${{\text{(EDTA)}}^{4 - }}$, the ethylenediaminetetraacetate anion, is a chelate ligand with the following structure.

It has been found to inhibit the ${\text{F}}{{\text{e}}^{2 + }}$ catalysed oxidation of raw beef. Explain why ${{\text{(EDTA)}}^{4 - }}$ can be described as a chelate ligand.

hexadentate/polydentate/crab-claw (type) ligand which coordinates to the metal/iron / OWTTE;

In (d), very few candidates knew why ${{\text{(EDTA)}}^ - }$ can be described as a chelate ligand which again showed a clear weakness of a key chemical concept within this option.