Round 1: Tossup 10

Observing electron transfers between tri- and tetravalent ions of this metal led Clarence Zener to propose double exchange. This metal occupies the B site of perovskites displaying colossal magnetoresistance. (15[1])Mas Subramanian complexed ions of this metal with yttrium and indium to create the first synthetic (15[1])blue pigment in over (15[1])200 years. It’s not nickel, but iron spinels containing zinc and this metal make up (*) soft (-5[1])ferrites found in many transformer cores. Reducing this metal’s dioxide produces voltage in alkaline batteries. Dissolved oxygen oxidizes this metal into a brown precipitate in the first step of the Winkler test. Baeyer’s test uses a polyatomic anion of this metal with a plus seven oxidation state and four oxygen atoms. For 10 points, name this transition metal found in a dark purple oxidizing solution. ■END■ (10[2]0[1])

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