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

For the coordination compound on the basis of crystal field theory, write the electronic configuration for d\(^4\) ion if \(\Delta_o\) < P. Is the coordination compound a high spin or low spin complex?
What type of isomerism is shown by the complex [Co(NH\(_3\))\(_6\)][Cr(CN)\(_6\)]?
Write the geometry and magnetic behaviour of the complex [Ni(CO)\(_4\)] on the basis of Valency Bond Theory (VBT).
Write the IUPAC name of the following complex: [PtCl\(_2\)(en)\(_2\)](NO\(_3\))\(_2\)
How is the crystal field splitting energy for octahedral complex (\(\Delta_o\)) related to that of tetrahedral complex (\(\Delta_t\))?
Write the electronic configuration of \(d^5\) in terms of \( t_{2g} \) and \( e_g \) in an octahedral field as: 
\( \Delta_o>P \)
 
What is the difference between an ambidentate ligand and a bidentate ligand?
Out of \([CoF_6]^{3-}\) and \([Co(C_2O_4)_3]^{3-}\), which complex is:} 
(i) More stable? 
(ii) The high-spin complex? 
 
Write the hybridization and magnetic character of the complex \([Ni(CO)_4]\) on the basis of valence bond theory.
[Atomic No. Ni = 28]
Arrange the following complex ions in increasing order of their crystal field splitting energy (\( \Delta_0 \)):
\(\text{[Co(NH}_3\text{)}_6]^{3+}, \, \text{[CoF}_6]^{3-}, \, \text{[Co(CN)}_6]^{3-}\)
Write the IUPAC name of the complex:
\(\text{[Co(H}_2\text{O})(\text{CN})(\text{en}_2)^{2+}]\)
Which type of isomerism is shown by the complexes \([Co(NH_3)_5Br]SO_4\) and \([Co(NH_3)_5SO_4]Br\) ?
Using valence bond theory, predict: (a) Hybridisation of central metal atom of the complex \([Co(NH_3)_6]^{3+}\)
(b) Its shape and magnetic behaviour
(c) Whether it is a high spin or a low spin complex
[Atomic number: $CO$ = 27]
Write IUPAC name of the given complex: \( K_3[Cr(C_2O_4)_3] \)
Oxidation state of central metal atom in the given complex is: \[ [Co(NH_3)_4(H_2O)_2]Cl_3 \]

How many ions are produced from the complex \(Co(NH_3)_6Cl_2\) in solution? 
 

Amongst the following, the most stable complex is
The oxidation number of cobalt in \(K[Co(CO)_4]\) is

What is the coordination entity formed when excess of aqueous \(KCN\) is added to an aqueous solution of copper sulphate? Why is it that no precipitate of copper sulphide is obtained when \(H_2S(g)\) is passed through this solution?

Discuss briefly giving an example in each case the role of coordination compounds in:

  1. biological systems
  2. medicinal chemistry
  3. analytical chemistry
  4. extraction/ metallurgy of metals

Draw the structures of optical isomers of: 
(i) \([Cr(C_2O_4)_3]^{3–}\)
(ii) \([PtCl_2(en)_2]^{2+}\)
(iii) \([Cr(NH_3)2Cl_2(en)]^{+}\)

Draw all the isomers (geometrical and optical) of: 
(i) \([CoCl_2(en)_2]^{+}\) 
(ii)\( [Co(NH_3)Cl(en)_2] ^{2+} \)
(iii)\( [Co(NH_3)_2Cl_2(en)]^{+}\)

List various types of isomerism possible for coordination compounds, giving an example of each
Discuss the nature of bonding in metal carbonyls

What is spectrochemical series? Explain the difference between a weak field ligand and a strong field ligand.