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. Mas Subramanian complexed ions of this metal with yttrium and indium to create the first synthetic blue pigment in over 200 years. 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 of this metal with a plus seven oxidation state (-5[1])and four oxygen (10[1])atoms. (-5[1])For 10 points, name this transition metal found in a dark purple oxidizing solution. ■END■ (10[3])

Back to tossups

Buzzes

Summary