NIOS Class 12 Chemistry Chapter 22 Coordination Compounds

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NIOS Class 12 Chemistry Chapter 22 Coordination Compounds

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Coordination Compounds

Chapter: 22

Module – VI: Chemistry of Elements

INTEXT QUESTIONS 22.1

1. Explain primary valence.

Ans: Primary valence corresponds to the oxidation state of the central metal ion.

It is satisfied by negative ions only.

2. Explain secondary valence.

Ans: Secondary valence of the metal corresponds to coordination number and is satisfied by negative ions or neutral molecules.

3. What is the number of the secondary valence in the following: [Cr(H₂O)₆] Cl₃ and [Co(NH₃)₅Cl]Cl₂ ?

Ans: In both secondary valance is 6.

4. What is shape associated with a six-coordinated complex?

Ans: Octahedral.

5. How many types of shapes are possible for four-coordinate complexes?

Ans: Two i.e. Tetrahedral or square planar.

INTEXT QUESTIONS 22.2

1. What is the coordination number of the metal ion in the following?

(i) [Co(NH₃)₅Cl]⁺

(ii) [Cr(en)₂Cl₂]⁺

(iii) [NiCl₄]²⁻

Ans: (i) 6

(ii) 6

(iii) 4

2. What is the oxidation state of the metal ion in the following?

(i) [MnCl₆]⁴⁻

(ii) [Fe(CN)₆]³⁻

(iii) [Cr(NH₃)₆]³⁺

(iv) [Ni(en)₃]²⁺

Ans: (i) +2

(ii) +3

(iii) +3

(iv) +2

3. Give an example of a chelate ligand.

Ans: EDTA.

4. Give one example of each monodentate, bidentate and polydenatate ligand.

Ans: NH₃, ethylenediammine and EDTA.

5. What is the oxidation and coordination number of Co in this [Co(en)₂(H₂O)CN]²⁺ complex ion Which ligand is bidentate in the above complex? 

Ans: +3, 6, Ethylenediammine.

INTEXT QUESTIONS 22.3

1. Write down the name of the following complexes:

(a) [Co(NH₃)₄Cl₂]⁺

(b) (NH₄)₃[Cr(NCS)₆]

(c) Ni(CO)₄

(d) K₄[Fe(CN)₆]

(e) [Cr(en)₃]Cl₃

Ans: (i) Tetraamminedichlorocobalt (III) ion.

(ii) Ammonium-hexaisothiocyanatochromae (III).

(iii) Tetracarbonylnickel (0).

(iv) Potassium-hexacyanoferrate (II).

(v) Tris(ethylenediamine) chromium (III) chloride.

2. Write down the formula of the following:

(a) Tetrachloronickelate(II).

(b) Pentaamminenitrocobalt(III) ion.

(c) Potassium hexacyanoferrate(III).

(d) Dichlorobis(ethylenediammine) chromium(III) ion.

Ans: (i) [NiCl₄]²⁻

(ii) [Co(NH₃)₅NO₂]²⁺

(iii) K₃[Fe(CN)₆]⁻

(iv) [Cr(en)₂Cl₂]⁺.

INTEXT QUESTIONS 22.4

1. Name the type of hybridization present in: [Co(NH₃)₆]³⁺.

Ans: d²sp³.

2. [Fe(CN)₆]³⁻ is diamagnetic or paramagnetic?

Ans: [Fe(CN)₆]³⁻ is paramagnetic because it has one unpaired electron.

3. [NiCl₄]²⁻ and Ni(CO)₄ have sp³ or dsp² hybridization?

Ans: Both the complexes have sp³ (tetrahedral) hybridization.

4. Which one is diamagnetic: [Ni(CN)₄]²⁻ or [NiCl₄]²⁻?

Ans: [Ni(CN)₄]²⁻ is diamagnetic because it is square planar (dsp² hybridization). It has no unpaired electron.

5. What type of hybridization is shown by (i) inner and (ii) outer orbital complexes?

Ans: Inner – d²sp³, outer – sp³d².

6. [FeF₆]⁴ is paramagnetic but [Fe(CN)₆]⁴⁻ is diamagnetic. explain by CFT.

Ans: F– is weak field ligand therefore electron will be filled t₂g⁴eg⁰² (i.e. four unpaired electron) therefore paramagnetic but CN– is strong field ligand so electronic configuration will be t₂g⁶eg⁰ (no unpaired electron).

7. Which is strong field ligand F^– or CN^–.

Ans: F^– weak field CN^– strong field ligand.

INTEXT QUESTIONS 22.5

1. Name two elements which are extracted by complexation.

Ans: Gold and silver are extracted by cyanide process.

2. What is the use of EDTA in medicine?

Ans: EDTA forms soluble complex with elements. It is used in the treatment of lead poisoning.

3. Name the compound of platinum which is used as anticancer agent?

Ans: Cis-platin.

4. Give two uses of complexes in qualitative analyses?

Ans: [Cu(NH₃)₄]²⁺ & [Ni(DMG)₂].

5. Write down geometrical isomers of Pt(NH₃)Cl₂.

Ans: Pt(NH₃)₂Cl₂ (a square-planar Pt(II) complex) shows geometrical isomerism.

It has two geometrical isomers:

(i) cis-Pt(NH₃)₂Cl₂

• The two NH₃ ligands are adjacent to each other.
  
• The two Cl⁻ ligands are also adjacent.

(ii) trans-Pt(NH₃)₂Cl₂

• The two NH₃ ligands are opposite to each other.
  
• The two Cl⁻ ligands are opposite.

Thus, the geometrical isomers are cis and trans forms.

6. [Co(NH₃)₅SCN]²⁺ and [Co(NH₃)₅NCS)²⁺ is the example of…….

Ans: Linkage isomerism Fe²⁺ = 3d⁶.