Test: Coordination Compounds - 1 - NEET MCQ

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: H₂O Water (H₂O) 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.

• The coordination number refers to the number of bonds formed between the central metal ion and surrounding ligands.
• In [Cr(NH3)3(H2O)3], chromium (Cr) is surrounded by three ammonia (NH3) molecules and three water (H2O) molecules.
• Each ligand forms one bond with the chromium ion, totaling six bonds.
• Thus, the coordination number of chromium in this complex is 6.

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.

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.MgCl₂.6H₂O is double salt

In A one and more different types of ligands are present.

Oxalate is a bidentate ligand.

Central Metal ion behave as a Lewis Acid while Ligand act as a lewis Base.

C₅H₅⁻a negative ligand.

Ligands are named 1st followed by the name of central metal ion.

Cis Platin (cis – [Pt(NH₃)₂(Cl)₂] is a anti cancer drug.

This is double salt so name is written in sequential manner.

Na₂[Fe(CN)₅NO] is Sodium nitroprusside.

dsp² is square planar geometry.

Complex carbonyls follow Sidwick's EAN rule i.e compound with EAN 36 will be relatively more stable than other metal carbonyls. Iron pentacarbonyl has EAN number of 36 = Z−X+Y = (26−0+2x)
[Z = atomic number, X = oxidation state of metal, Y= total electrons donated by ligand]
∴x = 5. So, the formula will be Fe(CO)5.

Bis(acetylacetonato)oxovanadium(IV) has square pyramidal geometry.

[Ni(CO)₄] has tetrahedral geometry so hybridisation is sp³

Primary valency is equal to no. of ligands attachted which are negatively charges.

EAN = 28 (Z) – 2 (oxidation number) + 2*4 (CN) = 34

Hence A

The complex [PtCl₃(NH₃)₃]Cl has only one ionisable chlorine