#### 12th Standard Chemistry English Medium Coordination Chemistry Reduced Syllabus Important Questions 2021

12th Standard

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 100

Multiple Choice Questions

15 x 1 = 15
1. A complex has a molecular formula MSOCl. 6HO42.The aqueous solution of it gives white precipitate with Barium chloride solution and no precipitate is obtained when it is treated with silver nitrate solution. If the secondary valence of the metal is six, which one of the following correctly represents the complex?

(a)

[M(H2O)4Cl]SO42H2O

(b)

[M(H2O)6]SO4

(c)

[M(H2O)5Cl]SO4H2O

(d)

[M(H2O)3Cl]SO4.3H2O

2. In which of the following coordination entities the magnitude of Δ0 will be maximum?

(a)

[Co(CN)6]3-

(b)

[Co(C2O4)]3-

(c)

[Co(H2O)6]3+

(d)

[Co(NH3)6]3+

3. Choose the correct statement

(a)

Square planar complexes are more stable than octahedral complexes

(b)

The spin only magnetic moment of [Cu(Cl)4]2- is BM and it has square planar structure.

(c)

Crystal field splitting energy $\left( { \Delta }_{ 0 } \right)$ [FeF6]4- is higher than the $(\Delta _{ 0 })$ $[Fe(CN)6]{ { 4 }^{ - } }$

(d)

crystal field stabilization energy of [V(H2O)6]2+ is higher than the crystal field stabilization of [Ti(H2O)6]2+

4. The total number of electrons donated by ligands to platinum ion in [Pt(en)2CI2] is

(a)

8

(b)

10

(c)

12

(d)

14

5. [Fe(H2O)6]3+ and [Fe(CN)6]3- differ in

(a)

magnetic nature

(b)

co-ordination number

(c)

oxidation number

(d)

Structure

6. In Co-ordination compound. [Cr(en)3][CrF6

(a)

ligand is en (ethylenediamine)

(b)

Oxidation state of central atom is +3

(c)

Central metal is Cr (in anomie comples)

(d)

Cation complex is [Co(NH3)4Cl2]+

7. Which among the following square planar complexes will exhibet geometrical isomerism?

(a)

[Ma2B2]

(b)

[MA2BC]

(c)

[M(xy)]

(d)

all the above

8. Coordination compounds are stabilised by Chelate effect. Which among the following is the most stable complex?

(a)

[Fe(CN)6]3-

(b)

[Fe(Co)5]

(c)

[Fe(NH3)6]3+

(d)

[Fe(C2O4)3]3-

9. A 'd' block metal ion has a magnetic moment of 1.732 BM. The number of unpaired electrons are

(a)

1

(b)

2

(c)

3

(d)

4

10. The isomerism exhibited by the complexes [Co(NH3)6] [Cr(CN)6] and [Cr(NH3)8] [CO(CN)6] is_________

(a)

Geometrical

(b)

Coordination

(c)

(d)

ionisation

11. Werner's theory was not able to explain______________ of coordination compounds

(a)

colour

(b)

magnetic properties

(c)

both (a) and (b)

(d)

neither (a) nor (b)

12. The ligand capable of coordinating in two or more ways with the central metal ion are called ___________ ligands.

(a)

didentate

(b)

tridentate

(c)

ambidentate

(d)

none of the above

13. According to crystal field theory, the bond between the ligand and central metal atom is_______________

(a)

Purely ionic

(b)

Purely covalent

(c)

Coordinate

(d)

50% ionic and 50% covalent

14. In co-ordination complexes, ligand ammonia is written as ___________

(a)

ammine

(b)

amine

(c)

ammonal

(d)

none of these

15. Primary valency corresponds to the ______________

(a)

oxidation state of the metal

(b)

co-ordination number

(c)

number of ligands

(d)

charge on the complex

16. 2 Marks

10 x 2 = 20
17. Write the IUPAC names for the following complexes
i) Na2[Ni(EDTA)]
II) [Ag(CN)2)
iii) [Co9en)3]2(SO4)3
iv)[Co(ONO)(NH3)5]2+
v)[Pt(NH3)2Cl(NO2)]

18. Write the formula for the following coordination compounds.
a) potassiumhexacyanidoferrate(II)
b) petacarbonyliron(0)
c) pentaamminenitrito −k−N-cobalt(III)ion
d) hexaamminecobalt(III)sulphate
e) sodiumtetrafluoridodihydroxidochromate(III)

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

20. Give the names of two complexes which are used in medicines.

21. Write the IUPAC name of [Cu(NH3)4]SO4

22. Name the type of isomerism that occurs in complexes in which both cation and anion are complex ions.

23. Define coordination number.

24. Name the following :
(i) Ring that is attached to Fe2+ in haemoglobin.
(ii) Vitamin B12 is a co-ordination compound of this element.
(iii) Complex that is used in the hydrogenation of alkenes

25. What is a central atom or ion?

26. What are ligands?

27. 3 Marks

10 x 3 = 30
28. Give an example for complex of the type [Ma2b2c2] where a, b, c are monodentate ligands and give the possible isomers.

29. Classify the following ligand based on the number of donor atoms
a)NH3
b)en
c)ox2-
d) triaminotriethylamine
e) pyridine

30. Give the difference between double salts and coordination compounds.

31. Write the postulates of Werner’s theory

32. Why tetrahedral complexes do not exhibit geometrical isomerism

33. How is magnitude of ${ \triangle }_{ 0 }$ affected by (i) nature of ligands (ii) oxidation state of metal ion.

34. Draw the structure of the following homoleptic metal carbonyl.
(i) [Ni(CO)4]
(ii) [Fe(CO)5]
(iii) [Cr(CO)6]

35. Match the common name with formula and the IUPAC ligand name.

Common name Formula IUPAC ligand name
Bromide C2O42- Carbonato
Nitrate Br- Oxalato
hydroxide NO3- hydroxido
Carbonate OH- bromido
Oxalate CO32- nitrato
36. What are the limitations of VBT?

37. Name some metal complexes, that are present in our biological system and their role in it.

38. 5 Marks

7 x 5 = 35
39. Explain optical isomerism in coordination compounds with an example.

40. 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]

41. Mention the type of hybridisation and magnetic property of the following complexes using VB theory a) [FeF6]4- b) [Fe(CN)6]4-

42. Give the postulates and limitation of Werner's theory of co-ordination compounds.

43. Indicate the types of isomerism exhibited by the following complexes and draw the structures for these isomers.
(i) K[Cr(H2O)2 (C2O4)2] (ii) [Co(en)3]CI3 (iii) [Co(NH3)5(NO2)](NO3)2
(iv) [Pt (NH3)(H2O)CI2]

44. How are metal carbonyls classified depending on the number of metal atoms?

45. Give the structure for the following compounds.
(i) pentaamminechlorocobalt (III) ion
(ii) Triamminetrinitrito- k N cobalt (III)
(ill) tetraammineaquabromidooobalt(III)nitrate
(iv) Dichloridobisethane-1 )2-diamine) cobalt (lIl) chloride
(v) Tetraamminecopper (lI)sulphate