acid (EDTA) is a. known to form unstable complex ions with Fe3+, Hg2+, and Zn2+.
b. a monodentate ligand.
c. an effective antidote for heavy metal poisoning (e. g., Pb2 and Hg2 ).
d. not useful as a chelating agent.
e. known to form complexes with platinum that inhibit the growth of cancerous cells.