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(CHEM100)[2010](s)midterm~id-^_10033.pdf
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Sample (Mid-term Test) Paper for Chem 100 <<General Chemistry>>
Multiple choices (2 marks each, 40 marks in total)
1. A sulfide ion, S2-, has
(a)
16 protons and 16 electrons (b) 32 protons and 16 electrons

(c)
16 protons and 14 electrons (d) 16 protons and 18 electrons

(e)
32 protons and 18 electrons


2. To describe an atomic orbital, how many quantum numbers are required?
(a) 4 (b) 3 (c) 2 (d) 1 (e) none of the above
3. An electron in a certain atom is in the n=2 quantum level. Which choice lists possible values of both l and m that it can have?
(a) l=2 m=2 (b) l=1 m=2 (c) l=0 m=-1 (d) l=0 m=0 (e) l=2 m=1
4. An atom of manganese has unpaired electrons and is . Atomic number of manganese is 25.
(a)
0, diamagnetic (b) 2, diamagnetic (c) 3, paramagnetic

(d)
5, paramagnetic (e) 7, paramagnetic


5. Consider an element with an electron configuration of [Kr]5s24d105p5. How would you classify this element?
(a)
a representative element (b) a transition metal (c) an alkali metal

(d)
an actinide element (e) a noble gas


6. The electron configuration of a Co3+ ion is: The atomic number of Co is 27.
5 15 24
(a)
[Ar]3d(b) [Ar]4s3d(c) [Ar]4s3d

(d)
[Ar]3d6 (e) [Ar]4s23d9


7. Which element will display an unusually large jump in ionization energy values
rd th
between I4 and I5, the 4and 5ionization energies?
(a)Na (b)P (c)Al (d)Si (e)S
8. Which of the following statements is true?
(a)
The radii of ions are always smaller than the radii of the corresponding atoms of the same element.

(b)
The electron configuration of the outermost electrons of atoms of the halogens is


27
ns np .
(c)
An electron in a 3p orbital could have a value of 2 for its angular momentum quantum number l.

(d)
Each shell of quantum number n contains n subshells.


9. Each of the three resonance structures of NO3-has how many lone-pairs of electrons?
(a)7 (b)8 (c)9 (d)10 (e)13
10. Which molecule has a Lewis structure that does not obey the octet rule?
(a) N2O (b) CS2 (c) PH3 (d) SiCl4 (e) NO2
11. Which of the following molecule is polar

(a) NO3 (b) CO2 (c) PF5 (d) ClO3 (e) BeCl2
+
12. The geometry of BrF4 is best described as:
(a) tetrahedral (b) trigonal pyramidal (c) a see-saw structure
(d) square planar (e) none of above

13. What is the hybridization on the central atom in ClO3-
23 332
(a)sp (b)sp(c)sp(d)spd (e)spd
14. Complete the sentence. The XeO4 molecule has:
(a)
nonpolar bonds, and is a nonpolar molecule.

(b)
nonpolar bonds, but is a polar molecule.

(c)
polar bonds, and is a polar molecule.

(d)
polar bonds, but is a nonpolar molecule.

(e)
none of above


15. In the coordination compound [Cr(NH3)2(en)Cl2]Br2, where en = ethylenediamine, the coordination number (C.N.) and oxidation number (O.N.) of the metal atom, respectively are: (The atomic number of Cr is 24)
(a)
C.N.=6; O.N.=4 (b) C.N.=6;