What is the name and formula of a coordination compound comprising of two types of complex ions: one, a complex ion of Cr (III) with ethylenediamine, having a coordination number of 6; the other a complex of Ni(II) with CN-, having a coordination number of 4.
a. Trisethylendiaminechromate (III) ion
C6H24Cl3CrN6 • 3.5H2O
b. Tetracyanidonickelate (II) ion
C4N4Ni-2
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