CBSE Class 12 Chemistry Coordination Chemistry Assignment

CBSE Class 12 Chemistry Coordination Chemistry Assignment. Students are advised to refer to the attached assignments and practise them regularly. This will help them to identify their weak areas and will help them to score better in examination. Parents should download and give the assignments to their children for practice.
 
LEVEL-1 QUESTIONS
1.Define Ligand . Give one example also.
The ion or molecules which are coordinately bonded to central metalatom in the coordination entity are called ligands.
 
2. Why Coordination compounds are coloured?
Due to d-d transition.
 
3. What is Homoleptic complexes?
The complexes in which a metal is bound to only one kind of donorgroups. E.g., [Co(NH3)6]3+
 
4. What is the Oxidation no. of cobalt in K[Co(CO)4]?
+1
 
5. Explain each of the following: coordination entity, ligand, coordination number, coordination polyhedron, homoleptic and heteroleptic.
Answer
(i)Coordination entity:
A coordination entity is an electrically charged radical or species carrying a positive ornegative charge. In a coordination entity, the central atom or ion is surrounded by a suitablenumber of
neutral molecules or negative ions ( called ligands)
 
(ii)Ligands
The neutral molecules or negatively charged ions that surround the metal atom in acoordination entity or a coordinal complex are known as ligands. For example,,Cl−, −OH. Ligands are usually polar in nature and possess at least one unshared pair ofvalence electrons.
 
(iii)Coordination number:
The total number of ligands (either neutral molecules or negative ions) that get attached tothe central metal atom in the coordination sphere is called the coordination number of thecentral metal atom. It is also referred to as its ligancy.
 
(vi)Coordination polyhedron:
Coordination polyhedrons about the central atom can be defined as the spatial arrangement of the ligands that are directly attached to the central metal ion in the coordination sphere.
 
(v)Homoleptic complexes:
These are those complexes in which the metal ion is bound to only one kind of a donorgroup.
 
(vi)Heteroleptic complexes:
Heteroleptic complexes are those complexes where the central metal ion is bound to morethan one
type of a donor group.
 
6. What is meant by unidentate, didentate and ambidentate ligands? Give two examples for each.
Answer
A ligand may contain one or more unshared pairs of electrons which are called the donorsites of ligands. Now, depending on the number of these donor sites, ligands can be classifiedas follows:
(a)Unidentate ligands: Ligands with only one donor sites are called unidentate ligands. Fore.g., ,Cl− etc.
 
 
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