12th Standard Chemistry Chapter 5 Coordination Chemistry Book Back Questions | QB365

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12th Standard Chemistry Chapter 5 Coordination Chemistry Book Back Questions

Published on: 03/09/2019

Coordination Chemistry

Download Tamil Nadu 12th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.

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Questions:

Generic 2

7 x 2 = 14

Write the oxidation state, coordination number , nature of ligand, magnetic property and electronic configuration in octahedral crystal field for the complex K₄[Mn(CN)₆]

What is the coordination entity formed when excess of liquid ammonia is added to an aqueous solution of copper sulphate?

Why tetrahedral complexes do not exhibit geometrical isomerism.

What is linkage isomerism? Explain with an example.

Give an example of coordination compound used in medicine and two examples of biologically important coordination compounds.

Write the formula for the co-ordination compounds.

Write the IUPAC names for the following complexes.

Generic 5

1 x 5 = 5

Give the difference between double salts and coordination compounds.

Multiple Choice Question

5 x 1 = 5

How many geometrical isomers are possible for [Pt(Py)(NH₃)(Br)(Cl)]?

(a)

(b)

(c)

(d)

10.

Which type of isomerism is exhibited by [Pt(NH₃)₂Cl₂]?

(a)

Coordination isomerism

(b)

Linkage isomerism

(c)

Optical isomerism

(d)

Geometrical isomerism

11.

Crystal field stabilization energy for high spin d⁵ octahedral complex is _______.

(a)

-0.6\({ \Delta }_{ 0 }\)

(b)

(c)

2(P-\({ \Delta }_{ 0 }\))

(d)

2(P+\({ \Delta }_{ 0 }\))

12.

IUPAC name of the complex K₃[Al(C₂O₄)₃] is _______.

(a)

potassium trioxalatoaluminium (III)

(b)

possium trioxalatoaluminate (II)

(c)

potassium trisoxalatoaluminate (III)

(d)

potassium trioxalatoaluminate (III)

13.

The sum of primary valence and secondary valence of the metal M in the complex [M(en)₂(Ox)]Cl is________.

(a)

(b)

(c)

-3

(d)

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Answers Key:

Generic 2

7 x 2 = 14

(i) Oxidation state of the central metal ion : +2 (i.e) Mn²⁺
(ii) Co-ordination number : 6
(iii) Nature of ligand: CN^-(Negative ligand)
(iv) Magnetic property: Paramagnetic nature
(v) Electronic configuration:

(vi) Oxidation state: +2 (or) Mn²⁺ of central metal ion

(i) When excess of liquid ammonia is added to an aqueous solution of copper sulphate gives tetra ammine copper (II) sulphate is formed.
CUso₄ + 4NH₃ \(\rightarrow\) [Cu(NH₃)₄]SO₄
(ii) The co-ordination entity is [Cu(NH₃)₄]²⁺

Tetrahedral complexes do not exhibit geometrical isomerism. Because the relative position of donor atoms of ligand the unidentate Iigands (donor atom) attached to the central atom are same with respect to each other.

(i) This is also called as salt isomerism.
(ii) This type of isomers arises when an ambidentate ligand is bonded to the central metal atom/ion through either of its two different donor atoms. In the below mentioned examples, the nitrite ion is bound to the central metal ion Co³⁺ through a nitrogen atom in one complex and through oxygen atom in other complex.
\(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5}\left(\mathrm{NO}_{2}\right)\right]^{2+}\)

Medicinal uses
(i) Ca-EDTA chelate, is used in the treatment of lead and radioactive poisoning.
(ii) That is for removing lead and radioactive metal ions from the body.
(iii) Cis-platin is used as an antitumor drug in cancer treatment.
Biological Importance compounds:-
(i) Fe²⁺ - porphyrin complex: It plays an important role in carrying oxygen from lungs to tissues and tissue carbon dioxide from to lungs.
(ii) Chlorophyll - useful in photosynthesis in plants.

a) potassiumhexacyanidoferrate(II) - Potassiumhexacyanidoferrate(II) - K₄[Fe(CN)₆]
b) Pentacarbonyliron(0) - [Fe(CO)₅]
c) Pentaamminenitrito −kNcobalt(III)ion - [Co(NH₃)₅(NO₂)]²⁺
d) Hexaamminecobalt(III) Sulphate - [CO(NH₃)₆](SO₄)₃
e) Sodiumtetrafluoridodihydroxidochromate(III) - Na₂[CrF₄(OH)₂]

i) Na₂[Ni(EDTA)] - Sodium 2, 2', 2",2'" - (ethane-1,2 diyldinitrilo tetraacetatonickelate)(II)
ii) [Ag(CN)₂]^- - Dicyanido-kC-argentate (I) ion
iii) [CO(en)₃]₂(SO₄)₃ - Tris (ethane 1, 2 diamine)cobalt (III) sulphate
iv) [CO(ONO)(NH₃)₅]²⁺ - Pentaamminenitrito - KO cobalt (III) ion
v) [Pt(NH₃)₂Cl(NO₂)] - Diammainechloridonitro - kN - platinum (II)

Generic 5

1 x 5 = 5

S. No	Double salts	Co-ordination compound
1.	They usually contain two simple salt in equimolar proportions	The simple salts from which they are formed may or may not be in equimolar proportion.
2.	They exists only in the solid state. In aqueous solution they dissociate completely into ions.	They exist in the solid state as well as in aqueous solution. This is because even in solution, the complex ion does not dissociate into ions.
3.	They are ionic compounds and do not contain any co-ordinate bond.	They may or may not be ion but the complex part always contain coordinate bonds
4.	The properties of the double salts are same as those of its constituent compounds.	The properties of the coordination compounds are different for its constituent bonds.
5.	In a double salt, the metal ion show their normal valency.	In a coordinate compound the metal ion satisfies its two types of valence called primary & secondary valenices.
6.	A double salt loses its identity and dissociates into its constitute simple ions in solution.	The complex ion does not lose its identity and never dissociate to give simple ions.
	Example: FeSO₄ (NH₄)₂ SO₄.6H₂O	Example: K₄[Fe(CN)₆), K₃[Fe(SCN)₆)

Multiple Choice Question

5 x 1 = 5

Three isomers. If we consider any one of the ligands as reference (say Py), the arrangement of other three ligands (NH₃, Br^- and Cl^-) with respect to (Py) gives three geometrical isomers.

10.

11.

The electronic configuration t_2g³, e²_g
[ 3 x (-0.4)+ 2(0.6)]Δ₀
[-1.2 + 1.2] Δ₀ = 0

12.

(d)
potassium trioxalatoaluminate (III)

13.

In the complex [M(en)₂(Ox)]Cl For the central metal ion M3+
The primary valence is = +3
The secondary valence = 6
sum of primary valence and secondary valence = 3 + 6 = 9