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 (-5[1])colossal magnetoresistance. Mas Subramanian (15[1])complexed ions of this metal with yttrium and indium to create the first synthetic blue pigment in over 200 years. (-5[1])It’s not nickel, but iron spinels containing zinc and this metal make up (*) soft 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 (10[1])of this metal with a plus seven oxidation state (10[1])and four oxygen atoms. For 10 points, name this transition metal found in a dark purple oxidizing solution. (0[1])■END■ (10[1])

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