Chemistry NCERT Exemplar Solutions Class 12th Chapter Nine

$CuO+H_2\to Cu+H_{2}O$

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

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

Higher the E.N. difference between hydrogen and other atom then higher be the strength of intermolecular H-bond

Here, order of difference in E.N is

O - H > N – H > C - H

Hence, correct order of H bond strength is,

CH₄ < HCN < NH₃

Fluorine forms only one oxoacid which is hypofluorous acid HOF because it shows only – 1 oxidation state. Which is due to its the smallest size among halogens & the highest electronegativity.

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.