The addition compounds in which some of the constituent ions (or) molecules lose their identity and when dissolved in water they do not break up completely into individual ions are called coordination compounds. The properties of the solutions of coordination compounds are different from those of their constituents. JEE gives high weightage to this topic, particularly the nomenclature of these compounds. A coordination compound is a high scoring topic in chemistry. The questions asked in this area are simple and direct. As the questions are less time taking, the significance rises. Questions asked in JEE generally follow a pattern and hence going through important topics at the last moment always helps.
Question 1: What are the important topics in coordination compounds that need to be focused in order to crack JEE?
Answer: According to JEE syllabus the significant topics in coordination compounds are:
- Nomenclature of coordination compounds
- Isomerism in coordination compounds
- Bonding in co-ordination compounds
- Double salts
- Werner’s co-ordination theory
- Crystal Field Theory
- Magnetic properties of coordination compounds
Question 2: What are the type of questions that are generally asked in JEE?
Q. Write down the IUPAC name of the complex K4[Fe(CN)6].
Solution: Firstly the +ve part should be named followed by the negative part in which the name of the ligands should be given in alphabetical order with the metal in the negative part ending in – ate (oxidation state in parenthesis). Thus the name is Potassiumhexacyano-C-ferrate(II). Hyphen C is shown to indicate CN– is bonded via carbon atom.
Q. Identify the paramagnetic and diamagnetic compounds amongst the following:
Ni(CO)4, [Ni(CN)4]2– and NiCl42-.
Solution: In Ni(CO)4, Ni has 3d10 configuration, hence it is diamagnetic.
In [Ni(CN)4]2–, Ni has 3d8 configuration but due to strong ligand field, all the d-electrons are spin paired giving dsp² hybridization, therefore it is also diamagnetic.
In [NiCl4]2–, Ni has 3d8 configuration and there are two unpaired electrons (weak chloride ligand do not pair up d-electrons) hence it is paramagnetic.
Question 3: Which books should be referred for coordination compounds while preparing for JEE?
Answer: Go through NCERT chemistry textbook part-I for class 12th, this book contains all the details in a very precise way. NCERT is the most student-friendly book as it covers all the topics that are significant from examination point of view. Inorganic Chemistry by J. D. Lee can be used as a reference book.
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