Academic session 2026-27, Chapter 5 in the current curriculum.
Welcome to the NCERT Solutions for Class 12 Chemistry - Chapter Coordination Compounds. This page offers a step-by-step solution to the specific question from Exercise 2, Question 1:
Explain the bonding in coordination compounds in terms of Werner’s postulates.
. With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.Explain the bonding in coordination compounds in terms of Werner’s postulates.
In order to explain the nature of bonding and structure of coordination compounds, Werner in 1893 proposed a theory called as Werner’s Coordination Theory. The postulates of theory are as follows:
1. In coordination compounds, metal atoms exhibit 2 types of valencies namely, primary and secondary valency. The primary valency is ionizable whereas the secondary valency is non- ionizable, i.e. primary valency corresponds to oxidation state and secondary valency corresponds to coordination number.
2. Every metal atom has a fixed number of secondary valencies i.e. fixed coordination number.
3. The metal atom tends to satisfy both its primary as well as secondary valencies. Primary valencies are satisfied by negative ions whereas secondary valencies are satisfied by negative or by neutral molecules.
4. The secondary valencies are always directed towards the fixed positions in space and this leads to definite geometry of the coordination compound. For example: if the metal ion has four secondary valencies, these are arranged in either tetrahedral or square planar arrangement around the central metal ion. The secondary valencies, thus, determine the stereochemistry of the complex.
The reaction between A and B is first order with respect to A and zero order with respect to B. Fill in the blanks in the following table:
| Experiment |
A/ mol L - 1 |
B/ mol L - 1 |
Initial rate/mol L - 1 min - 1 |
| I | 0.1 | 0.1 |
2.0 × 10 - 2 |
| II | -- | 0.2 |
4.0 × 10 - 2 |
| III | 0.4 | 0.4 | -- |
| IV | -- | 0.2 |
2.0 × 10 - 2 |
NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:
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Welcome to the NCERT Solutions for Class 12 Chemistry - Chapter . This page offers a step-by-step solution to the specific question from Excercise 2 , Question 1: Explain the bonding in coordination compounds in terms of Werner’s postulates.....
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