Packet 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. (15[3])Mas Subramanian (15[1]-5[1])complexed ions of this metal with yttrium and indium to create the first synthetic (15[1])blue pigment in (15[1]-5[1])over (15[2])200 years. (15[2]-5[1])It’s not nickel, but iron spinels containing zinc and this metal make up (15[1])(*) soft (-5[1])ferrites found in many transformer cores. Reducing this metal’s dioxide produces voltage in alkaline batteries. Dissolved oxygen (-5[1])oxidizes this metal into a brown precipitate (10[1]-5[1])in the first step of the Winkler test. Baeyer’s test (10[1]-5[2])uses a polyatomic anion (10[1])of this metal with a plus seven oxidation (10[2])state (10[5]-5[4])and four (10[2])oxygen (10[1])atoms. (-5[1])For 10 points, name this transition metal found in a dark purple oxidizing solution. (10[2]0[1])■END■ (10[12]0[3])

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