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(CHEM131)[2002](f)midterm~hzhongaa^_21549.pdf
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Name: _______________________ Student ID: ____________________
Chem 131 Inorganic Chemistry I Midterm Examination
Friday, October 25, 2002. Time allowed, 120 minutes. Total 100 points
Note: I prepared the answers in rush. It may contain mistakes. Please let me know if you find obvious mistakes.
Section I. Multiple Choices ( 2 points each, 42 points total). For each question, select the most appropriate answer by either writing it out or circling your choice.
1. Which of the following statement is correct?
(a)
Bohr model could explain the emission spectrum of hydrogen.
(b)
Bohr model can be used to build electronic configurations of many-electron atoms.
(c)
All Bohr's assumptions have been verified experimentally to be correct.
(d)
more than one of them (e) none of them
(a)
2. The energy of an electron in 1s orbital of hydrogen is -13.6 eV. The energy of an electron in 2s orbital of He+ should be
(a)
-13.6 eV (b) -6.8 eV (c) -27.2 eV (d) -54.4 eV
(e)
none of them
(a)
3. Which of the following sets of quantum numbers are NOT allowed for an electron in an atom?
(a)
n = 5, l = 5, ml = 4, ms = 1/2
(b)
n = 4, l = -2, ml = 2, ms = 1/2
(c)
n = 8, l = 7, ml = 0, ms = 1/2
(d)
n = 6, l = 5, ml = -5, ms = 1/2
(e)
more than one of them
(e)
4. Which of the following atomic orbital designations are NOT possible?
(a)
5d (b) 6f (c) 2d (d) 3f
(e)
more than one of them
(e)
5. The maximum number of electrons that can be put in the n = 5 shell is
(a)
5 (b) 10 (c) 25 (d) 50 (e) none of them
(d)
6. The number of radial (spherical) nodes of a 5d orbital is:
(a)
1 (b) 2 (c) 3 (d) 4
(e)
5 (f) none of them
(b)
7. Which of the following statements is correct?
(a)
4p and 4d have the same number of radial nodes
(b)
4p and 4d have the same number of angular nodes
(c)
4p and 5p have the same number of radial nodes
(d)
4p and 5p have the same number of angular nodes
(e)
more than one of them
(f)
none of them
(d)
8. The relative energies of 3p, 3d, 4s and 4p of H are in the following order:
(a)
3p<3d<4s<4p (b) 3p<4s<3d<4p (c) 3s=3p < 4s =4p
(d)
none of them
(c)
9. The number of valence electrons of Re is
(a)
2 (b) 5 (c) 7 (d) 8 (e) none of them
(c)
10. The M3+ has a electronic configuration of [Kr]4d6. The M is
(a)
Mo (b) Cr (c) Co (d) Rh (e) none of them
(d)
11. Which of the following is a correct resonance structure of [SeO3]2-?
..
2-
2-
:O :
:O :
..
..
..
..
O (b) : OSe O:
(a) O Se .. .... ..
..
2-..
2-
:O :
:O :
..
..
..
..
(c) : OSe O: (d) : OSe O:
..
.... .. ..
(c)
12. Two resonance structures A and B can be drawn for O3 as shown below.
..
..
O
.. ..
:
:O
: O
O
O :
.. O ..
.. ..
(A)(B)
Which of the following statement is correct?
(a)
There are two