Coordination Compounds

Coordination compounds are extensively used in medicine because:

1. All coordination compounds are poisonous.
2. They are completely insoluble in water.
3. Some coordination compounds possess important biological and therapeutic applications.
4. They never react with biomolecules.

EDTA is widely used in complexometric titrations because it is a:

1. Monodentate ligand
2. Bidentate ligand
3. Hexadentate ligand
4. Ambidentate ligand

The exceptional stability of complexes containing multidentate ligands is known as:

1. Crystal field effect
2. Chelate effect
3. Common ion effect
4. Inductive effect

Which of the following complexes is expected to be diamagnetic?

1. [Fe(H2O)6]2+
2. [CoF6]3-
3. [Fe(CN)6]4-
4. [Mn(H2O)6]2+

According to Crystal Field Theory (CFT), the splitting of d-orbitals in coordination compounds is caused by:

1. Formation of covalent bonds between metal and ligand
2. Electrostatic interaction between the metal ion and ligands
3. Transfer of electrons from ligand to metal
4. Nuclear fusion of metal atoms

Which of the following ligands is considered a strong-field ligand according to the spectrochemical series?

1. F-
2. Cl-
3. H2O
4. CN-

According to Valence Bond Theory, the hybridisation of the complex [Co(NH3)6]3+ is:

1. sp3
2. dsp2
3. d2sp3
4. sp3d2

Which of the following complexes can exhibit optical isomerism?

1. [Pt(NH3)2Cl2]
2. [Co(en)3]3+
3. [Ni(CO)4]
4. [Cu(NH3)4]2+

Which type of isomerism is shown by the complex [Co(NH3)4Cl2]+?

1. Optical isomerism
2. Linkage isomerism
3. Geometrical isomerism
4. Ionisation isomerism

Which of the following ligands is classified as an ambidentate ligand?

1. NH3
2. H2O
3. NO2-
4. en (Ethylenediamine)

The correct IUPAC name of [Co(NH3)6]Cl3 is:

1. Hexaamminecobalt(III) chloride
2. Hexaamminecobalt chloride
3. Cobalt hexammine chloride
4. Hexaammine cobaltous chloride

The oxidation state of iron in [Fe(CN)6]4- is:

1. +1
2. +2
3. +3
4. +4

Which of the following is a bidentate ligand?

1. NH3
2. H2O
3. Ethylenediamine (en)
4. Cl-

The coordination number of cobalt in the complex [Co(NH3)5Cl]Cl2 is:

1. 4
2. 5
3. 6
4. 7

According to Werner's coordination theory, the number of ions that satisfy the primary valency of a metal ion is equal to its:

1. Coordination number
2. Oxidation state
3. Secondary valency
4. Magnetic moment