CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 1 Examinations 2008/09
Module Title: Inorganic Chemistry
Module Code:
CHEM 6006
School:
School of Science
Programme Title:
Bachelor of Science in Analytical and Pharmaceutical Chemistry –
Stage 2
Programme Code:
SCHEM_7_Y2
External Examiner(s):
Internal Examiner(s):
Dr. B. O’Regan
Mr. S.P. McCarthy
Instructions:
Answer FOUR questions. All questions carry equal marks.
Duration:
2 Hours
Sitting:
Winter 2008
Requirements for this examination:
Note to Candidates: Please check the Programme Title and the Module Title to ensure that you have received the
correct examination paper.
If in doubt please contact an Invigilator.
Page 1 of 5
0.2 grams of the complex compound [1] was dissolved in 50cm3 of dilute sulphuric acid
Q1.
solution. The solution was heated to 80oC and titrated with 0.02M potassium
permanganate solution. A titre of 26.90cm3 was obtained.
K3 [Al (C2O4)3] x H2O
[1]
(a)
Write down the balanced chemical equation for the reaction scheme.
o
(5 marks)
(b)
Why is a temperature of 80 C required?
(3 marks)
(c)
What is the colour change at the end point of the titration?
(3 marks)
(d)
Give the correct IUPAC name of the complex compound.
(4 marks)
(e)
Calculate the degree of hydration (x) of the complex compound.
(10 marks)
Useful data:
Atomic masses:
Q2.
K
39.01 a.m.u.
Al
26.98 a.m.u.
C
12.01 a.m.u.
O
15.99 a.m.u.
H
1.007 a.m.u.
For the following complexes:
(i)
K3 [Fe(CN)6]
(ii)
[Ni(NH3)6](BF4)2
(iii)
Ni(CO)4
(iv)
K2[PtCl4]
(a)
Give the IUPAC names of the complexes.
(6 marks)
(b)
State the oxidation states of the transition metals.
(4 marks)
(c)
Give the electronic configuration of the metal in these oxidation states.
(3 marks)
(d)
State whether the compounds are diamagnetic or paramagnetic.
(2 marks)
(e)
Describe the bonding and stereochemistry of the compounds.
(10 marks)
Page 2 of 5
Q3. (a)
For the radioactive decay of Radium
226
88
4
Ra→ 222
86 Rn + 2 He
Calculate the energy change (∆E) in kilojoules when:
(i)
One mole of Radium decays.
(ii)
One gram of Radium decays.
Useful data:
Atomic masses:
226
88
Ra
= 225.9771 a.m.u.
222
86
Rn
= 221.9703 a.m.u.
4
2
He
= 4.0015 a.m.u.
Avogadro’s Number = NA = 6.02 x 1023
(b)
Q4.
Velocity of light = c = 3 x 108 ms-1
(15 marks)
Write a concise note on the disposal of Radioactive waste.
(10 marks)
Write concise notes on two of the following:
(a)
Biochemical oxygen demand analysis (BOD).
(13 marks)
(b)
Silicones and their important commercial uses.
(12 marks)
(c)
Halides of the elements.
(12 marks)
Q5. (a)
Complete the following reactions where
M = Mg , Ca, Sr , Ba
M + O2 →
M + X2 →
(X
= F , Cl , Br , I )
M + N2 →
M +C →
M + H 2O →
M + H2 →
(9 marks)
Page 3 of 5
(b)
Discuss the Alkaline Earth group or elements under the headings:
(i)
Group physical properties
(6 marks)
(ii)
Industrial extraction
(4 marks)
(iii)
Uses
(6 marks)
Write concise notes on two of the following:
Q6.
(a)
Modern manufacture and important uses of nitric acid.
(13 marks)
(b)
Semi conductors.
(12 marks)
(c)
Hydrides of the elements.
(12 marks)
Page 4 of 5
Page 5 of 5