CE Chemistry ~ Paper II. by Alan Cheng
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1 CE Chemistry ~ Paper II by Alan Cheng
2 2
3 There are 30 questions in Section A and 20 questions in Section B. Atomic numbers and relative atomic masses of elements can be obtained from the Periodic Table printed on page 1. Section A 1. Which of the following ions has the most electron shells that contain electrons? A. Be 2+ B. N 3- C. S 2- D. Al Which of the following pairs of species have the same number of protons? A. N 2 and O 2 B. N 3 and C 4 C. N 3- and Ne D. CO 2 and 2 O 3. The chemical properties of an element depend on A. Size of the atom. B. Mass of the atom. C. The number of electron shells of the atom. D. The number of outermost shell electrons of the atom. 4. Which of the following substances can be obtained from cracking of heavy oil? (1) C 3 8 (2) C 5 10 (3) CO 2 3
4 5. Which of the following pairs of solution, when mixed, would produce a white precipitate? A. Calcium chloride and sodium nitrate B. Silver nitrate and nitric acid C. Iron(II) sulphate and potassium hydroxide D. Magnesium nitrate and ammonia 6. Which of the following statements concerning sulphur dioxide are correct? (1) It can decolorize acidified potassium dichromate solution. (2) It can be collected by downward delivery. (3) It can be prepared by the reaction between sodium sulphite solution and dilute hydrochloric acid. 7. An atom must contain (1) proton. (2) electron. (3) neutron. 4
5 Which of the following statements concerning B and are correct? (1) They are isotopes of the same element. (2) They have the same chemical properties. (3) They have different number of neutron. 5 5 B 9. Element X and Y are in the same period of the periodic table. Which of the following statements concerning X and Y is / are correct? (1) They have similar chemical properties. (2) They have the same inner core electronic structure in their atoms. (3) They have the same number of outermost shell electrons in their atoms. A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only 10. When a piece of copper is dropped into a solution X, the copper gradually dissolves. Solution X is probably A. Silver nitrate B. Ethanoic acid C. Potassium iodide D. Sodium chloride 11. Which of the following pair of substances can react with each other to give a brown solution? A. Ethanoic acid and Sodium hydroxide solution. B. Copper turning and concentrated nitric acid. C. Ethanol and iodine in 1,1,1-trichloroethane. D. Sodium bromine solution and chlorine water. 5
6 12. Which of the following statements concerning chlorine water is / are correct? (1) It is a mixture. (2) It turns moist red litmus blue and then bleaches it. (3) It has no observable change when it is added to sodium chloride solution. A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only 13. Which of the following substances CANNOT be obtained from fractional distillation of liquid air? A. Oxygen B. Argon C. Nitrogen D. ydrogen 14. The structure of polymer W can be represented by C 2 5 Cl Cl C C C C C C Cl C 2 5 C 2 5 What is the monomer of W? A. 1-chlorobut-2-ene. B. 1-chloro-1-ethylethene. C. 1-chlorobut-1-ene D. 1-ethyl-1-chloroethene. 15. In which of the following reactions does the underlined substance act as a reducing agent? A. Mg + 2Cl MgCl B. 2 SO 4 + SO 3 2 S 2 O 7 C. SO 2 + 2NaO Na 2 SO O 6
7 D. 2MnO Mn 2 O O 16. In which of the following substances does sulphur has the smallest oxidation number? A. SO 2 B. SO 3 C. ZnS D. CaSO Which of the following combinations is correct? Pollutant Cutting down method A. sulphur dioxide Installation of catalytic converters B. Nitrogen oxides Installation of electrostatic precipitators C. ydrogen chloride Installation of scrubbers D. Carbon monoxide Using unleaded petrol Directions: Q.18 and Q.19 refer to the following chemical cell: 7
8 18. Which of the following statements concerning the above chemical cell is / are correct? (1) Zinc electrode is the anode. (2) The concentration of A 2+ ions in beaker X increase. (3) The salt bridge can be made from a filter paper soaked with calcium hydroxide solution. A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only 19. Which of the following metals can be used as metal A? A. copper B. magnesium C. silver D. lead 20. Which of the following health problems are associated with the excessive drinking of alcohol? (1) stomach ulcer (2) obesity (3) cirrhosis 8
9 21. Compound X has the following structure: O C O C C C Which of the following statements concerning compound X is correct? A. It has a pleasant smell. B. It turns blue litmus paper red. C. It can decolorize bromine in 1,1,1-trichloroethane. D. It can undergo addition polymerization. 22. Which of the following combinations is correct? Object Corrosion preventing method A. Coat hangers coated with grease B. Screw drivers coated with paint C. Food cans zinc plating D. Underground iron pipelines sacrificial protection 23. Which of the following gases can cause acid rain? (1) carbon dioxide (2) nitrogen dioxide (3) hydrogen chloride 9
10 24. Which of the following processes are chemical changes? (1) cracking of paraffin oil (2) pyrolysis of plastic wastes (3) fractional distillation of crude oil 25. Which of the following statements concerning liquefied petroleum gas (LPG) is / are correct? (1) LPG is manufactured by steam reforming of naphtha. (2) LPG is a mixture of gaseous hydrocarbons. (3) LPG is soluble in water. A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only 10
11 26. Which iron nail in the test tubes shown below would undergo corrosion most slowly? 27. Which of the following experiments would produce hydrogen gas? (1) adding potassium to cold water (2) adding copper turning to dilute sulphuric acid (3) adding magnesium ribbon to dilute nitric acid A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only 11
12 Direction: Each question below (Question Nos. 28 to 30) consists of two separate statements. Decide whether each of the two statements is true or false; if both are true, then decide whether or not the second statement is a correct explanation of the first statement. Then select one option from A to D according to the following table: A. Both statements are true and the 2 nd statement is a correct explanation of the 1 st statement. B. Both statements are true but the 2 nd statement is NOT a correct explanation of the 1 st statement. C. The 1 st statement is false but the 2 nd statement is true. D. Both statements are false. 1 st statement 2 nd statement 28. Ionic compounds are formed by metal and non-metal only. Calcium carbonate is an ionic compound. 29. The monomer of polythene is ethane. Polythene is a thermoplastic. 30. Ethanol can turn blue litmus paper red. The reaction of ethanol and methanoic acid is neutralization. END OF SECTION A 12
13 Section B 31. Which of the following pairs of solutions, when mixed, would give an acidic solution? A. 100 cm³ of 2 M sulphuric acid and 200 cm³ of 2 M potassium hydroxide solution. B. 50 cm³ of 1 M hydrochloric acid and 100 cm³ of 2 M sodium hydroxide solution. C. 100 cm³ of 2 M hydrochloric acid and 100 cm³ of 2 M potassium hydroxide solution. D. 50 cm³ of 1 M sulphuric acid and 50 cm³ of 1 M sodium hydroxide solution cm 3 of a 2.0 M acid solution requires 15.0 cm 3 of 2.0 M potassium carbonate solution for complete neutralization. What is the basicity of the acid? A. 1 B. 2 C. 3 D If 2 mole of helium gas contains x atoms, how many atoms in 3 mole of chlorine gas? A. x B. 2x C. 3x D. 4x 34. A sample of CuSO4.x2O(s) of mass g contains 9.0 g of water of crystallization. What is the value of x? A. 1 B. 5 C. 7 D A solid mixture contains magnesium oxide and magnesium chloride. Which of the following methods can obtain magnesium oxide from the mixture? A. Adding dilute sulphuric acid to the mixture and then filter. B. Adding dilute ethanoic acid to the mixture and then filter. C. Adding dilute hydrochloric acid to the mixture and then filter. D. Adding water to the mixture and then filter. 13
14 36. Which of the following solution has the lowest p value? A. 25 cm 3 of 1M Cl B. 50 cm 3 of 1 M C 3 COO C. 50 cm 3 of 1 M 2 CO 3 D. 25 cm 3 of 1 M 2 SO Which of the following substances can be used to distinguish between dilute sulphuric acid and concentrated sulphuric acid? (1) Calcium carbonate powder (2) Copper turnings (3) ydrated copper(ii) sulphate crystal 38. Which of the following statements concerning one mole of carbon dioxide gas is/are correct? (1) It contains of atoms. (2) It occupies the same volume as 16.0 g of methane gas at room temperature and pressure. (3) It occupies the same volume as 1 mole ethanol at room temperature and pressure. (Avogadro constant = ²³ mol -1 ) A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only 14
15 cm 3 of a gas Y 2 react completely with 300 cm 3 of oxygen to form 200 cm 3 of a gaseous oxide. If all measurements are made at room temperature and pressure, the formula of the gaseous oxide is A. YO 2 B. Y 2 O C. Y 2 O 3 D. Y 3 O Solution W is 50 cm 3 of 1.5 M Cl and Solution X is 100 cm 3 of 0.75 M C 3 COO. Which of the following statements concerning W and X is correct? A. X has a faster rate of reaction with 0.1 g magnesium ribbon than W. B. X has a lower p value than W. C. Both X and W needs the same concentration of 50 cm 3 NaO for complete neutralization. D. X has a higher electrical conductivity than W. 41. In the above graph, curve A was obtained by the reaction between 100 cm 3 of 1.5 M Cl and 10.0 g limestone. Which of the following changes would produce curve B? A. increasing the temperature by 20. B. using 200 cm 3 of 1.0 M Cl instead of 100 cm 3 of 1.5 M Cl C. using 100 cm 3 of 2.0 M Cl instead of 100 cm 3 of 1.5 M Cl D. using 15.0 g limestone instead of 10.0 g. 15
16 42. During the electrolysis of concentrated copper(ii) chloride solution by using copper electrodes. Which of the following combination is correct? Anode Cathode A. oxygen liberated copper deposited B. copper dissolved copper deposited C. chlorine liberated hydrogen liberated D. copper deposited hydrogen liberated 43. Which apparatus should be used to prepare 250 cm 3 of 1.0 M citric acid from its solid? (1) pipette (2) volumetric flask (3) wash bottle 44. Which of the following reactions does not require the use of a catalyst? A. Cracking of kerosene. B. Conversion of sulphur trioxide gas to oleum. C. ydrogenation of ethene to ethane. D. Condensation polymerization of urea-methanal. 45. Which of the following substances are presences in aqueous ammonia? (1) O - + (2) N 4 (3) N 3 16
17 46. Which of the following cases is a practicable way of preparing the salt underlined? A. 2Na(s) + 2Cl(aq) 2NaCl(aq) + 2 (g) B. CuCl 2 (aq) + Ca(NO 3 ) 2 (aq) CaCl 2 (aq) + Cu(NO 3 ) 2 (aq) C. (N 4 ) 2 SO 4 (aq) + MgCl 2 (aq) MgSO 4 (aq) + 2N 4 Cl(aq) D. Pb(NO 3 ) 2 (aq) + K 2 SO 4 (aq) PbSO 4 (s) + 2KNO 3 (aq) 47. Which of the following statements concerning soapy detergent are correct? (1) It is an ester. (2) Its solution is alkaline. (3) It can be used in hard water with water softener. 17
18 Direction: Each question below (Question Nos. 48 to 50) consists of two separate statements. Decide whether each of the two statements is true or false; if both are true, then decide whether or not the second statement is a correct explanation of the first statement. Then select one option from A to D according to the following table: A. Both statements are true and the 2 nd statement is a correct explanation of the 1 st statement. B. Both statements are true but the 2 nd statement is NOT a correct explanation of the 1 st statement. C. The 1 st statement is false but the 2 nd statement is true. D. Both statements are false. 1 st statement 2 nd statement 48. Acid salt solution is acidic. Sodium hydrogensulphate is an acid salt. 49. Urea-methanal is used to make ashtray. Urea-methanal is a condensation polymer. 50. Copper is a weaker reducing agent than silver. Copper can react with concentrated nitric acid but silver does not. END OF PAPER 18
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