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

Write IUPAC names of the following coordination compounds:
(i) \( [Ag(NH_3)_2][Ag(CN)_2] \)
(ii) \( K_3[Fe(C_2O_4)_3] \)

\( [NiCl_4]^{2-} \) is paramagnetic while \( [Ni(CO)_4] \) is diamagnetic though both are tetrahedral. Why? [At. No. Ni=28]

Using CFT, write electronic configuration for: (i) \( [CoF_6]^{3-} \) (ii) \( [Co(NH_3)_6]^{3+} \). [At. No. Co=27]

The Valence Bond Theory (VBT) explains the formation, magnetic behaviour and geometry of coordination compounds. The Crystal Field Theory (CFT) of coordination compounds is based on the effect of different crystal fields (provided by the ligands taken as point charges), on the degeneracy of d-orbital energies of the central metal atom/ion. The splitting of the d-orbitals provides different electronic arrangements in strong and weak crystal fields. Answer the following questione

29(a). In octahedral crystal field, energies of which d-orbitals will be raised when ligands approach? Give reason.

(i) Give a chemical test to show that \( [Co(NH_3)_5SO_4]Cl \) and \( [Co(NH_3)_5Cl]SO_4 \) are ionisation isomers.
(ii) What is meant by the 'Chelate effect'? Give an example.

The secondary valency of Pt in \( [Pt(en)_2Cl_2]^{2+} \) is

Indicate the type of isomerism exhibited by the following complex: $[Co(en)_3]Cl_3$

Define coordination number.

Why is \([Ni(H_2O)_6]^{2+}\) coloured? (Atomic number of Ni = 28)

Write the oxidation state and hybridisation of the central metal in the following complex: \[ [Fe(H_2O)_6]^{3+} \quad (\text{Atomic number of Fe = 26}) \]

A coordination compound CrCl\(_3 \cdot 6H_2O\) is mixed with excess AgNO\(_3\) solution, two moles of AgCl are precipitated per mole of the compound. Write the structural formula of the coordination compound.

Which type of isomerism is exhibited by the following complex? \[ [Pt(NH_3)_2Cl_2] \]

Differentiate between homoleptic complex and heteroleptic complex.

Write the IUPAC name of the following complex: \[ K_3[Cr(C_2O_4)_3] \]

Calculate the potential for half-cell containing 0.01 M K\(_2\)Cr\(_2\)O\(_7\)(aq), 0.01 M Cr\(^{3+}\)(aq), and 1.0 x 10\(^{-4}\) M H\(^+\)(aq).

The magnetic moment is associated with its spin angular momentum and orbital angular momentum. Spin only magnetic moment value of Cr$^{3+}$ ion (Atomic no. : Cr = 24) is:

The correct IUPAC name of [Pt(NH$_3$)$_2$Cl$_2$]$^{2+} $ is:

Assertion (A): [Cr(H$_2$O)$_6$]Cl$_2$ and [Fe(H$_2$O)$_6$]Cl$_2$ are examples of homoleptic complexes.
Reason (R): All the ligands attached to the metal are the same.

The number of moles of AgCl precipitated when excess AgNO$_3$ solution is mixed with one mole of [Co(NH$_3$)$_6$]Cl$_3$ is:

Out of Ti³⁺, Cr³⁺, Fe²⁺ and Ni²⁺ ions, the one which is the most stable ion in aqueous solution is: