Mc Metals Alloys
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Multiple Choice Questions : Metals and Alloys
1988 6.
1985 1.
A. B. C. D.
Which of the following carbonates would give the metal when heated with carbon? (1) MgCO3 (2) PbCO3
(2) only (1) and (3) only (2) and (4) only (1), (2) and (4) only
Which of the following will occur when a piece of magnesium ribbon is added to very dilute nitric acid?
8.
A. H+(aq) + OH-(aq) → H2O() B. 2H+(aq) + 2e- → H2(g) C. NO3-(aq) + 4H+(aq) + 3e- → NO(g) + 2H2O() D. NO3-(aq) + 2H+(aq) + e- → NO2(g) + H2O() 3.
Which of the following metals will NOT displace copper ions from aqueous copper(II) sulphate? A. B. C. D.
4.
Which of the following compounds does NOT form a solid oxide when heated strongly? A. B. C. D.
5.
silver iron zinc aluminium
copper(II) sulphate lead(II) carbonate potassium nitrate calcium hydroxide
Dipping aluminium foil into nitric acid for a brief period can protect the metal from corrosion. An oxide layer is formed on the surface of the aluminium foil when it is dipped into nitric acid
A metal X displaces copper from copper(II) sulphate solution but does not displace zinc sulphate solution. Which of the following represents an increasing order for the reducing power of the three metals? A. B. C. D.
1986 2.
CuO MgO Fe2O3 Al2O3
(3) K2CO3 (4) CuCO3 7.
A. B. C. D.
Which of the following oxides dissolves in both dilute sulphuric acid and sodium hydroxide solution?
Cu < X< Zn X < Cu< Zn Zn < X< Cu Zn < Cu < X
When a coin containing 92 % silver and 8 % copper is warmed with excess concentrated nitric acid it forms A. a colourless solution B. a pale blue solution C. a colourless solution with some undissolved copper. D. A pale blue solution with some undissolved silver.
9.
Which of the following metal oxides can be reduced by carbon? (l) magnesium oxide (2) iron(III) oxide (3) copper(lI) oxide A. B. C. D.
(1) and (2) only (1) and (3) only (2) and (3) only (l), (2) and (3)
10. When malachite [CuCO3.Cu(OH)2] is strongly heated in air, which of the following changes would occur? (1) Carbon dioxide is evolved. (2) Steam is evolved. (3) Metallic copper is produced. A. B. C. D.
(1) only (1) and (2) only (2) and (3) only (1), (2) and (3)
MC : Metals and Alloys
Page 2
1989 11. Which of the following metals can obtain hydrogen from both dilute hydrochloric acid and dilute sodium hydroxide solution? A. B. C. D.
aluminium iron lead magnesium
12. When zinc reacts with 1 M nitric acid, hydrogen is not evolved. This is because A. zinc reduces the nitric acid to nitrogen. B. the concentration of hydrogen ions in dilute nitric acid is very low. C. nitric acid is an oxidizing agent. D. zinc forms a protective oxide layer. 13. When a colourless solution X is added to sodium chloride solution, a white precipitate is produced which dissolves in aqueous ammonia. When excess dilute nitric acid is added to the resulting solution, the white precipitate appears again. Which of the following ions would probably be present in solution X? A. B. C. D.
Ag+(aq) Pb2+(aq) Zn2+(aq) Al3+(aq)
14. Which of the following metal oxides, when heated on a charcoal block, can be reduced to the corresponding metals? (1) CuO (2) PbO (3) ZnO A. B. C. D.
(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)
15. Which of the following processes could be used to slow down corrosion of an iron nail? (1) (2) (3) (4)
painting the nail coating a layer of zinc on the nail wrapping a strip of copper around the nail putting the nail under distilled water
A. (1) and (2) only B. (1) and (3) only C. (2) and (4) only D. (1), (3) and (4) only 16. Which of the following nitrates would give off brown fumes when heated?
(1) NaNO3 (2) AgNO3 (3) Pb(NO3)2 A. B. C. D.
(1) and (3) only (2) and (3) only (1) and (2) only (1), (2) and (3)
1990 17. Which of the following pairs of substances would react to produce hydrogen? (1) iron and steam (2) sodium and ethanol (3) magnesium and concentrated sulphuric acid A. B. C. D.
(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)
18. Magnesium chloride solution gives a white precipitate with lead(II) nitrate solution. Magnesium is higher than lead in the metal activity series. 19. Sea water can corrode ships more quickly than fresh water. Sodium chloride in sea water speeds up the corrosion of iron.
1991 20. X, Y and Z are metals. Y can displace X from a solution of the nitrate X. Oxides of X and Y can be reduced by hydrogen but not the oxide of Z. Which of the following arrangements represents the correct descending order of reactivity of the metals? A. B. C. D.
Z>Y>X X>Y>Z Z>X>Y X>Z>Y
1992
MC : Metals and Alloys
Page 3
Directions: The two questions below refer to the following diagrams:
Directions: The two questions below refer to the following experiment:
21. Which of the following represents the correct order of activity of the metals P, Q, R and S?
Three different pairs of metal wires are placed separately in petri dishes (as shown in the diagram above) containing a mixture of gelatin, potassium hexacyanoferrate(III) solution and phenolphthalein solution.
A. B. C. D.
25. Which of the following statements are correct?
R, P, Q, S Q, P, R, S P, Q, S, R P, R, S, Q
(1) The iron wire in Dish I does not corrode readily. (2) The iron wire in Dish II corrodes readily. (3) The iron wires in Dish III do not corrode.
22. Which of the two metals used as electrodes would give the largest cell voltage? A. B. C. D.
Q and R Q and S S and R S and P
In the above experiment, a gas is evolved and burns at the jet. Metal X is probably zinc. aluminium. magnesium. copper
A. B. C. D.
iron wire pink blue pink blue
copper wire blue pink no colour no colour
1994 *27. Which of the following methods can be used to distinguish between solid sodium carbonate and solid calcium carbonate?
24. Which of the following metals can be obtained by reducing their oxides with carbon? (1) iron (2) calcium (3) lead A. B. C. D.
(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)
26. In Dish II, which of the following colours will develop around the iron wire and the copper wire?
23.
A. B. C. D.
A. B. C. D.
(1) and (2) only (1) and (3) orily (2) and (3) only (1), (2) and (3)
1993
(1) heating the solid and testing the gaseous product with lime water (2) testing the solubility of the solid in water (3) conducting a flame test on the solid A. B. C. D.
(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)
1995
MC : Metals and Alloys
28. Which of the following methods can be used to extract lead from lead(II) oxide? A. heating lead(II) oxide in the absence of air B. heating lead(II) oxide in the presence of air C. heating lead(II) oxide with copper at high temperature D. heating lead(II) oxide with carbon at high temperature
Page 4
31. Metal X reacts with dilute hydrochloric acid to liberate hydrogen, but metal Y and Z have no reaction with the dilute acid. The oxide of metal Y decomposes on heating but the oxide of metal Z does not. Which of the following arrangements represents the order of increasing reactivity of the three metals? A. B. C. D.
X
29. A certain amount of silver oxide is heated in a test tube. Which of the following graphs represents the correct plot of the mass of the contents of the test tube against time? A.
1996 32. Zinc blocks are often attached to the steel legs of off-shore oil platforms because A. zinc can protect steel from corrosion. B. zinc is more resistant to corrosion than steel. C. zinc is harder than steel. D. zinc does not react with crude oil.
B.
33. Which of the following metals is/are present in solder? (1) copper (2) lead (3) iron
C.
A. B. C. D.
(1) only (2) only (1) and (3) only (2) and (3) only
34. The resistance of aluminium to corrosion can be enhanced by anodisation. D.
During anodisation, aluminium oxide on the metal surface is reduced to aluminium.
1997 35. Which of the following metal oxides can be reduced to the metal when heated with carbon? 30. When a piece of iron wire coupled with a piece of tin wire is left in the air for a long period of time, the iron wire does not corrode. Tin prevents iron from corrosion by sacrificial protection.
(1) aluminium oxide (2) lead(II) oxide (3) iron(III) oxide A. (1) only B. (2) only C. (1) and (3) only
MC : Metals and Alloys
Page 5
D. (2) and (3) only 36. Aluminium is used to make window frames because
D. zinc nitrate 41. In each of the four solutions shown below, a strip of zinc is added.
(1) it is strong. (2) it can resist corrosion. (3) it is the most abundant metallic element in the earth crust. Which of the above statements are correct? A. B. C. D.
(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)
s ilv e r n itra te s o lu tio n
le a d ( I I ) n itra te s o lu tio n
z in c
z in c T u b e II
Tube I
37. The reaction of sodium with water produces hydrogen. The reaction of sodium with water is exothermic.
m a g n e s iu m s u lp h a te s o lu tio n
c o p p e r(II) s u lp h a te s o lu tio n
z in c
z in c
T u b e III
T u b e IV
Which of the following combinations is correct? 38. The body of a motor car will corrode faster if common salt is sprinkled on roads after a heavy snow. Common salt and water form a conducting solution.
A. B. C. D.
Tube I II III IV
Observation no change brown coating on zinc no change grey coating on zinc
42. Brass is commonly used for making ornaments because
1998 39. Consider the following experiment. m e ta l X s te a m
(1) it has an attractive appearance. (2) it can resist corrosion. (3) it is softer than copper. Which of the following combinations is correct?
H EAT
d e liv e ry tu b e
During the experiment, a gas is liberated. The gas can burn at the end of the delivery tube. X is probably A. B. C. D.
copper lead silver zinc
40. Which of the following is NOT the appropriate substance for preparing zinc sulphate by directly mixing with dilute sulphuric acid? A. zinc B. zinc carbonate C. zinc hydroxide
A. B. C. D.
(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)
1999 43. In which of the following situation is iron prevented from rusting by sacrificial protection? A. Iron plates are joined together with copper rivets. B. Iron pipes are connected to lead blocks. C. Iron sheets are plated with zinc. D. Iron cans are coated with tin.
MC : Metals and Alloys
Page 6
44. Which of the following metal oxides CANNOT be reduced by heating with carbon? (1) magnesium oxide (2) lead(II) oxide (3) iron(III) oxide A. B. C. D.
(1) only (2) only (1) and (3) only (2) and (3) only
45. Which of the following reactions will occur when aluminium powder is added to silver nitrate solution? (1) displacement (2) anodization (3) redox A. B. C. D.
(1) only (2) only (1) and (3) only (2) and (3) only
49. Gold ornaments are usually made from an alloy of gold and copper instead of pure gold. This is because the alloy A. B. C. D.
can be found free in nature. is more corrosion resistant than pure gold. is denser than pure gold. is stronger than pure gold.
50. In an experiment, a piece of calcium metal was added to a beaker of water. Which of the following of the statements concerning the experiment is/are correct? (1) The calcium metal sank to the bottom of the beaker. (2) The calcium metal burnt with a brick red flame. (3) At the end of the experiment, an alkaline solution was formed in the beaker. A. B. C. D.
(1) only (2) only (1) and (3) only (2) and (3) only
46. Metals have good thermal conductivity. Metals are composed of giant lattices of positive ions surrounded by valence electrons which are free to move throughout the lattices.
2000 47. Caesium (Cs) is a Group I element in the Periodic Table and its relative atomic mass is greater than that of potassium. Which of the following statements concerning caesium is INCORRECT? A. Caesium is a weaker reducing agent than potassium. B. Caesium reacts violently with water. C. Caesium is a soft metal. D. Caesium reacts with oxygen to form an oxide with formula Cs2O. 48. Iron cans used for canning food are usually coated with tin instead of zinc. This is because A. tin is more reactive than zinc. B. tin ions are non-toxic but zinc ions are toxic. C. tin forms an alloy with iron and this alloy is corrosion resistant. D. tin prevents iron cans from rusting by sacrificial protection.
51. Aluminium was used earlier than iron in the history of mankind. Aluminium is more abundant than iron in the earth crust.
1988 6.
1985 1.
A. B. C. D.
Which of the following carbonates would give the metal when heated with carbon? (1) MgCO3 (2) PbCO3
(2) only (1) and (3) only (2) and (4) only (1), (2) and (4) only
Which of the following will occur when a piece of magnesium ribbon is added to very dilute nitric acid?
8.
A. H+(aq) + OH-(aq) → H2O() B. 2H+(aq) + 2e- → H2(g) C. NO3-(aq) + 4H+(aq) + 3e- → NO(g) + 2H2O() D. NO3-(aq) + 2H+(aq) + e- → NO2(g) + H2O() 3.
Which of the following metals will NOT displace copper ions from aqueous copper(II) sulphate? A. B. C. D.
4.
Which of the following compounds does NOT form a solid oxide when heated strongly? A. B. C. D.
5.
silver iron zinc aluminium
copper(II) sulphate lead(II) carbonate potassium nitrate calcium hydroxide
Dipping aluminium foil into nitric acid for a brief period can protect the metal from corrosion. An oxide layer is formed on the surface of the aluminium foil when it is dipped into nitric acid
A metal X displaces copper from copper(II) sulphate solution but does not displace zinc sulphate solution. Which of the following represents an increasing order for the reducing power of the three metals? A. B. C. D.
1986 2.
CuO MgO Fe2O3 Al2O3
(3) K2CO3 (4) CuCO3 7.
A. B. C. D.
Which of the following oxides dissolves in both dilute sulphuric acid and sodium hydroxide solution?
Cu < X< Zn X < Cu< Zn Zn < X< Cu Zn < Cu < X
When a coin containing 92 % silver and 8 % copper is warmed with excess concentrated nitric acid it forms A. a colourless solution B. a pale blue solution C. a colourless solution with some undissolved copper. D. A pale blue solution with some undissolved silver.
9.
Which of the following metal oxides can be reduced by carbon? (l) magnesium oxide (2) iron(III) oxide (3) copper(lI) oxide A. B. C. D.
(1) and (2) only (1) and (3) only (2) and (3) only (l), (2) and (3)
10. When malachite [CuCO3.Cu(OH)2] is strongly heated in air, which of the following changes would occur? (1) Carbon dioxide is evolved. (2) Steam is evolved. (3) Metallic copper is produced. A. B. C. D.
(1) only (1) and (2) only (2) and (3) only (1), (2) and (3)
MC : Metals and Alloys
Page 2
1989 11. Which of the following metals can obtain hydrogen from both dilute hydrochloric acid and dilute sodium hydroxide solution? A. B. C. D.
aluminium iron lead magnesium
12. When zinc reacts with 1 M nitric acid, hydrogen is not evolved. This is because A. zinc reduces the nitric acid to nitrogen. B. the concentration of hydrogen ions in dilute nitric acid is very low. C. nitric acid is an oxidizing agent. D. zinc forms a protective oxide layer. 13. When a colourless solution X is added to sodium chloride solution, a white precipitate is produced which dissolves in aqueous ammonia. When excess dilute nitric acid is added to the resulting solution, the white precipitate appears again. Which of the following ions would probably be present in solution X? A. B. C. D.
Ag+(aq) Pb2+(aq) Zn2+(aq) Al3+(aq)
14. Which of the following metal oxides, when heated on a charcoal block, can be reduced to the corresponding metals? (1) CuO (2) PbO (3) ZnO A. B. C. D.
(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)
15. Which of the following processes could be used to slow down corrosion of an iron nail? (1) (2) (3) (4)
painting the nail coating a layer of zinc on the nail wrapping a strip of copper around the nail putting the nail under distilled water
A. (1) and (2) only B. (1) and (3) only C. (2) and (4) only D. (1), (3) and (4) only 16. Which of the following nitrates would give off brown fumes when heated?
(1) NaNO3 (2) AgNO3 (3) Pb(NO3)2 A. B. C. D.
(1) and (3) only (2) and (3) only (1) and (2) only (1), (2) and (3)
1990 17. Which of the following pairs of substances would react to produce hydrogen? (1) iron and steam (2) sodium and ethanol (3) magnesium and concentrated sulphuric acid A. B. C. D.
(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)
18. Magnesium chloride solution gives a white precipitate with lead(II) nitrate solution. Magnesium is higher than lead in the metal activity series. 19. Sea water can corrode ships more quickly than fresh water. Sodium chloride in sea water speeds up the corrosion of iron.
1991 20. X, Y and Z are metals. Y can displace X from a solution of the nitrate X. Oxides of X and Y can be reduced by hydrogen but not the oxide of Z. Which of the following arrangements represents the correct descending order of reactivity of the metals? A. B. C. D.
Z>Y>X X>Y>Z Z>X>Y X>Z>Y
1992
MC : Metals and Alloys
Page 3
Directions: The two questions below refer to the following diagrams:
Directions: The two questions below refer to the following experiment:
21. Which of the following represents the correct order of activity of the metals P, Q, R and S?
Three different pairs of metal wires are placed separately in petri dishes (as shown in the diagram above) containing a mixture of gelatin, potassium hexacyanoferrate(III) solution and phenolphthalein solution.
A. B. C. D.
25. Which of the following statements are correct?
R, P, Q, S Q, P, R, S P, Q, S, R P, R, S, Q
(1) The iron wire in Dish I does not corrode readily. (2) The iron wire in Dish II corrodes readily. (3) The iron wires in Dish III do not corrode.
22. Which of the two metals used as electrodes would give the largest cell voltage? A. B. C. D.
Q and R Q and S S and R S and P
In the above experiment, a gas is evolved and burns at the jet. Metal X is probably zinc. aluminium. magnesium. copper
A. B. C. D.
iron wire pink blue pink blue
copper wire blue pink no colour no colour
1994 *27. Which of the following methods can be used to distinguish between solid sodium carbonate and solid calcium carbonate?
24. Which of the following metals can be obtained by reducing their oxides with carbon? (1) iron (2) calcium (3) lead A. B. C. D.
(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)
26. In Dish II, which of the following colours will develop around the iron wire and the copper wire?
23.
A. B. C. D.
A. B. C. D.
(1) and (2) only (1) and (3) orily (2) and (3) only (1), (2) and (3)
1993
(1) heating the solid and testing the gaseous product with lime water (2) testing the solubility of the solid in water (3) conducting a flame test on the solid A. B. C. D.
(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)
1995
MC : Metals and Alloys
28. Which of the following methods can be used to extract lead from lead(II) oxide? A. heating lead(II) oxide in the absence of air B. heating lead(II) oxide in the presence of air C. heating lead(II) oxide with copper at high temperature D. heating lead(II) oxide with carbon at high temperature
Page 4
31. Metal X reacts with dilute hydrochloric acid to liberate hydrogen, but metal Y and Z have no reaction with the dilute acid. The oxide of metal Y decomposes on heating but the oxide of metal Z does not. Which of the following arrangements represents the order of increasing reactivity of the three metals? A. B. C. D.
X
29. A certain amount of silver oxide is heated in a test tube. Which of the following graphs represents the correct plot of the mass of the contents of the test tube against time? A.
1996 32. Zinc blocks are often attached to the steel legs of off-shore oil platforms because A. zinc can protect steel from corrosion. B. zinc is more resistant to corrosion than steel. C. zinc is harder than steel. D. zinc does not react with crude oil.
B.
33. Which of the following metals is/are present in solder? (1) copper (2) lead (3) iron
C.
A. B. C. D.
(1) only (2) only (1) and (3) only (2) and (3) only
34. The resistance of aluminium to corrosion can be enhanced by anodisation. D.
During anodisation, aluminium oxide on the metal surface is reduced to aluminium.
1997 35. Which of the following metal oxides can be reduced to the metal when heated with carbon? 30. When a piece of iron wire coupled with a piece of tin wire is left in the air for a long period of time, the iron wire does not corrode. Tin prevents iron from corrosion by sacrificial protection.
(1) aluminium oxide (2) lead(II) oxide (3) iron(III) oxide A. (1) only B. (2) only C. (1) and (3) only
MC : Metals and Alloys
Page 5
D. (2) and (3) only 36. Aluminium is used to make window frames because
D. zinc nitrate 41. In each of the four solutions shown below, a strip of zinc is added.
(1) it is strong. (2) it can resist corrosion. (3) it is the most abundant metallic element in the earth crust. Which of the above statements are correct? A. B. C. D.
(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)
s ilv e r n itra te s o lu tio n
le a d ( I I ) n itra te s o lu tio n
z in c
z in c T u b e II
Tube I
37. The reaction of sodium with water produces hydrogen. The reaction of sodium with water is exothermic.
m a g n e s iu m s u lp h a te s o lu tio n
c o p p e r(II) s u lp h a te s o lu tio n
z in c
z in c
T u b e III
T u b e IV
Which of the following combinations is correct? 38. The body of a motor car will corrode faster if common salt is sprinkled on roads after a heavy snow. Common salt and water form a conducting solution.
A. B. C. D.
Tube I II III IV
Observation no change brown coating on zinc no change grey coating on zinc
42. Brass is commonly used for making ornaments because
1998 39. Consider the following experiment. m e ta l X s te a m
(1) it has an attractive appearance. (2) it can resist corrosion. (3) it is softer than copper. Which of the following combinations is correct?
H EAT
d e liv e ry tu b e
During the experiment, a gas is liberated. The gas can burn at the end of the delivery tube. X is probably A. B. C. D.
copper lead silver zinc
40. Which of the following is NOT the appropriate substance for preparing zinc sulphate by directly mixing with dilute sulphuric acid? A. zinc B. zinc carbonate C. zinc hydroxide
A. B. C. D.
(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)
1999 43. In which of the following situation is iron prevented from rusting by sacrificial protection? A. Iron plates are joined together with copper rivets. B. Iron pipes are connected to lead blocks. C. Iron sheets are plated with zinc. D. Iron cans are coated with tin.
MC : Metals and Alloys
Page 6
44. Which of the following metal oxides CANNOT be reduced by heating with carbon? (1) magnesium oxide (2) lead(II) oxide (3) iron(III) oxide A. B. C. D.
(1) only (2) only (1) and (3) only (2) and (3) only
45. Which of the following reactions will occur when aluminium powder is added to silver nitrate solution? (1) displacement (2) anodization (3) redox A. B. C. D.
(1) only (2) only (1) and (3) only (2) and (3) only
49. Gold ornaments are usually made from an alloy of gold and copper instead of pure gold. This is because the alloy A. B. C. D.
can be found free in nature. is more corrosion resistant than pure gold. is denser than pure gold. is stronger than pure gold.
50. In an experiment, a piece of calcium metal was added to a beaker of water. Which of the following of the statements concerning the experiment is/are correct? (1) The calcium metal sank to the bottom of the beaker. (2) The calcium metal burnt with a brick red flame. (3) At the end of the experiment, an alkaline solution was formed in the beaker. A. B. C. D.
(1) only (2) only (1) and (3) only (2) and (3) only
46. Metals have good thermal conductivity. Metals are composed of giant lattices of positive ions surrounded by valence electrons which are free to move throughout the lattices.
2000 47. Caesium (Cs) is a Group I element in the Periodic Table and its relative atomic mass is greater than that of potassium. Which of the following statements concerning caesium is INCORRECT? A. Caesium is a weaker reducing agent than potassium. B. Caesium reacts violently with water. C. Caesium is a soft metal. D. Caesium reacts with oxygen to form an oxide with formula Cs2O. 48. Iron cans used for canning food are usually coated with tin instead of zinc. This is because A. tin is more reactive than zinc. B. tin ions are non-toxic but zinc ions are toxic. C. tin forms an alloy with iron and this alloy is corrosion resistant. D. tin prevents iron cans from rusting by sacrificial protection.
51. Aluminium was used earlier than iron in the history of mankind. Aluminium is more abundant than iron in the earth crust.
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