The correct order of increasing oxidising power of given
species is
MnO2 < Cr20?-
MnO2
voz
Cr20 - < Voz < MnO4
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Manganese dioxide, a compound with the formula MnO2, is used as a catalyst for rapid oxidation of dissolved iron and manganese, present in the form of ferrous and manganese powder, in contact filters. These salts are oxidized by dissolved oxygen to an insoluble ferric and manganic acid.
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