To the given white powder form of zinc iodide ZnI2 the following two tests are positive they are 1)n Iodide ion (I- ) 2) Zinc (II) ion (Zn2+ ) The other three tests are not give positive . We know that compound has analysed by chemical into ions only. Hence here for the given compound only two ions possible to give test. Tri iodide (I3 - ) is not formed. Solution To the given white powder form of zinc iodide ZnI2 the following two tests are positive they are 1)n Iodide ion (I- ) 2) Zinc (II) ion (Zn2+ ) The other three tests are not give positive . We know that compound has analysed by chemical into ions only. Hence here for the given compound only two ions possible to give test. Tri iodide (I3 - ) is not formed..