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ICH602S - INORGANIC CHEMISTRY - 2ND OPP - JAN 2023 |
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nAmlBIA unlVERSITY
OF SCIEnCE Ano TECHnOLOGY
FACULTYOF HEALTH,NATURALRESOURCESAND APPLIEDSCIENCES
DEPARTMENT OF NATURAL AND APPLIED SCIENCES
QUALIFICATION: BACHELOROF SCIENCE
QUALIFICATION CODE: 07BOSC
LEVEL: 6
COURSE CODE: ICH602S
COURSE NAME: INORGANIC CHEMISTRY
SESSION: JANUARY 2023
PAPER: THEORY
DURATION: 3 HOURS
MARKS: 100
SUPPLEMENTARY/SECOND OPPORTUNITY EXAMINATION QUESTION PAPER
EXAMINER(S} DR. EUODIA HESS
MODERATOR: PROFHABAUKA KWAAMBWA
INSTRUCTIONS
1. Answer ALL the questions.
2. Write clearly and neatly.
3. Number the answers clearly
4. All written work must be done in blue or black ink and sketches can
be done in pencil
5. No books, notes and other additional aids are allowed
PERMISSABLE MATERIALS
Non-programmable calculators
ATTACHMENTS
1. List of useful constants
2. Periodic Table
THIS QUESTION PAPER CONSISTS OF 8 PAGES {Including this front page, list of useful constants
and Periodic Table)
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SECTIONA: MULTIPLECHOICEQUESTIONS
[40]
• There are 20 multiple choice questions in this section. Each question carries 2 marks.
• Answer ALL questions by selecting the letter of the correct answer.
• Choose the best possible answer for each question, even if you think there is another
possible answer that is not given.
1. What are oxidation states of metal ion in following complexes?
A. PdCl2
B. Pd(PPh3)4
C. Pd(OAc)2
D. ArPdBr where Ar is aryl
2. Which of the following complex has a highest oxidation state of metal?
A. (ri6-C&H&)2Cr
B. Mn(CO)sC
C. Na2[Fe(CO)4]
D. K[Mn(CO)s]
3. What is the oxidation state of molybdenum in [ri7-tropylium) Mo(CO)3]+?
A. +2
B. +1
C. 0
D. -1
4. Which of the following is the neutral complex which follows the 18- electron rule?
A. (ri5-CsHs)Fe(CO)2
B. (ri5-CsHs)2Mo(CO)
C. (ri5-CsHs)2Co
D. (ri5-CsHs)2Re(ri6-C&H&)
5. As pure molecular solids, which of the following exhibits dipole-dipole intermolecular
forces: HBr, NBr3, SBr2,and CBr4?
A. HBr only
B. C8r4 and NBr3
C. HBr and SBr2
D. HBr, NBr3, and SBr2
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6. Which of the following molecules is expected to form hydrogen bonds in the pure liquid
or solid phase: ethanol (CH3CH20H},acetic acid (CH3C02H},acetaldehyde (CH3CHO),and
dimethyl ether (CH30(H3}?
A. ethanol only
B. acetaldehyde only
C. ethanol and acetic acid
D. dimethyl ether and ethanol
7. When a water molecule forms a hydrogen bond with another water molecule, which atoms
are involved in the interaction?
A. a hydrogen from one molecule and a hydrogen from the other molecule
B. an oxygen from one molecule and an oxygen from the other molecule
C. a hydrogen from one molecule and an oxygen from the other molecule
D. an oxygen and a hydrogen from the same molecule
8. Arrange H2S,H2Se,and H2Tein order from lowest to highest boiling point.
A. HF<HCl<HBr
B. HF<HBr<HCI
C. HCI < HBr< HF
D. HBr < HF< HCI
9. In any cubic lattice an atom lying at the face of a unit cell is shared equally by how many
unit cells?
A. 2
B. 1
C. 4
D. 8
10. Arrange the three common unit cells in order from least dense to most dense packing.
A. primitive cubic< body-centered cubic< face-centered cubic
B. face-centered cubic< body-centered cubic< primitive cubic
C. primitive cubic< face-centered cubic< body-centered cubic
D. body-centered cubic< primitive cubic< face-centered cubic
11. If a metal crystallizes in a body-centered cubic lattice, each metal atom has __ "
nearest neighbors."
A. 8
B. 6
C. 4
D. 2
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12. What is the distance, in atomic radii, along any edge of a body-centered cubic unit cell?
A. (4x r) /V3
B. 2 X r
C. 4 X r
D. (2 x r) / V3
13. Nickel has a face-centered
of a nickel atom?
A. 62.3 pm
B. 88.1 pm
C. 125 pm
D. 249 pm
cubic cell, and its density is 8.90 g/cm 3• What is the radius (in pm)
14. Rhodium crystallizes in a face-centered
What is the density of rhodium?
A. 0.777 g/cm 3
B. 3.11 g/cm 3
C. 12.4 g/cm 3
D. 6.22 g/cm 3
cubic lattice with an edge length of 380.1 pm.
15. Iridium (atomic mass 192.2 g/mol), with an atomic radius of 135.5 pm, crystallizes in a
face-centered cubic lattice. What is the density of iridium?
A. 1.41 g/cm 3
B. 2.83 g/cm 3
C. 5.66 g/cm 3
D. 11.3 g/cm 3
16. Iron crystallizes in the body-centered cubic system. If the edge of the unit cell is 290 pm,
what is the radius of a iron atom in picometers?
A. 504 pm
B. 402 pm
C. 672 pm
D. 126 pm
17. Which of the following statements concerning valence bond (VB) theory is/are CORRECT?
A. VB theory can describe molecular bonding in excited states
B. VB theory assumes that electrons are localized between pairs of atoms
C. VB theory predicts localized lone pairs of electrons
D. A and B
18. How many sigma (cr) bonds and pi (TI) bonds are in carbon monoxide?
A. three a, zero TI
B. two o, one TI
C. two o, two TI
D. one o, two TI
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19. To form a molecule with a tetrahedral electron pair geometry, what set of pure atomic
orbitals must be mixed?
A. ones and two p
B. ones and three p
C. twos and one p
D. ones and one p
20. What is the hybridization of the central nitrogen atom in N2O?
A. sp2
B. sp3
C. sp
D. None of the above
SECTIONB:
[60]
There are THREE(3) questions in this section. Answer all Questions.
Show clearly, where necessary, how you arrive at the answer as the working will carry marks to.
Question 1
[30]
1.1 Specify the oxidation number of the central metal atom in each of the following
compounds:
(10)
a) [Ru(NH3)s(H2O)]Cl2
b) [Cr(NH3)5](NO3}3
c) [Fe{CO)s]
d) K4[Fe{CN)5]
e) [PtCl5]2-
l.2 What are the systematic names for the following ion and compounds?
{10)
a) [cis-Co(en)2C'2]+
b) [Pt(NH3)sCl]Cl3
c) [Co(NH3)sCl]Cl2
d) [Cr(en)3]Cl2
e) NaAUF4
1.3 Write the formulas for the following compounds:
(10)
a) bis(ethylenediamine)dichlorochromium(III)
b) pentacarbonyliron(0)
c) potassium tetracyanocuprate(II)
d) tetraammineaquachlorocobalt(l ll)chloride
e) sodium hexanitrocobaltate(III)
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Question 2
[20]
2.1 What kind of intermolecular/attractive forces must be overcome to in order to:
(3)
a) melt ice
b) boil molecular bromine
c) melt solid iodine
2.2 Calculate the number of spheres (atoms per unit cell) that would be found within a simple
cubic, a body and a face-centered cubic cell? Assume the spheres are the same.
(6)
2.3 When silver crystallizes, it forms face-centered cub.iccells. The unit cell edge length is
409 pm. Calculate the density of silver.
(8)
2.4 What are the different types of crystalline structures (crystals)?
(3)
Question 3
3.1 Do [lrBr2(CH3){CO)(PPh3)]and [Cr(ri.5-CsHs)(CGHGo)]bey 18-electron rule? Show your working.
3.2 Give the formal names of ferrocene and [RhMe(PMe3)4]
[10]
(6)
(4)
END OF EXAMINATION
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USEFULCONSTANTS:
Gas constant, R =8.3145 J ·mol- 1 · K-1 =0.083145 dm 3 · bar· mo1-1 · K-1 =0.08206 L atm mol-1 · K-1
1 Pa· m3 =1 kPa.L = 1 N ·m =1 J
1 atm = 101 325 Pa= 760 mm Hg= 760 torr
Avogadro's Number, NA= 6.022 x 1023 mo1-1
Planck's constant, h = 6.626 x 10-34 Js
Rydberg constant, Rh= 2.18 x 10-18 J
Speed of light, c = 2.998 x 108 ms-1
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PERIODICTABLE OF THE ELEMENTS
18
l
2
H
1.00794 2
13
14
15
He
16
17 4.00260
34
5 6 7 8 9 10
Li Be
B C N 0 F Ne
6.941 9.01218
10.81 12.011 14.0067 15.9994 18.9984 20.179
t 1 12
Na Mg
22.9898 24.305 3
4
5
6
13 14 15 16 17 18
Al Si p s Cl Ar
7
g
9
10
11
12 26.9815 28.0855 30.9738 32.06 35.453 39.948
19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
K Ca Sc Ti V Cr Mn Fe Co. Ni Cu Zn Ga Ge As Se Br Kr
39.0983 40.08 44.9559 47.88 50.9415 51.996 54.9380 55.847 58.9332 58.69 63.546 6538 69.72 72.59 74.9216 78.96 79.904 83.8
""CJ
OJ
37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
O'Q
ro
Rb Sr y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
00
0....,
00
85.4678 87.62 88.9059 91.22 92.9064 95.94 (98) 101.07 102.906 106.42 107.868 112.41 114.82 118.69 121.75 127.6 126.9 131.29
55 56 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86
Cs Ba Lu Hf Ta w Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
132.905 137.33 174.967 178.49 180.948 183.85 186207 190.2 192.22 195.08 196.967 200.59 204.383 207.2 208.908 (209) (210) (222)
87 88 103 104 105 106 107 108 109 110 111 112
114
116
118
Fr Ra Lr Rf Db Sg Bh Hs Mt Uun Uuu Uub
Uuq
(223) 226.025 (260) (261) (262) (263) (264) (265) 1(268) (269) (272) (269)
Uuh
Uuo
Lantbanides: 57 58 59 60 61 62 63 64 65 66 67 68 69 70
La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb
138.906 140.12 140.908 144.24 (145) 150.36 151.96 157.25 158.925 162.50 161.930 167.26 166.934 173.04
Actinides:
89 90 91 92 93 94 95 96 97 98 99 100 101 102
Ac Th Pa u Np Pu Am Cm Bk Cf Es Fm Md No
227.028 232.038 231.036 238.029 237.048 (244) (243) (247) (247) (251) (252) (257) (258) (259)