Ambidentate Ligand: Nitro

• An ambidentate ligand is a type of polydentate ligand that can bind to a central atom in multiple ways because it has two or more donor atoms, but uses only one of them in forming a coordinate bond at a time.
• Nitro (NO^2- ) is an example of an ambidentate ligand. It can coordinate to the central metal atom either through the nitrogen atom (forming a nitro complex) or through one of the oxygen atoms (forming a nitrito complex).
• The other options provided do not have this property. Oxalate is a bidentate ligand, meaning it simultaneously uses both of its oxygen atoms to bind to the central atom. Carbonyl is a monodentate ligand, it can only bind through the carbon atom of the C=O group. Acetate is also a monodentate ligand, it can only bind through the oxygen atom of the C=O group.

Therefore, among the given options, only Nitro is an ambidentate ligand.

Explanation of Chelating Ligand
A chelating ligand is a molecule that forms multiple bonds with a single metal ion. In other words, it can bind to a metal ion at more than one point, creating a ring-like structure. This process is known as chelation. Chelating ligands have two or more donor atoms, which allow them to form multiple bonds with a single metal ion. These ligands are used in various fields such as medicine, chemistry, and environmental science due to their ability to sequester metal ions.

Examination of Options
A: Cl^- Chloride ion (Cl-) is a monodentate ligand, meaning it can bind to a metal ion at only one point. Therefore, it is not a chelating ligand.
B: DMG DMG, or Dimethylglyoxime, is a type of ligand that can bind to a metal ion at two points, forming a five-membered ring. Thus, DMG is a chelating ligand.

C: H₂ O Water (H₂ O) is a monodentate ligand, meaning it can bind to a metal ion at only one point. Therefore, it is not a chelating ligand.
D: OH^- Hydroxide ion (OH^-) is a monodentate ligand, meaning it can bind to a metal ion at only one point. Therefore, it is not a chelating ligand.

Conclusion
Therefore, out of the given options, only DMG (Dimethylglyoxime) is a chelating ligand. Hence, the correct answer is B: DMG .

Coordination number of the central ion is equal to no. of coordination bonds formed with surrounding ions.

Since the reagent is  BaCl₂ (aq), displacement reaction will take place. The resulting solution, if insoluble in water, will form a white precipitate. Both  BaNO₂  and  BaCl₂  are soluble in water and hence will not form a precipitate. BaSO₄ , however, is insoluble in water and hence forms a white precipitate.

Name of ligands name first in alphabetical order followed by anme of central ion.

26+2(5) = 36

oxidation state of Ag in tollen ’s reagent is +1.

Multidentate ligand always act as chelating Ligand

In A Ni has +4 oxidation state.

KCl.MgCl₂ .6H₂ O is double salt