Manganese (III) is a strong oxidizing agent because Mn in +3, oxidation state having 4 electrons in its d orbital. The d orbital is stable when it is completely half-filled so after the gain of an electron the total electron in d orbital 5 and now Mn in +3 state is acting as a strong oxidizing agent and highly stable. Cr in the +2 oxidation state act as a strong reducing agent means by the loss of one electron it gets stability. So the d orbital of Cr contains 4 electrons and by losing one electron its configuration is d3 which is highly stable, the Cr in +2 used as reducing agent. Final Answer The Cr in the +2 state act as a reducing agent for the stability and Mn in +3 state acts as an oxidizing agent and gain its stability.
