Explain the bonding in coordination compounds in terms of Werner’s postulates.
Werner’s postulates explain the bonding in coordination compounds as follows:
(i) A metal exhibits two types of valencies namely, primary and secondary valencies. Primary valencies are satisfied by negative ions while secondary valencies are satisfied by both negative and neutral ions.
(In modern terminology, the primary valency corresponds to the oxidation number of the metal ion, whereas the secondary valency refers to the coordination number of the metal ion.
(ii) A metal ion has a definite number of secondary valencies around the central atom. Also, these valencies project in a specific direction in the space assigned to the definite geometry of the coordination compound.
(iii) Primary valencies are usually ionizable, while secondary valencies are non-ionizable.
2. The value of Avogadro Number is
3. Nonstick kitchenwares are coated with
4. What is the chemical symbol of mercury?
5. An example of replenishable energy source is–
6. German silver is an alloy of
7. An emulsion is a colloid of a
8. When cathode rays strike a target of high atomic weight, they give rise to
9. Carbon dioxide is produced by all of the following except
10. Which of the following type of coal has the lowest proportion of volatile matter ?