Question 1

What is the coordination number of cobalt in Co(en)33+?

Accepted Answer

The coordination number of a metal ion in a coordination compound is the number of ligand donor atoms directly bonded to the metal ion. In Co(en)33+, 'en' stands for ethylenediamine (ethane-1,2-diamine), which is a bidentate ligand. Since each 'en' molecule donates two donor atoms to the cobalt ion,

Question 2

Which of the following compounds exhibits linkage isomerism?

Accepted Answer

Linkage isomerism arises in coordination compounds containing ambidentate ligands. Ambidentate ligands are those ligands that have two different donor atoms and can coordinate through either of them. Among the given options, Co(NH3)5(NO2)Cl2 contains the nitrite ion (NO2-), which is an ambidentate l

Question 3

The IUPAC name of the coordination compound K3Fe(C2O4)3 is:

Accepted Answer

To name K3Fe(C2O4)3: 1. Name the cation first: Potassium. 2. Name the ligands alphabetically: tris(oxalato). 3. Name the central metal atom with its oxidation state in Roman numerals in brackets. Since the complex is an anion (Fe(C2O4)33-), the iron is named ferrate, and its oxidation state is +3 (c

Question 4

According to Werner's coordination theory, which of the following statements is true?

Accepted Answer

Werner's theory postulates that metal complexes have two types of valency: primary valency (ionisable, corresponding to oxidation state) and secondary valency (non-ionisable, corresponding to coordination number). Secondary valencies are directed towards fixed positions in space, giving a definite g

Question 5

What is the hybridization and magnetic nature of Ni(CN)42-?

Accepted Answer

In Ni(CN)42-, the oxidation state of Nickel is +2 (Ni2+, configuration 3d8). Cyanide (CN-) is a strong field ligand, which causes pairing of the 3d electrons. This leaves an empty d orbital, resulting in dsp2 hybridization for square planar geometry. Since all electrons are paired, it is diamagnetic

Coordination Compounds — CBSE Class 12 Chemistry Important Questions & Revision Notes