What is Coordination Compound? How many marks carried by the chapter Coordination Compounds in class 12 board examinations? Why we study the chapter Coordination Compounds? How important the chapter Coordination Compounds is? Explain Werner’s theory of coordination compound. What do you mean by transition metals and the tern complex compounds? What are basic aspects of Coordination Compound?
Alfred Werner was the first person who formulates his ideas about the structures of coordination compounds. He did simple experimental techniques to study the physical and chemical structure of coordination compounds. Concept of a primary valence and a secondary valence for a metal ion was also proposed by Werner . Binary compounds such as CrCl3, CoCl2 or PdCl2 have primary valence of 3, 2 and 2 respectively. In a series of compounds of cobalt(III) chloride with ammonia, it was found that some of the chloride ions could be precipitated as AgCl on adding excess silver nitrate solution in cold but some remained in solution