Which of the following is not a transition metal? Select one: a Cd O b. Sc c. Cr O d. Fe Which of the following classes of ligands has strongest trans effect? Select one: O a. Pl.acceptor groups O b. Sigma-acceptor groups O c. Sigma-donor groups O d. Pi-donor groups The stabilization of coordination compounds due to chelation is called the chelate effect. Which of the following is the most stable complex species? Select one: O a. [Fe(H.0)]* O b. [Fe(CO).] O c. [FeCN).] O d. [Fe(C0...1 How many unpaired electrons are there in a strong field ironll) octahedral complex? Select one: O a. O b. 1 O c. 2 o d. 4