the third is blue. Considering the spectrochemical series and the relative magnitudes of r and a try to acsign each colour to one of the complexes. [Co(NH3)]2v [Co(OH2)6]2 ( CoCl4]2 23) What is the coardination number and oridation state of the central atom in [PtC2(en)] ? A) 2,0 B) 4,0 C) 3, D D) 2,2 E) 4,+2 24) K2CrO4 is a d tetrahedral complex that is bright yellow in color. What accounts for this color? (a) MLCT (b) LMCC (c) etdt transition (d) t1 Pe dd transition