List of top Chemistry Questions on Coordination chemistry asked in CBSE CLASS XII

The correct IUPAC name of the complex [Pt(NH$_3$)$_2$Cl$_2$] is:
Which of the following is heteroleptic complex?

Name the type of isomerism exhibited by the following compounds. Also, draw their corresponding isomers.

(I) \( [\text{Co(NH}_3\text{)}_6][\text{Cr(CN)}_6] \)

(II) \( [\text{Co(en)}_3]^{3+} \)

(III) \( [\text{Co(NH}_3\text{)}_3(\text{NO}_2)_3] \)

Coordination number of Fe in \([Fe(C_2O_4)_3]^{3-}\) is :

Assertion (A): [Cr(H_2O)_6]Cl_2 and [Fe(H_2O)_6]Cl_2 are examples of homoleptic complexes. 
Reason (R): All the ligands attached to the metal are the same.

The complex ions \([Co(NH_3)_5(NO_2)]^{2+}\) and \([Co(NH_3)_5(ONO)]^{2+}\) are called
The primary and secondary valences of Co in [Co(en)₃]Cl₃ respectively are:
According to Werner’s theory of coordination compounds:
Out of Ti3+, Cr3+, Mn2+ and Ni2+ ions, the one which has the highest magnetic moment is:
Which of the following complexes show linkage isomerism?
Which of the following complex ions is not optically active?
Differentiate between weak field and strong field ligands. How does the strength of the ligand influence the spin of the complex?
Write IUPAC names of the following coordination compounds:
\([ \text{CoCl}_2(\text{en})_2]\text{SO}_4 \)
(ii) \( \text{K}_3[\text{Fe}(\text{C}_2\text{O}_4)_3] \)
(ii) Didentate ligand and Ambidentate ligand
Which of the following complexes shows geometrical isomerism?

Answer the following:
(i) What happens to the colour of the complex \([ \text{Ti(H}_2\text{O)}_6 ]^{3+}\) when heated gradually?
(ii) Write the electronic configuration for a \(d^5\) ion if \(\Delta_o < P\).
(iii) Write the hybridization and magnetic behaviour of the complex \([ \text{Ni(CO)}_4 ]\).
(Atomic number: Ni = 28)

Answer the following about the complexes \([ \text{FeF}_6]^{3-} \text{ and } [\text{Fe(CN)}_6]^{4-}\):
(i) Write the hybridization involved in each case.
(ii) Which of them is the outer orbital complex and which one is the inner orbital complex?
(iii) Compare their magnetic behaviour.
[Atomic number: Fe = 26]
Differentiate between:
(i) Double salt and Complex compound
(ii) Didentate ligand and Ambidentate ligand
Using Crystal Field theory, write the number of unpaired electrons in octahedral complexes of Fe3+ in the presence of:
(I) Strong field ligand
(II) Weak field ligand
Atomic number: Fe = 26
Give reasons:
(I) \([ \text{Ni(CO)}_4 ]\) is diamagnetic whereas \([ \text{NiCl}_4 ]^{2-}\) is paramagnetic. [Atomic number: Ni = 28]
(II) CO is a stronger complexing agent than NH\(_3\).
(III) The trans isomer of complex \([ \text{Co(en)}_2\text{Cl}_2 ]^{+}\) is optically inactive.

Why is a solution of \(\text{Ni(H}_2\text{O})_6^{2+}\) green while a solution of \(\text{Ni(CN)}_4^{2-}\) is colourless? (At. No. of Ni = 28) 

Co2+ is easily oxidized to Co3+ in the presence of a strong ligand (At. No. of Co = 27).

Low spin tetrahedral complexes are not known. 

The diamagnetic species is :
At. No. Co = 27, Fe =26, Ni= 28]
The following initial rate data were obtained for the reaction: \[ 2\text{NO (g)} + \text{Br}_2 \text{(g)} \rightarrow 2 \text{NOBr (g)} \] initial rate data were obtained for the reaction
What is crystal field splitting energy?