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a
prepare , prepare
b
prepare , reduce
c
reduce , prepare
d
reduce , reduce
answer is C.
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Detailed Solution
ozone oxidizes K2MnO4(green) to KMnO4(purple)It is used to prepare KMnO4It can not reduce KMnO4SRP of O3/O2 > SRP of MnO4-/Mn+2 > SRP of MnO4-/MnO2 > SRP of MnO4-/MnO4-2H2O2 reduces MnO4- to Mn+2 in acidic mediumH2O2 reduces MnO4- to MnO2 in alkaline medium