The ligands which can get attached to the central metal ion through more than one atom are called

Given below are two statements :
Statement $I :$ The identification of $Ni^{2+}$ is carried out by dimethyl glyoxime in the presence of $NH_{4}OH$.
Statement $II :$ The dimethyl glyoxime is a bidentate neutral ligand.
In the light of the above statements,choose the correct answer from the options given below:

The neutral ligand is

$[NiCl_4]^{2-}$ and $[Ni(CN)_4]^{2-}$ show similarity in

Mohr's salt is

The name of the ring structure complex compound formed between a metal ion and a polydentate ligand is . . . . . . .