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(CHEM131)[2009](s)midterm~ch_yrx^_10042.pdf
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CHEM 131 Inorganic Chemistry I Mid-term Test Paper (sample)
Part I: Multiple Choice Questions (2 points each, 40 points in total)
1. Which of the following species are hydrogen-like:
++ +
(a) H(b) He(c) He -(d) Li
2. Atoms emit visible and ultraviolet light:
(a)
as electrons jump from lower energy levels to higher levels.

(b)
as the atoms condense from a gas to a liguid.

(c)
as electrons jump from higher energy levels to lower levels.

(d)
as they are heated and the solid melts to form a liquid.

(e)
as the electrons move about the atom within an orbit.


3. A hydrogen atom is electronically considered to be in its excited states
(a)
when its electron occupies the lowest energy level.

(b)
when its electron does not move around.

(c)
when its electron occupies higher energy levels.

(d)
when the atom does not move around.

(e)
when the atom is not heated.


4. How many electronic excited states can an atom have?
(a) 1 (b) 2 (c) 3 (d) 4 (e) none of above
5. The equation E(n) = -Z2 R/n2 is applicable for any kind of atoms
(a) True (b) False
6. 4f and 5f atomic orbitals
(a)
have the same wavefunctions.

(b)
have the same radial wavefunctions.

(c)
have the same numbers of spherical nodes and angular nodes.

(d)
have the same angular wavefunctions.


7. The u and g molecular orbitals of a diatomic molecule correspond to molecular orbitals, respectively.
(a)
bonding and bonding (b) bonding and anti-bonding

(c)
anti-bonding and bonding (d) anti-bonding and anti-bonding


8. Which of the following electron configurations is for Ti3+ (the atomic no. of Ti is 22)?
1 1 22 413
(a) [Ar]3d(b) [Ar]4s(c) [Ar]4s3d(d) [Ar]3d(e) [Ar]4s3d
9. An atom of nickel has unpaired electrons and is . Atomic number of nickel is 28.
(a)
0, diamagnetic (b) 2, diamagnetic (c) 3, paramagnetic

(d)
2, paramagnetic (e) 8, paramagnetic


10. Which statement is false?A sigma molecular orbital
(a)
may result from head-on overlap of p atomic orbitals.

(b)
may result from overlap of an s atomic orbital with a p atomic orbital.

(c)
appears spherical when viewed along its major axis (axis of overlap).

(d)
is a bonding orbital.


11. Which of the following statements are not true?
(a)
The VSEPR model is used to determine the Lewis structures.

(b)
The concept of formal charges is useful in determining the most acceptable Lewis structures.

(c)
The resonance structures are introduced because more than one Lewis structures have to be used to describe the bonding of molecules.

(d)
The octet rule must be obeyed for the period 2 elements.


12. Which molecule has a Lewis structure that does not obey the octet rule?
(a) CO2 (b) ICl (c) PCl3 (d) SiCl4 (e) SF4
13. Which of the following molecule has a dipole moment?
(a) NO3 (b) BF3 (c) PF5 (d) ClO2 (e) SF6
14. The geometry of BrF4-is bes