Chemistry NCERT Exemplar Solutions Class 12th Chapter Nine

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Correct option: D

Two or more compounds with the same formula but distinct structures and characteristics are known as isomers.

So, in this case compounds 

[Co (SO₄) (NH₃)₅]Br and  [Co (SO₄) (NH₃)₅]Cl show no isomerism

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Correct option: (A)

Linkage isomerism arises in a coordination compound containing ambidentate ligand.

A simple example is by complexes containing the thiocyanate ligand, NCS-which may bind through the nitrogen to give M-NCS or through sulphur to give M-SCN.

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Correct option: A

CFSE for octahedral and tetrahedral complex is related as

Δt = $\frac{4}{9}$ Δ₀

Where Δ₀= CFSE for octahedral complex

Δ₀= CFSE for tetrahedral complex

Δ₀=1800 cm⁻¹

Δt =49*18000=8000 cm⁻¹

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Correct option: A

This is due to the complex's octahedral structure and (cis-trans) isomerism. Two Cl ligands are next to each other in trans isomerism. Although these isomers have the same structure, they are not identical.

Possible isomers are:

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Correct option: C

The chelate effect is when a chelating ligand coordinates the stabilisation of a molecule. Any ligand that binds to metal forms a ring with 5 or 6 members, which is the most stable.

Here, CO, CN, H₂O is monodentate ligand [Fe (C₂O₄)₃]^3-  is an oxalate ligand. 

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Correct option:  A

Diamminedichloridoplatinum (II) is also known as azane 

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Correct option: D

When 1 mol [CrCl₃ (H₂O)₃]6H₂O is treated with excess of AgNO₃, 3 mol of AgCl is produced, i.e., [CrCl₃ (H₂O)₃]6H₂Ois dissociated in aqueous solution and all three chloride comes in solution.

[Cr (H₂O)₆]Cl₃→ [Cr (H₂O)₆]³⁺  + 3Cl^- 

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Correct option: B

When 0.1 mol CoCl₃ (NH₃)₅ is treated with excess of AgNO₃, In the given reaction [CoCl3 (NH₃)₅]Cl₂

then electrolytic solution must contain 

[CoCl₃ (NH₃)₅]Cl²⁺  and two Cl^-  ions. 

Hence, it is 1:2 electrolyte.

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Correct option: A

Strong field ligands have five degenerate energy levels, which means they have more energy separation than weak field ligands.

Here, ΔE= $\frac{\mathrm{h}\mathrm{c}}{\mathrm{\lambda }}$

ΔE α $\frac{1}{\mathrm{\lambda }}$

$\mathrm{\lambda }$ α $\frac{1}{\mathrm{\Delta }\mathrm{E}}$

The wavelength decreases as the energy separation rises.

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Correct options: B

The bigger the value of constant, the better will be the stability.

Here, has the highest value of logk which corresponds to the highest value of k.