Basic Chemistry Practice Test: Metals and Metallurgy | Practice Test / Quiz / MCQs

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Basic Chemistry Practice Test: Metals and Metallurgy

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Basic Chemistry Practice Test: Metals and Metallurgy

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1. 12 karat gold contains __________% gold.

10050127525

2. When hydrogen gas is used to reduce an ore (as in a blast furnace), it is converted to __________.

waterhydroxidehydrogen peroxideheliumammonia

3. Roasting HgS in the presence of oxygen produces the free metal and SO₂. What is the coefficient of HgS whenthe equation for this reaction is completed and balanced?

21453

4. Shape memory alloys __________.

are more pliable when cold than when warmchange their structure as the temperature changesall of thesein their higher temperature phase have strong and fixed bonds between atomsin their lower temperature phase have a flexible arrangement between atoms

5. Which one of the following is false concerning the Bayer Process?

In the process, aluminum is converted to a soluble aluminate ion.It is a hydrometallurgical process.It results in the separation of aluminum from iron and silicon.It is used to purify bauxite.It involves treatment of bauxite with cold, dilute sodium hydroxide solution.

6. Which of the following equations represents the roasting of an ore?

2ZnS (s) + 3O2 (g) .. 2ZnO (s) + 2SO2 (g)HgS (s) + O2 (g) .. Hg (g) + SO2 (g)All of these represent roasting processes.PbO (s) + CO (g) .. Pb (l) + CO2 (g)2MoS2 (s) + 7O2 (g) .. 2MoO3 (s) + 4SO2 (g)

7. In the Bayer process, the purpose of filtration after the ore has been digested in concentrated sodium hydroxide is __________.

to separate the insoluble aluminum oxide from the soluble iron impurityto separate the aluminum metal from the hydroxide ionsto remove the anode sludgeto separate the soluble aluminum complex from the insoluble iron impuritiesto remove the sodium ions from the sodium hydroxide solution

8. 18 karat gold contains __________% gold.

89100752518

9. The oxidation state of copper in Cu₂S is __________.

+40+1+2+6

10. Intermetallic compounds are examples of

ionic compounds.homogeneous alloys.heterogeneous alloys.solution alloys.interstitial alloys.

11. Which statement below is true?

The United States has plentiful ore fields of all strategic metals.Most metallic elements are found in the lithosphere in oxidation state zero.There exists little correlation between the abundance of an element in the lithosphere and its commercial extraction and use.New mining techniques and relatively untapped ore fields mean that the environmental impacts of mineral extraction will decrease significantly in the future.The most important commercial class of minerals is the silicates.

12. A mineral is

a transition metal ion.metal in its elemental form.source of carbon.a solid inorganic compound that contains one or more metals.a vitamin.

13. The hydrometallurgical process used in refining gold ore entails converting metallic gold to a water-soluble complex. The formula of the complex is __________.

Au(CN)43-Au(CO)42-Au(CN)2-Au(CO)4+Au(NH3)2+

14. Gold and the platinum group metals are found in nature in metallic form because

they are soluble in water.they are relatively inert.they are solids at room temperature.they are highly reactive.they are relatively abundant.

15. Reaction of iron with which one of the following acids will result in the direct production of Fe3+?

CH3COOHHIHCldilute H2SO4HNO3

16. CuS has a very low solubility in water. However, it will dissolve in nitric acid due to the following reaction. CuS (s) + NO₃- (aq) . Cu₂+ (aq) + S (s) + NO (g) (acidic solution) What is the coefficient of CuS when this equation is balanced?

51342

17. The respective standard oxidation potentials for Cu . Cu₂+, Ni . Ni2+, and Ag . Ag+ are (in V) -0.34, +0.28 and -0.80. Impure copper slabs at the anode are refined electrochemically, affording much purer metallic copper atthe cathode. Which statement below is true?

Ag is oxidized preferentially over Cu, and Ag+ is reduced much less readily than Cu2+, so Ag is separated as Ag+ in the electrolyte solution.Cu is oxidized preferentially over both Ni and Ag, so both Ni and Ag metals are separated as sludges below the anode.Both Ni and Ag are oxidized preferentially over Cu and Ni2+, and Ag+ is reduced much less readily than Cu2+, so Ni and Ag are separated as Ni2+ and Ag+ in the electrolyte solution.Ag is oxidized preferentially over Cu, and Ag+ is reduced much more readily than Cu2+, so Ag plates out with Cu at the cathode and cannot readily be removed from impure copper.Ni is oxidized preferentially over Cu, and Ni2+ is reduced much less readily than Cu2+, so Ni is separated as Ni2+ in the electrolyte solution.

18. Which mineral contains aluminum?

magnetitebauxitegalenacinnabarmalachite

19. The first step in the production of nickel from its ore, NiS, is to roast it in the presence of oxygen to form the metal oxide and SO₂. What is the coefficient of oxygen when the equation for this reaction is completed and balanced?

21435

20. Smelting is

heating an ore to make it react with a gas in a furnace.addition of calcium to a molten ore.thermal decomposition of an ore with elimination of a gaseous product.cooling a molten metal to make it solidify.melting and subsequent reaction of molten ores resulting in the formation of layers.

21. The transition metals in group __________ have the highest melting points.

3B6B2B8B4B

22. Why do aqueous solutions of Cr₂+ usually appear violet instead of blue?

Water usually contains enough chloride ion to form a complex ion containing chloride and that substance is violet-colored.Chromium(II) rapidly forms a complex ion with water and that ion is violet-colored.Chromium(II) is rapidly oxidized to chromium(III) by atmospheric oxygen.The intensity of the color is so low it appears violet instead of blue.Chromium(II) reacts with water to form a hydroxide-containing complex ion that is violet-colored.

23. What happens to the silicon that is a contaminant in crude iron in a converter?

It is precipitated as iron silicate.it is converted to the tetrafluoride that bubbles out as a gas.It is precipitated as sodium silicate.It is precipitated as the carbide.It is converted to silicon dioxide and becomes part of the slag.

24. Anhydrous aluminum oxide is dissolved in molten cryolite rather than simply melted because __________

the melting point of pure, anhydrous aluminum oxide is too high.in pure, molten Al2O3, the aluminum would be oxidized rather than reduced.the cryolite provides a source of sodium ions.the cryolite actually provides the aluminum that is to be reduced.the cryolite provides the necessary fluoride ions.

25. For a substitutional alloy to form, the two metals combined must have similar

reduction potential and size.ionization potential and electron affinity.number of valance electrons and electronegativity.atomic radii and chemical bonding properties.band gap and reactivity.

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