VAAL UNIVERSITY OF TECHNOLOGY
COURSE: INORGANIC CHEMISTRY III
COURSE CODE: (AAICA3B)
TEST: 1
DATE: 12 MARCH 2014
TOTAL MARKS: 40
FULL MARKS: 35
QUESTION 1 [40]
1.1
Draw a molecular orbital energy level diagrams of LiF and CO. Explain the
differences between the two diagrams.
(10)
1.1.1 Calculate the bond orders of the two molecules LiF and CO from their
molecular orbital diagrams and determine which molecule will be most stable?
(5)
1.2
Explain the difference in the two molecular orbital diagrams of N2 and O2. (3)
1.3
1.3.1
1.3.2
1.3.3
Prepare a molecular orbital energy level diagram for the cyanide ion, CN–.
What is the bond order of a cyanide ion?
How many unpaired electrons does cyanide have?
Is CN– paramagnetic or diamagnetic?
1.4
(6)
(2)
(1)
(1)
For each of the following molecules,(a) draw the Lewis structures, (b) predict
the geometry, (c) determine the molecular polarity (polar or non-polar) and (d)
predict the possible hybridization that will be expected around the central
atom:
(4)
1.4.1 PO43–
(4)
1.4.2 SF6
1
1.5 Estimate the bond angles, the geometry and the hybridization around carbon
and nitrogen in the following molecule:
(4)
. .
2