| Metallurgy
Examples of Multiple Choice Questions
|
These questions have been taken from exams given in previous years.
They roughly cover the material in the order presented in the textbook.
Note: The subscripts and superscripts may not appear as such. It depends upon your web browser.
- 1.
- Some metals are
found in the uncombined free state while other metals are found in the
combined state. What is a deciding factor?
- (a) Metals with negative reduction potentials can occur in
the free state while metals with positive reduction potentials occur in
the combined state.
- (b) The active metals can occur in the free state while the less active metals occur in the combined state.
- (c) Metals with positive reduction potentials can occur in the
free state while metals with negative reduction potentials can occur in
the combined state.
- (d) There is no way we can predict which metals will be free or combined.
- (e) none of the above
- 2.
- Soluble metal compounds tend to be found in the _____, whereas insoluble metal compounds tend to be found in the _____ .
- (a) oceans; earth's crust
- (b) earth's crust; oceans
- (c) salt beds; oceans
- (d) oceans; salt beds
- (e) rivers; oceans
- 3.
- In the process known as 'roasting,' a(n) _____ is chemically converted to a(n) _____.
- (a) sulfide; oxide
- (b) carbonate; oxide
- (c) hydroxide; oxide
- (d) oxide; sulfate
- (e) phosphate; phosphide
- 4.
- Which metal can be found as the free element?
- (a) Na
- (b) Mn
- (c) Fe
- (d) Cr
- (e) Pt
- 5.
- The Hall-Heroult process is used in the production of:
- (a) Mg
- (b) Fe
- (c) Al
- (d) Au
- (e) Cu
- 6.
- How much magnesium can be obtained from one pound of seawater if the concentration
of Mg2+ is 0.13 weight percent? Assume 100% recovery.
- (a) 1.7 grams
- (b) 1.3 grams
- (c) 0.35 grams
- (d) 0.59 grams
- (e) 2.5 grams
- 7.
- For every 100 pounds of iron ore there are 27.8 pounds of magnetite, Fe3O4. What is the weight percent iron in this ore?
- (a) 72.3%
- (b) 20.1%
- (c) 27.8%
- (d) 16.7%
- (e) 23.1%
- 8.
- A reaction sequence for the reduction of one of the iron ores is as follows:
2 C(coke) + O2 2 CO
Fe2O3 + 3 CO 2 Fe + 3 CO2
Calculate the amount of coke necessary to produce 800 g of Fe.
- (a) 114 g
- (b) 1030 g
- (c) 258 g
- (d) 172 g
- (e) 544 g
- 9.
- What is the charge on the copper ion in the mineral azurite, Cu3(CO3)2(OH)2?
- (a) 2+
- (b) 1+
- (c) 0
- (d) 1-
- (e) 2-
- 10.
- How
many coulombs of electricity are required to produce one metric ton
(1000 kg) of magnesium? There are 96,500 coulombs in one faraday.
MgCl2 Mg(l) + Cl2
- (a) 4.0 x 109 coulombs
- (b) 2.0 x 109 coulombs
- (c) 7.9 x 109 coulombs
- (d) 1.2 x 1012 coulombs
- (e) 5.3 x 108 coulombs
Answers:
1. (c) 2. (a) 3. (a) 4. (e) 5. (c) 6. (d) 7. (b) 8. (c) 9. (a) 10. (c)
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To report any corrections, please e-mail Dr. Wendy Keeney-Kennicutt.