Optical isomerism is exhibited by among the following is/are:

1.	[Cr(Ox)3]3+	2.	[PtCl2(en)2]2+
3.	[Cr(NH3)2Cl2en]+	4.	All of the above

The incorrect statement(s) among the following option is/are-

1. In a coordination entity, the central atom or ion is surrounded by a suitable number of neutral molecules or negative ions ( called ligands). 

2. Coordination number is also referred as ligancy.

3. Coordination polyhedrons is the spatial arrangement of the ligands that are directly attached to the central metal ion in the coordination sphere.

4. None of these.

The correct statement(s) among the following options is/are :

1. Complexes in which the metal ion is bound to only one kind of a donor group are homoleptic complexes.

2. Heteroleptic complexes are those complexes where the central metal ion is bound to only one type of donor group.

3. $[\mathrm{Pt}{\left(\mathrm{Cl}\right)}_4{]}^{2-}$ is an example of a homoleptic complex.

4. Both (1) and (3) 

Ethylene diaminetetraacetate (EDTA) ion is:

Match Column I with Column II, Columns I and II represent complexes and magnetic moment (BM) respectively. 

Choose the correct answer from the options given below:

The incorrect statement(s) among the following options is/are:

The ligand(s)that show a chelating effect is/are:

The correct splitting diagram of d orbitals in an octahedral crystal field is:

1.		2.
3.		4.	None of these.

The correct representation of potassium tetracyanidonickelate(II) is :

$1. {\mathrm{K}}_3\left[\mathrm{Ni}{\left(\mathrm{CN}\right)}_4\right]$
$2. \mathrm{K}\left[\mathrm{Ni}{\left(\mathrm{CN}\right)}_4\right]$
$3. {\mathrm{K}}_2\left[\mathrm{Ni}{\left(\mathrm{CN}\right)}_4\right]$
$4. {\mathrm{K}}_2\left[\mathrm{Ni}{\left(\mathrm{CN}\right)}_5\right]$

The correct representation of pentaamminenitrito-O-cobalt(III) is :

$1. {\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5\left(\mathrm{ONO}\right)\right]}^{3+}$
$2. {\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5\left(\mathrm{ONO}\right)\right]}^{2+}$
$3. {\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5\left(\mathrm{ONO}\right)\right]}^{2-}$
$4. {\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5\left(\mathrm{ONO}\right)\right]}^{3-}$