Coordination Compounds

${\mathrm{C}\mathrm{r}}^{2+}$ and ${\mathrm{F}\mathrm{e}}^{2+}$ both have 4 unpaired electrons.

All metal carbonyls have synergic bonds.

 ${\left[Ni{\left(CN\right)}_4\right]}^{2-}$

CN is strong field ligand

$N{i}^{2+}=4s^{0}3d^8$

Here; ${\left[Ni{\left(CN\right)}_4\right]}^{2-}$ is square planar and diamagnetic.

$\left[Ni{\left(CO\right)}_4\right]$

Ni = 4s²3d⁸Co is strong field ligand.

Here ; $\left[Ni{\left(CO\right)}_4\right]$ is tetrahedral and diamagnetic

${\left[Ni{\left(CN\right)}_4\right]}^{2-}$ has 3d⁸ configuration while $\left[Ni{\left(CO\right)}_4\right]$ has 3d¹⁰ configuration.

In complex ${\left[Fe{\left(CN\right)}_6\right]}^{---}$

CN is the strong field ligand

$F{e}^{3+}\to 3d^5\left[t_{2g}^5{e}_g^0\right]$

CFSE value = 5 * $\left(-0.4{\Delta }_0\right)=-2.0{\Delta }_0$

Sol. (a) In extraction of iron lime stone is added on a flux

$\begin{array}{rr}& {\mathrm{C}\mathrm{a}\mathrm{C}\mathrm{O}}_3?\mathrm{C}\mathrm{a}\mathrm{O}+{\mathrm{C}\mathrm{O}}_2\\ & {\mathrm{C}\mathrm{O}}_2+{\mathrm{S}\mathrm{i}\mathrm{O}}_2?{\mathrm{C}\mathrm{a}\mathrm{S}\mathrm{i}\mathrm{O}}_3\end{array}$

This is a Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans: Correct option: D

[Fe (CN)₆]^3-  ion shows magnetic moment corresponding to one unpaired electron. (CN) is a ligand with a strong field that couples electrons, resulting in hybridisation. d²sp³ and it has one unpaired electron, it has the magnetic moment of one paired electron.

  μ= $\sqrt[]{n(n+2}$   = 1 (1 + 2)

   = 3 = 1.73BM 

This is a Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans: Correct option: B

From the Cis and Trans forms, geometrical isomerism forms compounds. All of the valences in the MX₆ ligand are the same, resulting in an identical molecule. L is a distinct ligand in MX₅L, and it can be replaced with any other valency in the structure to create an identical molecule; the molecule does not change. Because of the presence of symmetry, which is an essential prerequisite for revealing geometrical isomerism, complexes do not show geometrical isomerism.

This is a Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans: Correct option: A

The term "linkage isomerism" refers to two molecules that have similar ligands but differ in the donating site of the ligand. Ambidentate is made up of two different types of donor atoms.

Example [Fe (NO₂) (H₂O)₅]Cl₂. NO₂ is Ambidentate ligand as Nand O₂ are donors.

 As a result, linkage isomerism occurs in coordinations with ambidentate ligands. Reason and Assertion are both correct.

This is a Assertion and Reason Type Questions as classified in NCERT Exemplar

Ans: Correct option: B

[Cr (H₂O)₆]Cl₂ and [Fe (H₂O)₆]Cl₂ 

Due to the creation of a more stable complex ion after obtaining ion, [Cr (H₂O)₆]Cl₂ and [Fe (H₂O)₆]Cl₂ are reduced in nature. Both compounds have a coordination of 6 and so form an octahedral complex. The hybridisation state of is 3 and the oxidation state of is 2+. Hybridization is 3d⁴ and 3d⁶ is 2+. Both compounds have unpaired electrons and have weak field ligands. In both compounds, removing electrons is simple.