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Question Bank No: 1

1. In the commercial electrochemical process for aluminium extraction the electrolyte used is

a)		Al ${(OH)}_{3}$ in NaOH solution
b)		An aqueous solution of ${Al}_{2} ({SO}_{4})_{3}$
c)		A molten mixture of ${Al}_{2} O_{3}$ and N $a_{3} Al F_{6}$
d)		A molten mixture of ${Al}_{2} O_{3}$ and Al ${(OH)}_{3}$

2. Use of electrolysis is

a)		Electroplating
b)		Electro refining
c)		Both a and b
d)		None of these

3. In Goldschmidt aluminothermic process, reducing agent used is

a)		Coke
b)		Al powder
c)		Na
d)		Ca

4. In blast furnace, maximum temperature is in

a)		Zone of fusion
b)		Zone of combustion
c)		Zone of slag combustion
d)		Zone of reduction

5. Which of the following beneficiation process is used for the mineral ${Al}_{2} O_{3}$ 2 $H_{2}$ O?

a)		Froth floatation
b)		Leaching
c)		Liquation
d)		Magnetic separation

6. Zone refining process is used for the

a)		concentration of an ore
b)		Reduction of a metal oxide
c)		Purification of metals
d)		Purification of ore

7. The purpose of smelting an ore is to

a)		Reduce it
b)		Oxidise it
c)		Separate volatile impurities
d)		Obtain an alloy

8. In the froth floatation process for the purification of ores, the ore particles float because

a)		They are light
b)		Their surface is hydrophobic i.e. not easily wetted by water
c)		They bear electrostatic charge
d)		They are insoluble

9. Which of the following metal is obtained by leaching its ore with dilute cyanide solution?

a)		Silver
b)		Titanium
c)		Vanadium
d)		Zinc

10. Which of the following metals cannot be extracted by carbon process?

a)		Pb
b)		Al
c)		Hg
d)		Zn

11. Heating of pyrites in air for oxidation of sulphur is called

a)		Roasting
b)		Smelting
c)		calcination
d)		Slagging

12. Cupellation is used in the metallurgy of

a)		Cu
b)		Ag
c)		Zn
d)		Al

13. The process of converting hydrated alumina into anhydrous alumina is called

a)		Roasting
b)		Smelting
c)		Dressing
d)		Calcination

14. The most abundant element in the earth's crust (by weight) is

a)		Si
b)		Al
c)		O
d)		Fe

15. Nickel is purified by thermal decomposition of its

a)		Hydride
b)		Chloride
c)		Azide
d)		Carbonyl

16. Flux is used to

a)		Remove all impurities from ores
b)		Reduce metal oxide
c)		Remove silica
d)		Remove silica and undesirable metal oxide

17. Heating of ore in the absence of air below its melting point is called

a)		Leaching
b)		Roasting
c)		Smelting
d)		Calcination

18. Aluminothermic process is used for metallurgy of

a)		Pb
b)		Ag
c)		Al
d)		None of these

19. The extraction of which of the following metals involves bessemerisation ?

a)		Fe
b)		Ag
c)		Al
d)		Cu

20. The slag obtained during the extraction of copper pyrites is composed mainly of

a)		${Cu}_{2} S$
b)		${FeSiO}_{3}$
c)		${CuSiO}_{3}$
d)		${SiO}_{2}$

21. Van Arkel method of purification of metals involve converting the metal to a

a)		Volatile stable compound
b)		Volatile unstable compound
c)		Non -Volatile stable compound
d)		None of the above

22. Which is not basic flux?

a)		${CaCO}_{3}$
b)		lime
c)		${SiO}_{2}$
d)		CaO

23. Electrolytic reduction method is used in extraction of

a)		Highly electronegative elements
b)		Highly electropositive elements
c)		Transition metals
d)		Noble metals

24. Among the following groups of oxides, the group that cannot be reduced by carbon to give the respective metal is

a)		${Cu}_{2} O, {SnO}_{2}$
b)		${Fe}_{2} O_{3}, ZnO$
c)		$CaO, K_{2} O$
d)		$PbO, {Fe}_{3} O_{4}$

25. A naturally occurring substance from which a metal can be profitably extracted is known as

a)		Mineral
b)		Gangue
c)		Ore
d)		Flux

26. Cassiterite is an ore of

a)		Mn
b)		Ni
c)		Sb
d)		Sn

27. The most abundant metal on the surface of the earth is

a)		Fe
b)		Al
c)		Ca
d)		Na

28. A basic lining is given to a furnace by using

a)		calcinied dolomite
b)		lime stone
c)		haemalite
d)		silica

29. The process of zone refining is used in the purification of

a)		Si
b)		Al
c)		Ag
d)		Cu

30. In elctrorefining of copper some gold is deposited as

a)		anode mud
b)		cathode mud
c)		cathode
d)		electrolyte

31. Which one of the following beneficiation processes is used for the mineral, ${Al}_{2} O_{3} . {2 H}_{2} O$ ?

a)		froth floatation
b)		leaching
c)		liquation
d)		magnetic seperation

32. Zone refining is a method to obtain

a)		very high temperature
b)		ultra pure Al
c)		ultra pure metals
d)		ultra pure oxides

33. In the forth floatation process for the purification of ores, the ore particles float because

a)		they are light
b)		their surface is hydrophobic i.e, not easily wetted by water
c)		they bear electrostatic charge
d)		they are insoluble

34. Which one of the following metals is extracted by thermal reduction process?

a)		copper
b)		iron
c)		aluminium
d)		magnesium

35. One of the following metals forms a volatile compound and this property is taken advantage for its extraction. This metal is

a)		Iron
b)		Nickel
c)		cobalt
d)		Tungsten