Important Terms Related to Coordination Compounds

The coordination number of a central metal atom in the complex is determined by

A homoleptic chemical compound is a metal compound with all the ligands _____ .

Oxidation number of $\mathrm{Fe}$ in ${\mathrm{K}}_3\left[\mathrm{Fe}\right(\mathrm{CN}{)}_6]$ is :

${\left[\mathrm{M}{\left({\mathrm{H}}_2\mathrm{O}\right)}_4\right]}^{+2}+4{\mathrm{CH}}_3{\mathrm{NH}}_2\stackrel{{\mathrm{K}}_1}{\to }\mathrm{A}; ∆{\mathrm{G}}_1^0$

${\left[\mathrm{M}{\left({\mathrm{H}}_2\mathrm{O}\right)}_4\right]}^{+2}+2{\mathrm{H}}_2{\mathrm{NCH}}_2{\mathrm{CH}}_2{\mathrm{NH}}_2\stackrel{{\mathrm{K}}_2}{\to }\mathrm{B}; ∆{\mathrm{G}}_2^0$

In the above reaction

(a) $∆{\mathrm{G}}_2^0$ is more negative than $∆{\mathrm{G}}_1^0$.

(b) Complex $\mathrm{A}$ is optically inactive.

(c) Entropy change is higher for the reaction of formation of complex $\mathrm{B}$.

(d) Formation constant ${\mathrm{K}}_2$ is greater than formation constant ${\mathrm{K}}_1$.

Choose the correct option.

Ammonia forms the complex ${\left[\mathrm{Cu}{\left({\mathrm{NH}}_3\right)}_4\right]}^{2+}$ with copper ions in alkaline solutions, but not in acidic solutions. Why?

Which of the following complexes is the most stable?

The ligand diethylenetriamine is _______.

Bidentate ligands are Lewis acids that accept two pairs of electrons to a metal atom.

A coordination entity constitutes a central metal atom or ion bonded to a fixed number of ions or molecules.

A bidentate ligand is:

A coordination entity constitutes a central metal atom or ion bonded to a fixed number of ions or molecules.

The coordination number of a metal ion in a complex can be defined as the number of ligand donor atoms to which the metal is directly bonded.

Ligand is an atom, an ion or molecule which is capable of accepting a pair of electrons from the central metal atom.

The formula of the complex sodium tetracarbonylcobaltate $\left(\mathrm{I}\right)$ is _____.

(A) $\mathrm{Na}\left[\mathrm{Co}{\left(\mathrm{CO}\right)}_4\right]$

(B) ${\mathrm{Na}}_3\left[\mathrm{Co}{\left(\mathrm{CO}\right)}_4\right]$

(C) ${\mathrm{Na}}_2\left[\mathrm{Co}{\left(\mathrm{CO}\right)}_4\right]$

Enter the correct answer as A, B or C.

Hydrazine $({\mathrm{NH}}_2-{\mathrm{NH}}_2)$ serves as :

Which of the following are bidentate monoanion ligands ?

(1) Acetylacetonato

(2) Oxalato ion

(3) Dimethylglyoximato

Select the correct answer using the codes given below : 

One mole of complex compound $\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5{\mathrm{Cl}}_3$ give $3$ moles of ions on dissolution in water. One mole of the same complex reacts with two moles of ${\mathrm{AgNO}}_3$ solution to yield two moles of $\mathrm{AgCl}\left(\mathrm{s}\right)$. The structure of the complex is 

Complex compounds are molecular compounds which retain their identities even when dissolved in water. They do not give all the simple ions in solution but instead furnish complex ions. The complex compounds are often called co-ordination compounds because certain groups called ligands are attached to the central metal ion by co-ordinate or dative bonds. Co-ordination compounds exhibit isomerism, both structural and stereoisomerism. The structure, magnetic property, colour and electrical properties of complexes are explained by various theories.

The oxidation number, co-ordination number and magnetic moment in the following complex is :
[Cr(C₂O₄)₂(NH₃)₂] ^- 

The three-dimensional spacial arrangement of ligand atoms/ions that are directly attached to the central atom is known as the _____.