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1.

What is the coordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate?

Answer»

[ C u ( C N ) 4 ] 2-
Discussion
2.

Write the name & magnetic behaviour of the following: [Co(NH3)5Br]2+ ( Co = 27)

Answer»

Pentaamminebromidocobalt(III) ion, diamagnetic.
Discussion
3.

A coordination compound has the formula COCI3 6H2O. Write the hydrate isomers of the complex.

Answer»

The possible hydrate isomers of the coordination compounds having molecular formula COCI3 6H2O are as follows :

(1) [CO(H2O)6]CI3; 

(2) [CO(H2O)5CI]CI2 H2O 

(3) [CO(H2O)4CI2] Cl – 2H2O

(4) [Co(H2O)3CI3] 3H2O.
Discussion
4.

Which type of ligands forms chelates?

Answer»

Polydentate ligands forms chelates.
Discussion
5.

Define Isomers and Isomerism. How many types of Isomerism are ? Explain.

Answer»

Isomers and Isomerism

Compounds which have same molecular but different structural formulae are called isomers and the phenomenon is known as isomerism.

1. Chain Isomerism – The isomerism in which the isomers differ from each other due to the presence of different carbon chain skeletons .Example: n-butane and iso-butane.

2. Position Isomerism – the type of isomerism in which the isomers differ in the position of the functional group. Example: But-1-ene and But-2-ene.

3. Functional Isomerism – The type of isomerism in which the isomers differ in structure due to the presence of different functional groups.
Discussion
6.

Amongst the following which is the most stable complex & Why?(A) [Fe(H2O)6]3+(B) [Fe(C2O4)3]3-

Answer»

B, due to chelation.
Discussion
7.

[Fe(CN)6]4− and [Fe(H2O)6]2+ are of different colours in dilute solutions. Why? 

Answer»

The colour of a particular coordination compound depends on the magnitude of the crystal-field splitting energy, Δ.

This CFSE in turn depends on the nature of the ligand.

In case of [Fe(CN)6]4− and [Fe(H2O)6]2+ . The colour differs because there is a difference in the CFSE. Now, CN− is a strong field ligand having a higher CFSE value as compared to the CFSE value of water. This means that the absorption of energy for the intra d-d transition also differs.

Hence, the transmitted colour also differs. 
Discussion
8.

Discuss briefly giving an example in each case the role of coordination compounds in:1. Biological system2. Medicinal chemistry3. Analytical chemistry

Answer»

Role of coordination compounds in biological systems:

We know that photosynthesis is made possible by the presence of the chlorophyll pigment. This pigment is a coordination compound of magnesium. In the human biological system, several coordination compounds play important roles.

For example, the oxygen-carrier of blood, i.e. haemoglobin is a coordination compound of iron.

Role of coordination compounds in medicinal chemistry:

Certain coordination compounds of platinum (for example- cis-platin) are used for inhibiting the growth of tumours.

Role of coordination compounds in analytical chemistry:

During salt analysis, a number of basic radicals are detected with the help of the colour changes they exhibit with different reagents. These colour changes are a result of the coordination compounds or complexes that the basic radicals form with different ligands.
Discussion