Ncert Solutions Chemistry Class 12th

This is a Short Answer Type Questions  as classified in NCERT Exemplar

Ans: Due to the presence of weak and strong field ligands in complexes, compounds with comparable geometry have distinct magnetic moments. The magnetic moment decreases when the CFSE increases, and vice versa.

Example: [Fe (CN)₆]^3-  - Fe³⁺ ,3d⁵, CN^-  (strong field ligand, pairs electron)

  [Fe (H2O)₆]^3-  - Fe³⁺ ,3d5, H₂O (weak field ligand, does not pair)

This is a Short Answer Type Questions  as classified in NCERT Exemplar

Ans: CFSE is higher when the complex contains strong field ligand. Thus, crystal field splitting energy increases in the order

[Cr (Cl)₆]³⁻< [Cr (NH₃)₆]³⁺< [Cr (CN)₆]^3−.

Because according to spectrochemical series the order of field strength is

Cl⁻3−

This is a Short Answer Type Questions  as classified in NCERT Exemplar

Ans: CN^-  is a strong ligand and [Fe (CN)₆]^3-  has one paired electron

 H₂O is a weak ligand and [Fe (H₂O)₆]³⁺  has five paired electrons.

This is a Short Answer Type Questions  as classified in NCERT Exemplar

Ans: The ligands can be grouped in ascending order of increasing field intensity according to spectrochemical series.

[CoF6]³⁻, Co³⁺ → (d₆)→ t⁴_2g e⁰_g

[FE (CN)₆]⁴⁻, Fe²⁺→ (d₆)→ t⁶_2g e²_g

  [Cu (NH₃)₆]²⁺, Cu²⁺→ (d₉)→ t⁶_2g e²_g

This is a Short Answer Type Questions  as classified in NCERT Exemplar

Ans: In a tetrahedral complex, the d-orbit splits too little compared to an octahedral complex. As a result, orbital energy alone are insufficient to couple. Low spin tetrahedral complexes do not form as a result.

This is a Short Answer Type Questions  as classified in NCERT Exemplar

Ans: Weak field ligands, Electronic configuration of  Co (III) is t⁴_2g e⁰_g, has 4 paired electrons and it is paramagnetic.

Strong field ligands, Electronic configuration of is Co (III) t⁶2_ge⁰_g.

This is a Short Answer Type Questions  as classified in NCERT Exemplar

Ans: The existence of five unpaired electrons in the ion's mid-orbits Mn²⁺  equates to a magnetic moment of 5.92 BM. The number of hybridizations in this case is sp³. As a result, the magnetic moment value of the tetrahedral structure complex is 5.92 BM.

This is a Short Answer Type Questions  as classified in NCERT Exemplar

Ans: [M (AA)₂X₂]n +  is a bidentate ligand and %X is a monodentate ligand. It is an example of octahedral geometry as well as an ion. There are cis and trans isomers of this ion. Trans isomers are symmetrically active, while cis isomers are optically active.

This is a Short Answer Type Questions  as classified in NCERT Exemplar

Ans: The solution CrCl₃.4H₂O molar conductance shows that it contains one positive and one negative ion.

An ion is present outside the complex when silver chloride is treated with silver nitrate chloride. Outside the complex, there are two ions and one chloride, hence the name of the complex will be 

[Co (H₂O)4Cl₂]Cl, Tetraaquadichloridocobalt (III)chloride.