85 Q.51 Which of the following carbonates would give the metal when heated with carbon? (1) MgCO 3 (2) PbCO 3 (3) K 2 CO 3 (4) CuCO 3

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1 Metal and metal reactivity / Section 2 / Sect2pp.doc / S. W. Tse / P.1 85 Q.51 Which of the following carbonates would give the metal when heated with carbon? (1) MgCO 3 (2) PbCO 3 (3) K 2 CO 3 (4) CuCO 3 A. (2) only B. (1) and (3) only C. (2) and (4) only D. (1), (2) and (4) only 86 Q.31 A salt X dissolves readily in water to form a colourless solution which reacts with aqueous ammonia to form a white precipitate. The precipitate is soluble in excess ammonia. X could be A. AgCl B. PbBr 2 C. AlCl 3 D. ZnBr 2 86 Q.49 Which of the following metals will NOT displace copper ions from aqueous copper(ii) sulphate? A. Silver B. iron C. Zinc D. aluminium 88 Q.12 A metal X displaces copper from copper(ii) sulphate solution but does not displace zinc from zinc sulphate solution. Which of the following represents an increasing order for the reducing power of the three metals? A. Cu < X < Zn B. X < Cu < Zn C. Zn < X < Cu D. Zn < Cu < X

2 Metal and metal reactivity / Section 2 / Sect2pp.doc / S. W. Tse / P.2 88 Q.13 In which of the following cases would the rusting of the iron nail be most rapid? A. B. copper wire silver rod iron nail tap water C. D. copper wire copper rod iron nail tap water silver rod copper rod copper wire iron nail 2M NaCl solution copper wire iron nail 2M NaCl solution 88 Q.17 filter paper moistened with potassium chloride solution + - copper(ii) chromate crystal A potential difference is applied between the electrodes as shown in the above set-up. After some time a yellow colour is observed near the positive electrode. This is because A. copper(ii) chromate is yellow in colour. B. copper(ii) ions and chromate ions repel each other under the influence of the electric field. C. copper(ii) ions move away from the positive electrode, leaving chromate ions behind. D. chromate ions move towards the positive electrode. 89 Q.36 Which of the following metal oxides, when heated on a charcoal block, can be reduced to the corresponding metals? (1) CuO (2) PbO (3) MgO A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3)

3 Metal and metal reactivity / Section 2 / Sect2pp.doc / S. W. Tse / P.3 89 Q.37 Which of the following process could be used to slow down corrosion of an iron nail? (1) painting the nail (2) coating a layer of zinc on the nail (3) wrapping a strip of copper around the nail (4) 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 90 Q.49 Sea water can corrode ships more quickly than fresh water. Sodium chloride in sea water speeds up the corrosion of iron. 91 Q.8 X, Y and Z are metals. Y can displace X from a solution of the nitrate of 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. Z > Y > X B. X > Y >Z C. Z > X > Y D. X > Z > Y 92 Q.31 mineral wool soaked with water metal X heat heat In the above experiment, a gas is evolved and burns at the jet. Metal X is probably A. zinc. B. aluminium. C. magnesium. D. copper.

4 Metal and metal reactivity / Section 2 / Sect2pp.doc / S. W. Tse / P.4 92 Q.34 Which of the following metals can be obtained by reducing their oxides with carbon? (1) iron (2) calcium (3) lead A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3) Directions: Question 93 Q.20 and 93 Q.21 refer to the following experiment: Three different pairs of metal wires are placed separately in petri dishes (as shown in the diagram below) containing a mixture of helatin, potassium hexacyanoferrate (III) solution and phenolphthalein solution. Fe Mg Fe Cu Fe Fe Dish I Dish II Dish III 93 Q.20 Which of the following statements are correct? (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. A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3) 93 Q.21 In Dish II, which of the following colours will develop around the iron wire and the copper wire? iron wire copper wire A. pink blue B. blue pink C. pink no colour D. blue no colour

5 Metal and metal reactivity / Section 2 / Sect2pp.doc / S. W. Tse / P.5 94 Q.5 The reaction between sodium hydrogencarbonate solution and zinc sulphate solution can be represented by the following equation: 2NaHCO 3 (aq) + ZnSO 4 (aq) Na 2 SO 4 (x) + ZnCO 3 (y) + H 2 O(z) + CO 2 (g) Which of the following combinations is correct? X y z A. aq aq aq B. aq aq l C. aq s l D. s aq l 95 Q.5 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 95 Q.18 Metal X reacts with dilute hydrochloric acid to liberate H 2, but metal Y and metal 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. X < Y < Z B. Y < Z < X C. X < Z < Y D. Z < Y < X

6 Metal and metal reactivity / Section 2 / Sect2pp.doc / S. W. Tse / P.6 95 Q.27 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. B. mass of the contents of the test tube time C. D. mass of the contents of the test tube time mass of the contents of the test tube time mass of the contents of the test tube time 95 Q.45 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. 96 Q.8 Zinc blocks are often attached to the steel legs of off-shore oil platforms because A. zinc can protect steel legs 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.

7 Metal and metal reactivity / Section 2 / Sect2pp.doc / S. W. Tse / P.7 96 Q.36 Which of the following metals is / are present in solder? (1) copper (2) lead (3) iron A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only 96 Q.47 The resistance of aluminium to corrosion can be enhanced by anodisation. During anodisation, aluminium oxide on the metal surface is reduced to aluminium. 97 Q.12 Which of the following graphs best represents the change in mass with time when calcium carbonate is strongly heated? A. B. mass mass time C. D. time mass mass time time

8 Metal and metal reactivity / Section 2 / Sect2pp.doc / S. W. Tse / P.8 97 Q.32 Which of the following metal oxides can be reduced to the metal when heated with carbon? (1) aluminium oxide (2) lead (II) oxide (3) iron (III) oxide A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only 97 Q.41 Aluminium is used to make window frames because (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. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3) 97 Q.47 The reaction of sodium with water produces hydrogen. The reaction of sodium with water is exothermic. 97 Q.48 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.

9 Metal and metal reactivity / Section 2 / Sect2pp.doc / S. W. Tse / P.9 98 Q.11 Consider the following experiment. During the experiment, a gas is liberated. The gas can bum at the end of the delivery tube. X is probably A. Copper B. lead C. Silver D. zinc 98 Q.19 Which of the following combinations is correct? In each of the four solutions shown below, a strip of zinc is added. Tube Observation A. I No change B. II Brown coating on zinc C. III No change D. IV Grey coating on zinc

10 Metal and metal reactivity / Section 2 / Sect2pp.doc / S. W. Tse / P Q.40 Brass is commonly used for making ornaments because (1) it has an attractive appearance. (2) it can resist corrosion. (3) it is softer than copper. Which of the following combinations is correct? A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3) 99 Q.8 Iron can be produced from iron(iii) oxide by the following reaction: Fe 2 O 3(s) + 3CO (g) 2Fe (s) + 3CO 2(g) What mass of iron (III) oxide is required to produce 2.1 g of iron? (Relative atomic masses : O = 16.0, Fe = 56.0) A. 3.0 g B. 4.5 g C. 6.0 g D. 9.0 g 99 Q.18 Which of the following processes would NOT produce hydrogen gas? A. adding calcium to water B. adding magnesium to dilute hydrochloric acid C. adding copper to dilute nitric acid D. passing steam over red hot iron 99 Q.20 Which of the following solutions would produce a white precipitate with sodium hydroxide solution? A. lead(ll) nitrate solution B. iron(lll) nitrate solution C. copper(ll) nitrate solution D. potassium nitrate solution 99 Q.22 In which of the following situations 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.

11 Metal and metal reactivity / Section 2 / Sect2pp.doc / S. W. Tse / P Q.31 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. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only 99 Q.33 Which of the following reactions will occur when aluminium powder is added to silver nitrate solution? (1) displacement (2) anodization (3) redox A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only 99 Q.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. 00 Q.3 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. 00 Q.19 Gold ornaments are usually made from an alloy of gold and copper instead of pure gold. This is because the alloy A. can be found free in nature B. is more corrosion resistant than pure gold. C. is denser than pure gold. D. is stronger than pure gold.

12 Metal and metal reactivity / Section 2 / Sect2pp.doc / S. W. Tse / P Q.33 In an experiment, a piece of calcium metal was added to a beaker of water. Which of the following 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. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only 00 Q.50 Aluminium was used earlier than iron in the history of mankind. Aluminium is more abundant than iron in the earth crust. 01 Q.4 Which of the following combinations is INCORRECT? Metal Use A. chromium making stainless steel B. lead making solder C. nickel making rechargeable cells D. titanium making coins 01 Q.7 Which of the following statements concerning water is correct? A. It reacts with calcium to give a colourless gas. B. It is a strong eletrolyte. C. It turns anhydrous cobalt(ii) chloride from pink to blue. D. It is immiscible with methanol.

13 Metal and metal reactivity / Section 2 / Sect2pp.doc / S. W. Tse / P Q.30 Which iron nail in the test tubes shown below would rust most slowly? 01 Q.36 Which of following statements correctly describe(s) the advantage(s) of using aluminium over iron to make soft drink cans? (1) Aluminium is stronger than iron. (2) Aluminium is less dense than iron. (3) Aluminium is more corrosion-resistant than iron. A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only 01 Q.38 In which of the following experiments would a metal be produced? (1) heating silver oxide (2) heating iron pyrite (3) heating a mixture of lead(ii) oxide and carbon powder A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3)

14 Metal and metal reactivity / Section 2 / Sect2pp.doc / S. W. Tse / P Q.46 Electrical wire is made of bronze but not of copper. Bronze is more corrosion-resistant than copper. 02 Q.8 Which of the following statements concerning aluminium is correct? A. Aluminium is used to make stainless steel. B. The strength of aluminium can be enhanced by anodization. C. Aluminium is the most abundant element in the earth s crust. D. When aluminium is exposed to air, a layer of aluminium oxide is formed on its surface. 02 Q.26 When a piece of copper is dropped into an aqueous solution of compound X, the copper gradually dissolves. X is probably A. magnesium chloride. B. lead(ii) nitrate. C. Silver nitrate. D. ammonium chloride. 02 Q.27 Which of the following objects is least likely to contain titanium? A. missile B. water tap C. bicycle frame D. artificial hip joint

15 Metal and metal reactivity / Section 2 / Sect2pp.doc / S. W. Tse / P Q.9 Which iron nail in the beakers shown below would undergo corrosion most readily? 03 Q.40 Which of the following substances is/are alloy(s)? (1) stainless steel (2) anodised aluminium (3) 24-carat gold A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only 03 Q.50 Mild steel is less malleable than iron. Carbon atoms cause a distortion to the regular arrangement of the iron atoms in mild steel.

16 Metal and metal reactivity / Section 2 / Sect2pp.doc / S. W. Tse / P.16 M.C. Answer C 31 D 12 A 36 A 49 A 8 A 31 C 20 A 49 A 13 B 37 A 34 B 21 B 17 D C 5 D 8 A 12 A 11 D 8 A 3 B 4 D 8 D 18 B 36 B 32 D 19 C 18 C 19 B 7 A 26 C 27 C 47 C 41 A 40 A 20 A 33 C 30 C 27 B 45 D 47 B 22 C 50 C 36 D 48 A 31 A 38 B 33 C 46 C 46 A

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