PPSC Chemistry Lecturer Preparation (Test # 12)- Malik Xufyan 03137355727

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PPSC CHEMISTRY CLASS
Test Session
CH: d-Block Elements
Test # 12
For more WhatsApp # 0313-7355727
Topics:
1- Werner Theory
2- Crystal Field Theory
3- Applications of CFT
Werner Theory
1. What was the term proposed by Werner for the number of groups bound directly to
the metal ion in a coordination complex?
a) Primary valence
b) Secondary valence
c) Oxidation number
d) Polyhedra
2. Oxidation state of a metal corresponds to
a) Primary valency
b) Secondary valency
c) Tertiary valency
d) All of these
3. Which is the counter ion in [Pd(NH3)4]2+2Cl–?
a) Pd2+
b) [Pd(NH3)4]2+
c) Cl–
d) It does not have a counter ion
4. Werner proposed that the primary valences are ionizable and are satisfied only by
positive ions.
a) True
b) False
5. Werner postulated that octahedral, tetrahedral and square planar geometrical shapes
are more common in coordination compounds of ________
a) alkali metals
b) lanthanides
c) actinides
d) transition metals
6. Given that 1 mol of NiCl2.6H2O with excess AgNO3 precipitates 2 mols of AgCl, what
is the secondary valence of Ni?
a) 1
b) 2
c) 4
d) 6

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7. If Pt in PtCl4.2HCl has a secondary valence of 6, how many mols of AgCl will 1 mol of
the compound precipitate with excess AgNO3?
a) 0
b) 1
c) 2
d) 4
8. What is the sum of the oxidation number of cobalt in [Co(H2O)(CN)(en)2]2+and
[CoBr2(en)2]+?
a) +3
b) +6
c) +5
d) +4
9. What is the primary valence of iron in the coordination entity of compound
Fe4[Fe(CN)6]?
a) 0
b) +2
c) +3
d) +4
10. What is the colour of the compound CoCl3.5NH3?
a) Yellow
b) Purple
c) Green
d) Violet
Crystal Field Theory
11. The energy diagram of the d orbital energy splitting complexes in octahedral
geometry, shows the d orbitals with higher in energy (eg ) which refer to _____________
d orbitals
a) dz2
b) dxy, dxz and dyz
c) dz2
and dx2
- y2
d) dxy and dxz
12. The sp3d2 hybridization of central atom of a molecule would lead to
a) Square planar
b) Tetrahedral
c) Trigonal bipyramidal
d) Octahedral
13. Which of the following complexes shows zero crystal field stabilization energy?
a) [Co(H2O)6]3+
b) [Fe(H2O)6]3+
c) [Co(H2O)6]2+
d) [Mn(H2O)6]3+
14. Which of the following d orbitals take part in the octahedral complex with d2sp3
hybridisation?
a) dxy, dyz

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b) dxz, dx2−y2
c) dx2−y2, dz2
d) dz2, dxz
15. Which of the following is paramagnetic?
a) [CoBr]42-
b) Mo(Co)6
c) [Pt(en)Cl2]
d) [Co(NH3)6]3+
16. For a high spin d4 octahedral complex the crystal field splitting energy will be
a) -1.6 Δo
b) -0.8 Δo
c) -0.6 Δo
d) -1.2 Δo
17. The correct increasing order of splitting power of ligands according to
spectrochemical series is
a) Cl– < OH– < CN–
b) Cl– < CN– < OH–
c) OH– < Cl– < CN–
d) OH– < CN– < Cl–
18. Which of the following is a bidentate ligand?
a) Br
b) CH3NH2
c) C2O42-
d) CH3CN
19. How many unpaired electrons are present in [CoF6]3- complex?
a) 4
b) zero
c) 2
d) 3
20. The compound, which does not contain a metal-carbon bond is
a) K[Pt(C2H4)Cl3]
b) C2H5MgBr
c) Ni(CO)4
d) Al(OC2H5)3
21. Which of the following complexes has a magnetic moment of 1.73 BM?
a) [Ni(CN)4]2-
b) TiCl4
c) [Cu(NH3)4]2+
d) [CoCl6]4-
22. Tetraamminecopper(II) sulphate is ___ in colour.
a) violet
b) blue
c) green
d) red

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Applications of CFT
23. For high spin complexes
a) Crystal field splitting < Pairing energy
b) Crystal field splitting > Pairing energy
c) Crystal field splitting + Pairing energy
d) Crystal field splitting = Pairing energy
24. For low spin complexes
a) Crystal field splitting < Pairing energy
b) Crystal field splitting > Pairing energy
c) Crystal field splitting + Pairing energy
d) Crystal field splitting = Pairing energy
25. The relation between tetrahedral and octahedral crystal field splitting is
a) Δo = 4/9 Δt
b) Δt = 9/4 Δo
c) Δt = 5/9 Δo
d) Δt = 4/9 Δo
26. Value of crystal field stabilization energy (Δo ) for [Co(CN)6]3− is
a) -2.4
b) 2.4
c) 2.0
d) 3.0
27. Value of crystal field stabilization energy (Δo ) for [Fe(CN)6]3− is
a) -2.5
b) 2.4
c) -2.0
d) 3.0
28. Value of crystal field stabilization energy (Δo ) for [CoCl6]4− is
a) 1.5
b) 2.4
c) 4.0
d) -0.8
29. The formula to calculate magnetic moment is
a) μ = √n(n+2)
b) μ = n√(n+2)
c) μ = √2(n+2)
d) μ = √n(n+4)
30. Value of magnetic moment for d6 high spin (t2g4 eg2) complex is
a) 3.5 BM
b) 4.90 BM
c) 1.73 BM
d) 2.83 BM
31. Value of magnetic moment for d7 low spin (t2g6 eg1) complex would be
a) 3.5 BM
b) 4.90 BM

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c) 1.73 BM
d) 2.83 BM
32. Which of the following compounds is expected to be colored?
a) Ag2SO4
b) CuF2
c) MgF2
d) CuCl
33. Which one of the following ions exhibits colour in aqueous solution?
a) Sc3+
b) Ni2+
c) Ti4+
d) Zn2+
34. The colour of zinc sulphide is:
a) white
b) black
c) brown
d) red
35. Which of the following compounds is coloured ?
a) TiCl3
b) FeCl3
c) CoCl2
d) All of the above