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d-Block Elements & Co-ordination Compounds

Name: ______________________________________ Batch: Date:

Comprehension – (1)

A,B and C are three complexes of chromium (III) with the empirical formula Cr 12 6 3H O CI . All the three complexes have water and chloride ions as ligands. Complex A does not react with concentrated 2 4H SO , whereas complex B and C loss 6.75% and 13.5% of their original weight respectively, on treatment with concentrated 2 4H SO .

1. Complex A is : (A) ( )6 36

Cr H O CI⎡ ⎤⎣ ⎦ (B) ( )2 2 25Cr H O CI CI .H O⎡ ⎤⎣ ⎦

(C) ( )2 2 24Cr H O CI CI.2H O⎡ ⎤⎣ ⎦ (D) None of these

2. Loss in weight on treatment with concentrated 2 4H SO is due to:

(A) CI− is lost as HCI (B) 3Cr + is lost as ( )2 4 3Cr SO

(C) 2H O is lost due absorption (D) CI− is lost as 2CI

3. Which of the above complex is maximum hydrated? (A) A (B) B (C) C (D) equally

4. Select the correct statement :

(A) Conductance in these complex is in order C < B < A (B) EAN of chromium is identical in each complex (C) Non – reactivity of A with conc. 2 4H SO is due to absence of water molecules outside

co-ordinated sphere (D) All of the above are correct

Comprehension – (2) The atoms or ions with available energy orbital’s can attract loosely bonded pair of electrons form other molecules. A higher amount of positive charge on the side atom or ion makes its orbaitals every more attractive for the loosely bonded electron pairs. The molecules with loosely bonded pairs also have different polarizabilities. The higher size of surrounding molecules and lower size of atom offering low energy increases crowding and diminishes the tendency of bonding.

5. Which is most stable? (A) [ ]24NiCI − (B) ( )

2

4Ni CN

−⎡ ⎤⎣ ⎦ (C) ( )

2

4Pd CN

−⎡ ⎤⎣ ⎦ (D) ( )

2

4Pt CN

−⎡ ⎤⎣ ⎦

6. Which is strongest donor? (A)CI− (B) OH− (C) 3NH (D) CN−

Comprehension – (3) A metal complex having composition Cr ( )3 24

NH CI Br has been isolated in two forms (X) and (Y). the form (X)

reacts with 3AgNO to give a white precipitate readily soluble in dilute aqueous ammonia, where as (Y) gives a pale yellow precipitate soluble in concentrated ammonia.

7. Choose the statement regarding compound X and Y: (A) Both compounds X and Y have different magnetic moment (spin only) (B) Both complexes X and Y have same magnetic moment (spin only) (C) Magnetic moment of both X and Y is calculated by assuming they are low spin complex (D) Both compound X and Y have different primary valence.

8. The hybridization of compound ‘X’ and ‘Y’ is respectively: (A) 3 2 2sp ,d sp (B) 3 2 3 2sp d ,sp d (C) 2 3 2 3d sp .d sp (D) 2 3 3 2d sp ,sp d

9. Choose the correct statement regarding the complex X and Y: (A) Both complexes have same six geometrical isomer (B) Both complexes have exactly same conductivity in 2H O (C) In both the complexes 3NH is involved only to secondary valiancy

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(D) In both the complexes electronic configuration of 2gt is same (a) I, II and III (b) I,II, III and IV (c) II , III, and IV (D) I, III, and IV

Comprehension – (4) Square planar complexes are formed by 8d ions with strong field ligands. The crystal field splitting Δo is larger for second and third row transition elements and for more highly charged species. All the complexes having

84d and 85d configurations are mostly square planer including those with weak field ligands such as halide ions. Square planer complexes can show geometrical isomerism but they do not show optical isomerism due to the presence of plane of symmetry.

10. Which of the following complex is low spin? (A) ( )

2

3 6Ni NH

+⎡ ⎤⎣ ⎦ (B) ( )4Ni CO⎡ ⎤⎣ ⎦

(C) ( )2

3 4Pt NH

+⎡ ⎤⎣ ⎦ (D) all are low spin complex

11. Amongst the following complex is low spin ? (A) ( )( )3 2

RhCI CO PPh⎡ ⎤⎣ ⎦ (B) ( )3 4K Cu CN⎡ ⎤⎣ ⎦

(C) ( )2 4K Zn CN⎡ ⎤⎣ ⎦ (D) ( )4Ni CO⎡ ⎤⎣ ⎦

12. Which of the following molecule has synergic bonding? (A) ( )

3

3Fe Phen

+⎡ ⎤⎣ ⎦ (B) ( )5 5 2

Fe C H⎡ ⎤π −⎣ ⎦

(C) ( )3 3RhCI PPh⎡ ⎤⎣ ⎦ (D) all are having synergic bonding

Comprehension – (5) Valence bond theory describes the bonding in complex in terms of co-ordinate – covalent bonds resulting from overlap of filled ligand orbitals with vacant metal hybrid orbitals. This theory explains magnetic behavior and geometrical shape of co-ordination compounds. Magnetic moment of a complex compound can be determined experimentally and theoretically by using spin only formula. Magnetic moment = ( )n n 2+ B.M. (where n = No of unpaired electrons).

13. The value of spin only magnetic moment for octahedral complex of the following configuration is 2.84 B.M. The correct statement is : (A) 4d (in weak field ligand) (B) 2d (in weak field and in strong field ligand) (C) 3d (in weak field and in strong field ligand) (D) 5d (in strong field ligand)

Comprehension – (6) 14. 2Ni + cation combines with a uninegative monodentate ligand X− to form paramagnetic complex [ ] 24NiCI − The

number of unpaired electron (s) in central metal cation and geometry of this complex respectively are: (A) One, tetrahedral (B) Two, tetrahedral (C) One, square planer (D) Two, square planer

( ) ( )II3 3 24 2

Ni NH NO .2H Omolecule may have two unpaired electrons or zero unpaired electron and measurement of magnetic moment helps us to predict the geometry.

15. If magnetic moment value is zero then the formula of the complex will be: (A) ( ) ( )3 3 24 2

Ni NH NO .2H O⎡ ⎤⎣ ⎦ (B) ( ) ( ) ( )3 2 3 32 2 2Ni NH H O NO .2NH⎡ ⎤⎣ ⎦

(C) ( ) ( ) ( )3 2 34 2 2Ni NH H O NO⎡ ⎤⎣ ⎦ (D) ( ) ( )3 2 32 2

Ni NO H O .4NH⎡ ⎤⎣ ⎦

16. If the magnetic moment value is 2 2and conducts electricity then the formula of the complex is: (A) ( ) ( )3 3 24 2

Ni NH NO .2H O⎡ ⎤⎣ ⎦ (B) ( ) ( ) ( )3 2 3 32 2 2Ni NH H O NO .2NH⎡ ⎤⎣ ⎦

(C) ( ) ( ) ( )3 2 34 2 2Ni NH H O NO⎡ ⎤⎣ ⎦ (D) ( ) ( )3 3 24 2

Ni NH NO .2H O⎡ ⎤⎣ ⎦ 17. The higher and lower value of magnetic moment of the given complex corresponds to the following

geometries respectively: (A) Octahedron and Tetrahedron (B) Octahedron and square planar (C) square planar and Octahedron (D) Octahedron and Octaheron

18. Match column Column – I Column - II

(a) ( )3 2Ag NH

+⎡ ⎤⎣ ⎦ (p) Octaherdral

(b) ( )2

3 4Cu NH

+⎡ ⎤⎣ ⎦ (q) Tetrahedral

(C) ( )2

2 6Cr H O

+⎡ ⎤⎣ ⎦ (r) Trigonal bipyramidal

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(d) ( )5Fe CO⎡ ⎤⎣ ⎦ (s) Square planar

(t) Linear

19. Match the Column List - I List -II

(a) ( )2

4Ni CN−

⎡ ⎤⎣ ⎦ (p) Tetrahedral

(b) [ ]24ZnCI − (q) Square planar

(c) ( )2

3 4Co en

+⎡ ⎤⎣ ⎦ (r) Octaherdral

(d) ( )2

3 4Zn NH

+⎡ ⎤⎣ ⎦ (s) Square pyramidal

20. Match column: Column – I (complex) column – II (conductance)

(a) ( )3 35Pt NH CI CI⎡ ⎤⎣ ⎦ (p) 229

(b) ( )3 33Pt NH CI CI⎡ ⎤⎣ ⎦ (q) 97

(c) ( )3 2 24Pt NH CI CI⎡ ⎤⎣ ⎦ (r) 404

(d) ( )3 46Pt NH CI⎡ ⎤⎣ ⎦ (s) 523

21. Match the column :

Column – I column – II

(a) Co- ordination isomerism (p) ( ) ( )3 6 6Cr NH Cr Cl⎡ ⎤ ⎡ ⎤⎣ ⎦ ⎣ ⎦

(b) Hydrate isomerism (q) ( )3 2 25Co NH NO Cl⎡ ⎤⎣ ⎦

(c) Lonisation isomerism (r) ( )3 2 24Pt NH Br Cl⎡ ⎤⎣ ⎦

(d) Linkage isomerism (s) ( ) ( )2 22 2Co Py H O Cl .Cl⎡ ⎤⎣ ⎦

22. Match the column:

Column – I (complex) column – II

(a) ( )4Ni CO⎡ ⎤⎣ ⎦ (p) 3sp -hybridisation

(b) ( )6Co COθ

⎡ ⎤⎣ ⎦ (q) Tetrahedral

(c) ( )2

4Fe CO

−⎡ ⎤⎣ ⎦ (r) E.A.N is 36

(d) ( )5Fe CO⎡ ⎤⎣ ⎦ (s) Neutral complex compound

(t) Central atom is member of 3d- transition series

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23. Match the complex (in column –I) with the geometry (in column II) Column – I column – II

(a) ( )4Ni CO (p) 3 2sp d

(b) ( )2

4Ni CN

−⎡ ⎤⎣ ⎦ (q) 3sp

(c) ( )4

6Fe CN

−⎡ ⎤⎣ ⎦ (r) 2 3d sp

(d) [ ]46MnF − (s) 2dsp

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24. Match the following

Column – I column – II

(a) ( )3

3Cr en

+⎡ ⎤⎣ ⎦ (p) Paramagnetic

(b) ( )3

6Mn CN

−⎡ ⎤⎣ ⎦ (q)

spin 15B.M.µ =

(c) ( )2

2 6Co H O

+⎡ ⎤⎣ ⎦ (r) Two unpaired electrons

(d) ( )3

6Fe CN

−⎡ ⎤⎣ ⎦ (s) Inner orbital complex

Single Answer Type Problems

25. Amongst the following ions which one has the highest paramagnetism?

(A) ( )3

2 6Cr H O+

⎡ ⎤⎣ ⎦ (B) ( )2

2 6Fe H O

+⎡ ⎤⎣ ⎦ (C) ( )

2

2 6Cu H O

+⎡ ⎤⎣ ⎦ (D) ( )

2

2 6Zn H O

+⎡ ⎤⎣ ⎦

26. The colour of Cu+ compounds is (A) White (B) yellow (C) orange (D) blue

27. Transition metal compounds are usually coloured. This is due to the electronic transition: (A) From p orbital to s-orbital (B) from d-orbital to s-orbital (C)from d orbital to p-orbital (D) within the d-orbitals

28. A substance which is not paramagnetic is: (A) ( )4 3

Cr ClO (B) 4KMnO (C) 3TiCl (D) 2VOBr

29. The calculated value of magnetic moment pf 322Ti

+ is: (A) 1.73 βµ (B) 2.83 βµ (C) 3.87 βµ (D) 4.9 βµ

30. The I.U.P.A.C.name of ( )3

6Fe CN−

⎡ ⎤⎣ ⎦ ion is: (A) Hexacyanidoferrate (II) ion (B) Hexacyanidoferrate (III) ion (C)hexacyanideiron (II) ion (D) hexacyanidoferrate (III) ion

31. The I.U.P.A. NAME OF ( )4Ni CO⎡ ⎤⎣ ⎦ is : (A) Tetracarbonylnickel (II) (B) Tetracarbonylnickel (0) (C) Tetracarbonylnickelate (II) (D) Tetracarbonylnickelate (0)

32. The number of ions produced by the complex ( )3 24Co NH Cl Cl⎡ ⎤⎣ ⎦ is:

(A) 2 (B) 3 (C) 4 (D) 6 33. The I.U.P.A. NAME OF ( )3 2 6

K Co NO⎡ ⎤⎣ ⎦ is: (A) Potassium (I) hexanitrocobaltate (II) (B) Potassium (I) hexanitrocobaltate (III) (C) Potassium hexanitrocobaltate (0) (D) Potassium hexanitrocobaltate (III)

34. Which of the following complex is diamagnetic ?

(A) [ ]36CoF − (B) [ ]24NiCl − (C) ( )2

3 6Ni NH

+⎡ ⎤⎣ ⎦ (D) ( )

2

4Ni CN

−⎡ ⎤⎣ ⎦

35. Which of the following is tridentate ligand? (A) 2NO− (B)Oxalate ion (C) Glycinate ion (D) dien

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36. How many ions are produced from ( )3 36

Co NH Cl⎡ ⎤⎣ ⎦ in the solution? (A) 3 (B) 4 (C) 5 (D) 6

37. The compound ( )2 3 2CoCl NH⎡ ⎤⎣ ⎦ can form :

(A) Geometrical isomers (B) coordination isomers (C) linkage isomers (D) optical isomers

38. The compound ( ) ( )2 3 2CoCl NH en⎡ ⎤⎣ ⎦ can form :

(A) linkage isomers (B) coordination isomers (C) Optical isomers (D) linkage as well as Optical isomers

39. A complex involving 2dsp -hybridization has: (A) A square planer geometry (B) a tetrahedral geometry (C)an octathedral geometry (D) trigonal planer geometry

40. Which of the following complex ion possesse 2 3d sp hybridization?

(A) ( )2

3 6Ni NH

+⎡ ⎤⎣ ⎦ ( B) [ ]36CoF − (C) ( )

3

3 6Co NH

+⎡ ⎤⎣ ⎦ (D) [ ]36FeF −

41. Which of the following complex has magnetic moment of 2.83 Bohr magneton ? (A) ( )

2

3 6Ni NH

+⎡ ⎤⎣ ⎦ (B) ( )

2

4Ni CN−

⎡ ⎤⎣ ⎦ (C) 4TiCl (D) [ ]6CoCl

42. Which of the following complex ion possesses 3 2sp d hybridization?

(A) ( )3

3 6Cr NH

+⎡ ⎤⎣ ⎦ (B) [ ]36FeF − (C) ( )

3

2 6Co NO

−⎡ ⎤⎣ ⎦ (D) [ ]36TiF −

43. Which of the following complex is paramagnetic ? (A) ( )2 4K Ni CN⎡ ⎤⎣ ⎦ (B) ( )4 6K Fe CN⎡ ⎤⎣ ⎦ (C) ( )3 36

Co NH Cl⎡ ⎤⎣ ⎦ (D) ( )2 46Cr H O SO⎡ ⎤⎣ ⎦

44. Dimethylgloxime is coordinated to 2Ni + through : (A) Two oxygen toms (B) two nitrogen atoms (C)two oxygen and one nitrogen atoms (D) two oxygen and two nitrogen atoms

45. According to crystal field theory, octahedral splitting and tetrahedral splitting of d orbitals caused by the same ligands are related through the expression : (A) o tΔ = Δ (B) o t4 9Δ = Δ (C) o t9 4Δ = Δ (D) o t2Δ = Δ

46. Which is the pair of ambident ligands? (A) 2CN ,NO− − (B) 3NO ,SCN− (C) 3 2N ,NO− − (D) 2

2 4NCS ,C O− − 47. Coordination number of 2

4 2Cu is........in CuSO .5H O.+ (A) 5 (B) 4 (C) 3 (D) 2

48. Co-ordination number of calcium is six in:

(A) ( )2

Ca EDTA−

⎡ ⎤⎣ ⎦ (B) 2 4CaC O (C) ( )2

2 4 2Ca C O

−⎡ ⎤⎣ ⎦ (D) 4 2CaSO .4H O

49. E. A. N. of Fe is …. In ( )3

2 4 3Fe C O

−⎡ ⎤⎣ ⎦

(A) 27 (B) 24 (C) 35 (D) 29

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50. Increasing order of E A N of the metals in ( ) ( ) ( )

2 3 3

4 6 4Ni CN , Fe CN and Cu CN− − −

⎡ ⎤ ⎡ ⎤ ⎡ ⎤⎣ ⎦ ⎣ ⎦ ⎣ ⎦ is:

(A) ( ) ( ) ( )2 33

64 4Ni CN Fe CN Cu CN

−−⎡ ⎤ ⎡ ⎤⎡ ⎤< <⎣ ⎦⎣ ⎦ ⎣ ⎦ (B) ( ) ( ) ( )

32 3

4 6 4Ni CN Fe CN Cu CN

−− −⎡ ⎤⎡ ⎤ ⎡ ⎤< =⎣ ⎦ ⎣ ⎦⎣ ⎦

(C) ( ) ( ) ( )32 3

4 4 6Ni CN Cu CN Fe CN

−−⎡ ⎤⎡ ⎤ ⎡ ⎤< <⎣ ⎦ ⎣ ⎦ ⎣ ⎦ (D) ( ) ( ) ( )

33 2

4 6 4Cu CN Fe CN Ni CN

−− −⎡ ⎤⎡ ⎤ ⎡ ⎤< <⎣ ⎦ ⎣ ⎦⎣ ⎦

51. ( ) ( )3 6 6Co NH Cr CN⎡ ⎤ ⎡ ⎤⎣ ⎦ ⎣ ⎦and ( ) ( )3 6 6

Cr NH Co CN⎡ ⎤ ⎡ ⎤⎣ ⎦ ⎣ ⎦are : (A) Linkage (B) ionization isomers (C) coordination isomers (D) none of these

52. One mol of the complex 3 2CoCl .6H Oon reaction with excess of 3AgNO gives two mol of white precipitate. Thus, complex is : (A) [ ]2 36

Co H O Cl⎡ ⎤⎣ ⎦ (B) ( ) .2 2 25

Co H O Cl Cl H O⎡ ⎤⎣ ⎦

(C) ( )2 2 24Co H O Cl Cl.2H O⎡ ⎤⎣ ⎦ (D) ( )2 3 23

Co H O Cl .3H O⎡ ⎤⎣ ⎦

53. The crystal field splitting energy for octahedral ( )oΔ and tetrahedral ( )tΔ complexes is related as:

(A) t o49

Δ = Δ (B) t o12

Δ = Δ (C) o t2Δ = − Δ (D) o t49

Δ = − Δ

54. Which has maximum co-ordinating (donor) points ? (A) DMG (B) EDTA (C) en (D) py

55. Which is used in cancer – chemotherapy ? (A) Cis – platin (B) Zeisse’s salt (C) both (a) and (b) (D) None of these

56. Arrange the following in order of decreasing number of unpaired electrons:

I : ( )2

2 6Fe H O

+⎡ ⎤⎣ ⎦ II : ( )

3

6Fe CN

−⎡ ⎤⎣ ⎦ III : ( )

4

6Fe CN

−⎡ ⎤⎣ ⎦ IV : ( )

3

2 6Fe H O

+⎡ ⎤⎣ ⎦

(A) IV, I, II, III (B) I, II, III, IV (C) III, II, I, IV (D) II, III, I, IV 57. In which of the following compound transition metal may have zero oxidation state?

(A) ( )5Fe CO⎡ ⎤⎣ ⎦ (B) ( )2

4Ni CN

−⎡ ⎤⎣ ⎦ (C) 2 3Fe O (D) 5CrO

58. A square planar complex is formed by hybridization of which atomic orbitals : (A) x y yzs,p p d (B) 2 2x y x z

s,p p d−

(C) 2x y zs,p p d (D) y ' z ' xys,p p d

59. Among ( ) [ ]244Ni CO , NiCl −⎡ ⎤⎣ ⎦ and [ ]24NiCl − species, the hybridization state of Ni atoms are respectively :

(A) 3 2 2sp ,ds p,dsp (B) 3 2 3sp ,dsp ,sp (C) 3 3 2sp ,sp ,dsp (D) 2 3 3dsp ,sp ,sp 60. The most stable ion is :

(A) ( )3

2 4 3Fe C O

−⎡ ⎤⎣ ⎦ (B) ( )

3

6Fe Cl

−⎡ ⎤⎣ ⎦ (C) ( )

3

6Fe SCN

−⎡ ⎤⎣ ⎦ (D) ( )

3

2 6Fe H O

+⎡ ⎤⎣ ⎦

61. One mole of complex compound ( )3 35Co NH Cl gives 3 moles of ions on dissolution in water. One mole of

same complex reacts with two moles of 3AgNO to yield two moles of (s)AgCl . The complex is :

(A) ( )3 2 34Co NH Cl Cl.NH⎡ ⎤⎣ ⎦ (B) ( )3 2 34

Co NH Cl Cl .NH⎡ ⎤⎣ ⎦

(C) ( )3 25Co NH Cl Cl⎡ ⎤⎣ ⎦ (D) ( )3 3 33

Co NH Cl .2NH⎡ ⎤⎣ ⎦

62. Which one of the following has the regular tetrahedral structure ? (A) ( )

2

4Ni CN

−⎡ ⎤⎣ ⎦ (B) 4SF (C) 4BF− (D) 4XeF

63. The value of ‘spin only’ magnetic moment for one of the following configuration is 2.84 B.M. the correct one is: (A) 4d (in strong field ligand) (B) 2d (in weak field ligand) (C) 3d (in weak as well as in strong field ligand) (D) 5d (in strong field ligand)

64. The oxidation number of Pt in ( )2 4 3Pt C H Clθ

⎡ ⎤⎣ ⎦ is: (A) +1 (B) +2 (C) +3 (D) +4

65. Which of the following compound is not coloured ? (A) [ ]2 4Na CuCl (B) [ ]2 4Na CdCl (C) ( )4 6

K Fe CN⎡ ⎤⎣ ⎦ (D) ( )3 6K Fe CN⎡ ⎤⎣ ⎦

66. What is the shape of Fe ( )5CO molecule and which of the following d- orbitals involved in bridisation?

(A) Tetrahedral 2 2x yd

− (B) Trigonal bipyramodal 2 2x y

d−

(C) Trigonal bipyramodal 2zd (D)square pyramidal

MULTIPLE CHOICE:

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67. Select correct statements: (A) ( )

2

3Ni en

+⎡ ⎤⎣ ⎦ is less stable than ( )

2

3 6Ni NH

+⎡ ⎤⎣ ⎦

(B) Increase in stabi;ity of the complexes due to presence of multidentate cyclic ligand is called ,macro- cyclic effect

(C) ( )2

3Ni en

+⎡ ⎤⎣ ⎦ is more stable than ( )

2

3 6Ni NH

+⎡ ⎤⎣ ⎦

(D) For a given ion and ligand, greater the charge on the metal ion, greater the stability 68. The complex ( )

2

2 5Fe H O NO

+⎡ ⎤⎣ ⎦ is formed in the brown ring test for nitrates when freshly prepared

4FeSO solution is added to aqueous solution 3NO− followed by addition of conc. 2 4H SO .select correct statements about this complex (A) Colour change is due to charge transfer (B) It has iron in +1 oxidation sate and nitrosyl as NO+ (C) It has magnetic moment of 3.87 B. M> confirming three unpaired electrons In Fe (D) In complex Fe has 2 3d sp hybridisation

69. The co-ordination number of a central metal atom in a complex (s) is are not determined by: (A) The number of only anionic ligands bonded to the metal ion (B) The number of ligands around a metal ion bonded by π-bonds (C) The number of ligands around a metal ion bonded by σ and π-bonds both (D) The number of ligands around a metal ion bonded byσ bonds

70. Which of the following pairs are not represent linkage isomers? (A) ( ) ( ) [ ]3 3 44 4

Cu NH Pt NH CuCl⎡ ⎤ ⎡ ⎤⎣ ⎦ ⎣ ⎦ (B) ( ) ( ) ( ) ( )3 32 2 2 2Pd PPh NCS and Pd PPh SCN⎡ ⎤ ⎡ ⎤⎣ ⎦ ⎣ ⎦

(C) ( ) ( ) ( ) ( )3 3 4 3 4 35 5Co NH NO SO and Co NH SO NO⎡ ⎤ ⎡ ⎤⎣ ⎦ ⎣ ⎦ (D) ( ) ( )2 3 2 2 3 24 4

PtCl NH Br and PtBr NH Cl⎡ ⎤ ⎡ ⎤⎣ ⎦ ⎣ ⎦

71. Colourless, tetrahedral complex among the following are: (A) ( )3 4

K Cu CN⎡ ⎤⎣ ⎦ (B) [ ]2 4Na NiCl (C) [ ]4K BF (D) ( )4Ni CO 72. Pick out correct statement /(s) from the following :

(A) Inner orbital octahedral complexes of 2Ni + ion are not formed (B) ( )

3

2 6Fe H O

+⎡ ⎤⎣ ⎦ ion is more paramagnetic than ( )

3

6Fe CN

−⎡ ⎤⎣ ⎦ ion

(C) [ ]24NiCl − is diamagnetic but ( )4Ni CO⎡ ⎤⎣ ⎦ is paramagnetic

(D) The magnetic moment of [ ]24MnCl − ion is 5.92 BM 73. Which of the following is / are characteristic of a tetrahedral complex?

(A) The 2 2 2x y zd andd

−orbitals are the low energy orbitals

(B) Most tetrahedral complex are high spin (C) Crystal field splitting is double found in octahedral complex (D) The splitting pattern is just opposite of that in octahedral complex

74. A d-book element forms octahedral complex but its spin magnetic moment remains same either in strong field or in weak field or in weak field ligand. Which of the following is / are correct? (A) Element always forms colourless compound (B) Number of electrons in 2gt orbitals are higher than in ge orbitals

(C) It can have either 3 8d or d configuration (D) It can have either 7 8d or d configuration

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ANSWER CO-ORDINATION COMPOUND

(1) A (2) C (3) A (4) D (5) D (6) D

(7) B (8) C (9) C (10) C (11) A (12) A

(13) B (14) B (15) A (16) C (17) B

(18) A -T (19) A – q (20) A- r (21) A – p (22) A –p,q,r,s,t

B –s B – p B- q B – s B – p,q,r,t

C –p C – r C – p C – q,r C –p,q,r,t

D - r D - p D - s D - q D – r,s,t

(23) A – q (24) A- p,q,r

B – s B – p,r,s

C – s C – p,q

D - p D – p,s

(25) B (26) A (27) D (28) B (29) A (30) B

(31) B (32) A (33) D (34) D (35) D (36) B

(37) A (38) C (39) A (40) C (41) A (42) B

(43) D (44) D (45) B (46) A (47) B (48) A

(49) C (50) A (51) C (52) B (53) A (54) B

(55) A (56) A (57) A (58) B (59) B (60) A

(61) B (62) C (63) B (64) B (65) B (66) C

(67) B, C, D (68) A, B,C (69) A,B,C (70) A,C,D (71) A,C,D (72) A,B,D

(73) A,B,D (74) B,C