Crystal Field Theory (CFT)

A complex of metal ${\mathrm{M}}^{\mathrm{n}+}$ has the following electronic distribution in $\mathrm{d}$ orbitals,

The neutral M has a ground state electronic configuration of $\left[\mathrm{Ar}\right] 4{\mathrm{s}}^2 3{\mathrm{d}}^6.$ Which of the following complexes is consistent with the electronic distribution of ${\mathrm{M}}^{\mathrm{n}+}$ (as described above)?

In which of the following complexes, magnetic moment will change when all the ligands are replaced by ${\mathrm{CN}}^{-}$ ion to form a cyano complex?

In Wilkinson's catalyst, the hybridization of central metal ion and its shape are respectively:

 An octahedral complex $\text{'}\mathrm{X}\text{'}$ with magnetic moment $3.87 \mathrm{BM}$ may have:

(a) ${\mathrm{d}}^3$ configuration with weak field ligand.

(b) ${\mathrm{d}}^3$ configuration with strong field ligand.

(c) ${\mathrm{d}}^6$ configuration with strong field ligand.

(d) ${\mathrm{d}}^7$ configuration with weak field ligand.

Crystal field splitting energies for octahedral $\left({\mathrm{\Delta }}_0\right)$ and tetrahedral $\left({\mathrm{\Delta }}_{\mathrm{t}}\right)$ geometries caused by the same ligands are related through the expression

The order of octahedral crystal field energy for $\text{'}{\mathrm{e}}_{\mathrm{g}}\text{'}$ orbitals are

According to crystal field theory, total number of unpaired electrons present in the following molecules ${\left[{\mathrm{NiCl}}_4\right]}^{2-}, {\left[\mathrm{Ni}(\mathrm{CN}{)}_4\right]}^{2-}$ and ${\left[\mathrm{Ni}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$ will be

An octahedral complex having ${\mathrm{t}}_{2\mathrm{g}}^6 {\mathrm{e}}_{\mathrm{g}}^0$ configuration then correct for this complex is :

If the crystal filed splitting energy for octahedral complexes is ${\mathrm{\Delta }}_0$ and for tetrahedral complexes is $\mathrm{\Delta t}$, the two are related as

The crystal field-splitting for ${\mathrm{Cr}}^{3+}$ ion in octahedral field changes for ${\mathrm{I}}^{\ominus }, {\mathrm{H}}_2\mathrm{O}, {\mathrm{NH}}_3, {\mathrm{CN}}^{\ominus }$ and the increasing order is :-

The degeneracy of $\mathrm{d}$-orbitals is lost under :

(A) Strong field ligand

(B) Weak field ligand

(C) mixed field ligand

(D) Chelated ligand field

Choose the correct code :

In square planar complex of ${\mathrm{Co}}^{2+}$ ion unpaired electrons are present in

Calculate crystal field stabilisation energy in ${\left[\mathrm{Co}(\mathrm{CN}{)}_6\right]}^{3-}$ :

The $\mathrm{CFSE}$ for ${\left[{\mathrm{CoCl}}_6\right]}^{4-}$ complex is $18000$ ${\mathrm{cm}}^{-1}$. The $\mathrm{\Delta }$ for ${\left[{\mathrm{CoCl}}_4\right]}^{2-}$ will be ____$\times {10}^3 {\mathrm{cm}}^{-1}$.

The electronic configuration of central atom of complex ${\left[{\mathrm{MnO}}_4\right]}^{2-}$ is

The $\mathrm{CFSE}$ of octahedral ${\left[{\mathrm{CoCl}}_6\right]}^{-4}$ is $20,000 {\mathrm{cm}}^{-1}$. The $\mathrm{CFSE}$ for tetrahedral ${\left[{\mathrm{CoCl}}_4\right]}^{-2}$ will be :-

Predict the number of unpaired electrons in a square planar $d^8$ ion.

Which of following shows maximum $\mathrm{C}.\mathrm{F}.\mathrm{S}.\mathrm{E}.$ value ?

Which order is correct in spectrochemical series of ligand ?