Assignment 02 A
1- Sketch an MO diagram to describe the bonding in [He2]2+. From the result, you can say that:
a) the ion is paramagnetic
b) the ion has a bond order of zero
c) the ion is likely to be less stable than He2
d) the ion is diamagnetic
2- Sketch an MO diagram for O2. Using the information in the diagram, which statement is
incorrect?
a) O2 is diamagnetic
b) The bond order in O2 is 2
c) The bonding in O2 has a π-component.
d) The bonding in O2 has a σ-component.
3- Which of the following molecules is non-polar?
a) BCl3
b) SO2
c) H2S
d) OF2
4- For which of the following molecules would VSEPR theory predict a trigonal pyramidal
structure?
a) PF3
b) BF3
c) ClF3
d) BrF3
5- The correct ordering of the electronegativities of the following atoms is:
a) N < O < H
b) H < N < O
c) H < O < N
d) O < N < H
6- Select the better choice in each of the following, and explain your selection briefly:
a. Higher ionization energy: Ca or Sr
b. Higher ionization energy: Mg or Al
c. Higher electron affinity: C or N
7- Use the Lewis structure model to deduce the type of nitrogen–nitrogen bond present in
(a) N2H4 , (b) N2F4, (c) N2F2 and (d) [N2H5]+.
(a) single , (b) single, (c) double (d) single
