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Assignment for Class 12 Chemistry Unit 09 Coordination Compounds
Class 12 Chemistry students should refer to the following printable assignment in Pdf for Unit 09 Coordination Compounds in Class 12. This test paper with questions and answers for Class 12 Chemistry will be very useful for exams and help you to score good marks
Unit 09 Coordination Compounds Class 12 Chemistry Assignment
The compounds which contain dative bonds between metal atom and surrounding species is called co-ordination compounds .
The branch of inorganic chemistry which deals with hte study of preparation properties of coordination compound is called co-ordination chemistry.
K4[Fe(CN)6], [CuNH3)4]SO4
POINTS TO REMEMBER:
1.Coordination compounds
Coordination compounds are compounds in which a central metal atom or ion is linked to a
number of ions or neutral molecules by coordinate bonds or which contain complex ions. Examples- K4[Fe(CN)6]; [ Cu(NH3)4]SO4; Ni(CO)4
2.The main postulates of Werner’s theory of coordination compounds
i) In coordination compounds metals show two types of linkages or valencies- Primary and Secondary.
ii) The primary valencies are ionisable and are satisfied by negative ions.
iii) The secondary valencies are non- ionisable and are satisfied by neutral molecules or negative ions. The secondary valence is equal to the C.N and is fixed for a metal.
iv) The ions or groups bound by secondary linkages to the metal have characteristic spatial arrangements corresponding to different coordination nos.
3.Difference between a double salt and a complex
Both double salts as well as complexes are formed by the combination of two or more stable compounds in stoichiometric ratio.
However, double salts such as carnallite, KCl.MgCl2.6H2O, Mohr‘s salt, FeSO4.(NH4)2SO4.6H2O, potash alum, KAl(SO4)2.12H2O, etc. dissociate into simple ions completely when dissolved in water.
However, complex ions such as [Fe(CN)6]4– of K4[Fe(CN)6], do not dissociate into Fe2+ and CN– ions.
IMPOTANT TERMINOLOGY
(i) Coordination entity: It constitutes the central metal ion or atom bonded to a fixed number of ions or molecules represented within a square bracket.
(ii) Central atom/ ion: In a coordination entity,
the atom/ion to which a fixed number of ions/groups are bound in a definite geometrical arrangement around it, is called the central atom or ion.
iii) Ligands: The neutral or negative ions bound to the central metal or ion in the coordination entity.
These donate a pair/s of electrons to the central metal atom /ion. Ligands may be classified as-
a) Monodentate/Unidentate: Ligands bound to the central metal atom/ion through a single donor atom. Ex- Cl- ; H2O ; NH3 ; NO2-.
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CBSE Class 12 Chemistry Unit 09 Coordination Compounds Assignment
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Assignment for Chemistry CBSE Class 12 Unit 09 Coordination Compounds
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Unit 09 Coordination Compounds Assignment Chemistry CBSE Class 12
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Unit 09 Coordination Compounds Assignment CBSE Class 12 Chemistry
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CBSE Chemistry Class 12 Unit 09 Coordination Compounds Assignment
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