\mathrm{Cr}}_2{\mathrm{O}}_7^{2-}$ on acidifying and ${\mathrm{FeO}}_4^{2-}$ decomposes.