Dimethyl glyoxime gives a red precipitate with $Ni^{2+}$,which is used for its detection. To get this precipitate readily,the best $pH$ range is

$CO$ (Carbon monoxide) is a neutral oxide of carbon,but it acts as a very strong field ligand and associates with metals to form complex compounds. These complex compounds are very useful in metallurgical processes. $CO$ is a poisonous gas because:

Coordination compounds are of great importance in biological processes. In this context,which of the following statements is $NOT$ correct?

Which chelating ligand is used to remove excess $Cu$ poisoning in plants and animals?

The complex $[Cu(H_2O)_4]^{2+}$ absorbs light in the yellow region. What color will it emit as its complementary color?

Which ligand is used for the treatment of lead poisoning?