85 Q.1 A substance X melts at 1600 o C. Its does not conduct electricity in the solid or in the molten state. X probably has

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1 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.1 85 Q.1 A substance X melts at 1600 o C. Its does not conduct electricity in the solid or in the molten state. X probably has A. an ionic structure. B. a giant covalent structure. C. a simple molecular structure. D. a metallic structure. 85 Q.3 The table below shows the number of neutrons and electrons in the following five atoms / ions: atoms / ions number of neutrons number of electrons P 8 8 Q R S T 8 9 Which of the following atoms is an isotope of P? A. Q B. R C. S D. T 85 Q.4 Which of the following pairs of atomic numbers represents elements with similar chemical properties? A. 3 and 12 B. 9 and 16 C. 6 and 17 D. 12 and Q.7 Lead (II) chloride does not conduct electricity at room temperature because A. it is a covalent compound. B. it is insoluble in water. C. it does not contain ions. D. its ions are not mobile. 85 Q.29 Many covalent compounds are liquids or gases. All covalent bonds are weak bonds. 1st statement 2nd statement A. True True 2nd statement is a correct explanation of the 1st one. B. True True 2nd statement is NOT a correct explanation of the 1st one. C. True/False False/True Only ONE of the statements is true, the other is false. D. False False -----

2 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.2 85 Q.36 Which of the following molecules has only one lone pair of electrons? A. C 2 H 4 B. NH 3 C. H 2 O D. HBr 86 Q.2 The melting points of diamond, sodium chloride and potassium increase in the order: A. diamond, sodium chloride, potassium B. potassium, sodium chloride, diamond C. sodium chloride, diamond, potassium D. sodium chloride, potassium, diamond 86. Q.9 Element X and Y have atomic numbers 8 and 12 respectively. The formula for the compound formed between X and Y would be A. YX B. Y 2 X C. YX 2 D. Y 2 X 3 86 Q.11 Which of the following molecules has the greatest number of lone pairs of electrons? A. ammonia B. hydrogen fluoride C. methane D. water 86 Q.37 The melting points of some chlorides are given below: NaCl 801 o C MgCl o C SiCl 4-68 o C Which of the following statements would be consistent with the above data? (1) NaCl can conduct electricity at 810 o C. (2) MgCl 2 is a liquid at 600 o C. (3) SiCl 4 is a covalent compound. A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only

3 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.3 86 Q.38 Bromine exists in two isotopic forms, Br and Br. The relative atomic mass of bromine is Which of the following statements is/are correct? (1) The relative abundance of each isotopic form is about the same. (2) The two isotopes have different numbers of protons. (3) The two isotopes have different numbers of neutrons. A. (2) only B. (3) only C. (1) and (2) only D. (1) and (3) only 86 Q.43 At room temperature and pressure, iodine exists as (1) molecules held together by covalent bonds. (2) ions is a lattice. (3) molecules held together by van der Waals forces. A. (1) only B. (3) only C. (1) and (2) only D. (2) and (3) only 86 Q.44 Sulphur is classified as a non-metal because (1) it has a low density. (2) it forms acidic oxides. (3) it is non-conductor of electricity in the solid state. A. (1) only B. (3) only C. (1) and (2) only D. (2) and (3) only 86 Q.48 Astatine (At) is a halogen at the bottom of group VII in the Periodic Table. From knowledge of trends in periodicity, which of the following predictions is UNLIKELY? A. It will form an anion At -. B. It will exist as a solid at room temperature. C. It will be readily soluble in water. D. It will exist as diatomic molecules in the gaseous state. 87 Q.1 The atomic number of an element X is 12. The atomic number of another element with chemical properties similar to those of X is A. 8. B. 16. C. 20. D. 22.

4 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.4 87 Q.2 The atomic numbers of two elements A and B are 20 and 17 respectively. The compound formed between A and B A. is a liquid at room temperature. B. conducts electricity when it is in the molten state. C. has a formula A 2 B. D. is insoluble in water. 87 Q.3 In which of the following pairs would both members have the same electronic configuration? A. O 2-, F B. Ne, Na + C. Na, Mg 2+ D. S, Cl - 87 Q.32 Nitrogen does not react readily with other elements or compounds. The outermost electron shell of the nitrogen atom is completely filled. 1st statement 2nd statement A. True True 2nd statement is a correct explanation of the 1st one. B. True True 2nd statement is NOT a correct explanation of the 1st one. C. True/False False/True Only ONE of the statements is true, the other is false. D. False False Q.40 The production cost of helium is much higher than that of oxygen because (1) helium is very difficult to liquefy. (2) helium is very inert. (3) there is not much helium in air. A. (1) only B. (1) and (2) only C. (1) and (3) only D. (2) and (3) only 88 Q.2 The atomic number and mass number of a sodium atom are 11 and 23 respectively. Its nucleus contains A. 11 neutrons and 12 protons. B. 12 neutrons and 11 protons. C. 12 neutrons and 23 protons. D. 23 neutrons and 11 protons.

5 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.5 88 Q.3 Which of the following compounds has the largest number of lone pairs of electrons on the central atom? A. CCl 4 B. NH 3 C. H 2 S D. CO Q.1 With reference to the data given in the table: Element Atomic number Mass Number X Y 9 19 The relative molar mass of the compound formed between X and Y is A. 21. B. 43. C. 62. D Q.3 Solid lead (II) bromide is a non-conductor of electricity because A. it is a covalent compound. B. it is not soluble in water. C. the lead and bromide ions are not freely moving. D. lead conducts electricity but bromine does not. 89 Q.28 Graphite is a rather soft substance. All the bonds between the carbon atoms in graphite are weak. 1st statement 2nd statement A. True True 2nd statement is a correct explanation of the 1st one. B. True True 2nd statement is NOT a correct explanation of the 1st one. C. True/False False/True Only ONE of the statements is true, the other is false. D. False False Q.33 Which of the following exists as discrete molecules at room temperature and pressure? (1) graphite (2) bromine (3) hydrogen chloride (4) calcium chloride A. (1) and (4) only B. (2) and (3) only C. (1), (2) and (3) only D. (2), (3) and (4) only

6 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.6 89 Q.34 Which of the following electronic structures is / are correct? (1) N N (for N 2 ) 2- (2) S (for S 2- ) (3) O C O (for CO 2 ) A. (1) only B. (1) and (2) only C. (2) and (3) only D. (1), (2) and (3) 90 Q.2 A cation of certain element has 22 electrons and a mass number of 55. If the charge on the cation is +3, the number of number of neutrons in the cation is A. 19. B. 23. C. 25. D Q.3 The atomic numbers of element X and element Y are 13 and 16 respectively. The formula of the compoud between X and Y is likely to be A. XY 2. B. X 2 Y. C. X 2 Y 3. D. X 3 Y Q.4 Which of the following combinations concerning the isotopes of an element is correct? No.of protons No. of neutrons No. of electrons A. same different same B. same same different C. different same different D. same different different 90 Q.25 Bromine has a low melting point because A. it is a non-metal. B. it is member of the halogen family. C. the atoms in each bromine molecule are bonded together by a covalent bond. D. the bromine molecules are attracted together by van der Waals forces.

7 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.7 90 Q.26 Dry zinc chloride solid is a non-conductor of electricity because A. it is a non-electrolyte. B. it exists as molecules. C. its ions are not mobile. D. metallic bonding is not present. Directions: Question 91 Q.1 and 91 Q.2 refer to the following table. Element W X Y Z Atomic number Q.1 Which of the following elements are likely to be metals? A. W and X B. W and Z C. X and Y D. Y and Z 91 Q.2 The formula of the compound formed between X and Z is likely to be A. XZ. B. XZ 2. C. X 2 Z. D. X 2 Z Q.4 Which of the following groups of ions / atoms has the same number of electrons? A. K +, Ca 2+ B. Cl -, S C. H +, He D. O 2-, Ar 92 Q.2 X and Y are elements. The melting points of their chlorides are given below: Melting point ( o C) Chloride of X 772 Chloride of Y -68 Which of the following statements is correct? A. Both X and Y are metals. B. The chloride of Y is a solid at room temperature. C. The chloride of X conducts electricity in the solid state. D. The chloride of Y is a covalent compound.

8 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.8 92 Q.3 Which of the following electron diagram is correct? A. F F B. O C. N N D. He He 92 Q.30 The atomic number and mass number of element E are 8 and 17 respectively. What are the numbers of protons and neutrons in an atom of E? Number of protons Number of neutrons A. 8 9 B C. 9 8 D Q.33 Which of the following ions is / are coloured? (1) Pb 2+ (aq) (2) Cr 3+ (aq) (3) MnO 4 - (aq) A. (1) only B. (3) only C. (1) and (2) only D. (2) and (3) only 92 Q.45 Both zinc and molten sodium chloride conduct electricity. Both zinc and molten sodium chloride contains mobile ions. 1st statement 2nd statement A. True True 2nd statement is a correct explanation of the 1st one. B. True True 2nd statement is NOT a correct explanation of the 1st one. C. True/False False/True Only ONE of the statements is true, the other is false. D. False False Q.1 Which of the following pairs of atoms / ions has the same number of electrons? A. Mg 2+ and F B. Cl - and Ne C. K + and O 2- D. Cl - and S 2-

9 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.9 93 Q.2 The elements, sodium to chlorine, in the third period of the Periodic Table show a gradual change in properties. Which of the following changes is correct? A. Their melting points increase. B. Their ability to gain electrons increase. C. Their oxides change from acidic to basic. D. Their chlorides change from covalent to ionic. 93 Q. 4 The element with atomic number 11 will combine most readily with the element whose atomic number is A. 12. B. 13. C. 17. D Q.7 CO 2 (g) + CaCO 3 (x) + H 2 O(y) Ca(HCO 3 ) 2 (z) In the above chemical equation, which of the following combinations is correct? x y z A. aq l aq B. s aq s C. s l s D. s l aq 94 Q.1 If the atomic number of an element X is 13, the formula of its oxide is A. XO 2.` B. XO 3. C. X 2 O 3. D. X 3 O Q.2 Consider the information given in the table below: Atom Atomic number Mass number No. of neutrons P 6 14 Q 7 14 R 13 7 S T Which of the following atoms are isotopes? A. P and Q B. P and R C. R and S D. S and T

10 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P Q.3 Which of the following molecules has the greatest number of lone pairs of electrons? A. fluorine B. hydrogen C. nitrogen D. oxygen Directions: Question 94 Q.6 and 94 Q.7 refer to the following experiment: A drop of silver nitrate solution and a drop of sodium iodide solution are placed respectively at X and Y as shown in the diagram below: filter paper moistened with potassium microscopic slide nitrate solution electrode electrode X Y 20 V d.c. supply After the circuit has been closed for some time, a coloured patch is formed between X and Y. 94 Q.6 What is the colour of the patch? A. brown B. purple C. yellow D. black 94 Q.7 The main aim of this experiment is to shown that A. ions exist in silver nitrate solution and sodium iodide solution. B. sodium ions can react with nitrate ions. C. silver ions can react with iodide ions. D. potassium nitrate is an electrolyte.

11 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P Q.36 X, Y and Z are three different elements. The electronic diagram (showing electrons in the outermost shells only) of the compound formed by X, Y and Z is shown below: X X Y X Z X Which of the following statements are correct? (1) There is one electron in the outermost shell of an atom of X. (2) There are five electrons in the outermost shell of an atom of Y. (3) There are eight electrons in the outermost shell of an atom of Z. A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3) 94 Q.37 Which of the following statements concerning the reaction between yellow phosphorus and chlorine are correct? (1) yellow phosphorus burns spontaneously in chlorine. (2) White fumes of phosphorus (III) chloride are formed. (3) White fumes of phosphorus (V) chloride are formed. A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3) 94 Q.46 Hydrogen chloride has a lower melting point than sodium chloride. In each molecule of hydrogen chloride, a hydrogen atom and a chlorine atom are joined together by a covalent bond. 1st statement 2nd statement A. True True 2nd statement is a correct explanation of the 1st one. B. True True 2nd statement is NOT a correct explanation of the 1st one. C. True/False False/True Only ONE of the statements is true, the other is false. D. False False -----

12 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P Q.1 The atomic number of an element X is 18. An atom of X has a mass number of 40. The atom has A. 18 protons, 22 neutrons and 18 electrons. B. 18 protons, 22 neutrons and 22 electrons. C. 18 protons, 40 neutrons and 18 electrons. D. 22 protons, 22 neutrons and 18 electrons. 95 Q.2 The electronic structure of a compound formed between an element X and chlorine is shown below. Cl X Cl Cl (Only electrons in the outermost shells are shown.) What would be the formula of the compound between X and magnesium? A. MgX B. MgX 2 C. Mg 2 X 3 D. Mg 3 X 2 95 Q.3 Which of the following correctly describes the structure of quartz? A. giant covalent structure B. giant ionic structure C. giant metallic structure D. simple molecular structure 95 Q.4 Boron consists of two isotopes. The table below lists the relative abundance of these two isotopes. Isotope Relative abundance 10 B 19.7% 5 11 B 80.3% 5 The relative atomic mass of boron (correct to 1 decimal place) is A B C D

13 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P Q.26 Which of the following elements is a semi-metal? A. Hg B. Si C. C D. Be 95 Q.34 Which of the following particles is / are present in a hydrogen ion? (1) proton (2) neutron (3) electron A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only 95 Q.39 Which of the following substances can conduct electricity? (1) molten zinc chloride (2) an aqueous solution of magnesium sulphate (3) a mixture of ethanol and water A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3) 96 Q.1 Magnesium can calcium have similar properties because A. their atoms have the same atomic structure. B. their atoms have the same number of electron shells. C. their atoms have the same number of electrons in their outermost shells. D. their atoms have the same electronic arrangement. 96 Q.2 Which of the following can represent the electronic structure of potassium sulphide? A. K 2 + S 2- B. 2 K + S 2- C. K 2+ S 2- D. K S

14 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P Q.3 The mass number of atom X is 27. X forms a cation with a charge of +3. If the number of neutrons in the cation is 14, what is the number of electrons in the cation? A. 10 B. 13 C. 14 D Q.44 Which of the following elements can react together to form a covalent compound? (1) argon (2) nitrogen (3) oxygen (4) calcium A. (1) and (2) only B. (1) and (4) only C. (2) and (3) only D. (3) and (4) only 96 Q.45 The melting point of hydrogen chloride is lower than that of potassium chloride. Hydrogen chloride is a covalent compound whereas potassium chloride is an ionic compound. 1st statement 2nd statement A. True True 2nd statement is a correct explanation of the 1st one. B. True True 2nd statement is NOT a correct explanation of the 1st one. C. True/False False/True Only ONE of the statements is true, the other is false. D. False False Q.50 Both dry ice and quartz exist in the form of discrete molecules. Carbon and silicon atoms have the same number of electrons in their outermost shells. 1st statement 2nd statement A. True True 2nd statement is a correct explanation of the 1st one. B. True True 2nd statement is NOT a correct explanation of the 1st one. C. True/False False/True Only ONE of the statements is true, the other is false. D. False False Q.1 The chemical properties of an element depend on A. its relative atomic mass. B. the number of isotopes of the element. C. the number of electron shells in its atoms. D. the number of outermost shell electrons in its atoms.

15 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P Q.2 Elements X and Y form a compound having the following electronic structure: Y X (Only outermost shell electrons are shown.) Which of the following combinations is correct? X Y A. Na S B. Mg Br C. Al Cl D. Si O Y 97 Q.3 Argon exists as a gas room temperature and pressure because A. argon molecules are monoatomic. B. argon is chemically inert. C. the outermost electron shell of an argon atom has an octet structure. D. the attractive force between argon atoms is weak. 97 Q.5 Which of the following diagrams best represents a part of the giant lattice of sodium chloride crystal? (In these diagrams, represents Na + ion and represents Cl - ion.) A. B. C. D.

16 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P Q.30 M is an element in the third period of the Periodic Table. M forms a sulphate which has the formula M 2 (SO 4 ) 3. The formula of the nitrate of M is A. MNO 3. B. M(NO 3 ) 2. C. M(NO 3 ) 3. D. M 2 (NO 3 ) Q.1 An element X exists as molecules. X has an atomic number of 7 and a molecule of X has a formula X 2. Which of the following can represent the electronic structure of X 2? A. B. C. D. 98 Q.2 The formula for ozone is 0 3. If one mole of ozone contains X atoms, how many atoms will one mole of oxygen gas contain? A. B. C. D. 98 Q.6 A part of the Periodic Table is shown below. Which of the following statements is correct? A. The outermost electron shell of an atom of a is an octet structure. The metallic character of the Period 2 elements increases from b to d. C. c forms an ionic compound with d. D. e is a strong oxidizing agent.

17 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P Q. 18 Which of the following ions has the same number of protons as the hydroxide ion, OH? A. O 2- B. F - C. Na + D. Mg Q.33 Consider the following information: Which of the above substances exists as a simple molecular solid at room temperature? A. W B. X C. Y D. Z 98 Q.46 Element X (atomic number 11) reacts with element Y (atomic number 16) to form an ionic compound. Each atom of X loses one electron and each atom of Y accepts two electrons to form a compound with formula X 2 Y. 1st statement 2nd statement A. True True 2nd statement is a correct explanation of the 1st one. B. True True 2nd statement is NOT a correct explanation of the 1st one. C. True/False False/True Only ONE of the statements is true, the other is false. D. False False Q.1 Which of the following diagrams can represent a mixture of two compounds? (In these diagrams, and represent a nitrogen atom and an oxygen atom respectively.)

18 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P Q.2 One mole of calcium bromide contains A. 1 mole of molecules. B. 2 moles of cations. C. 2 moles of cations. D. 3 moles of atoms. 99 Q.4 Element X and element Y belong to the three periods of the Periodic Table. The compound formed between these two elements has the following electronic structure: (Only outermost shell electrons are shown.) How many electrons are there in the outermost shell of an atom of X and that of Y? X Y A. 1 3 B. 1 5 C. 2 8 D Q.5 Consider the information concerning particle X and particle Y listed below: Particle Number of protons Number of electrons Number of neutrons X Y Which of the following statement is correct? A. X and Y are atoms of the same element. B. X and Y are atoms of different elements. C. X is a cation of Y. D. Y is an anion of X. 99 Q.10 Which of the following statements concerning bromine and chlorine is INCORRECT? A. They exist as diatomic molecules. B. Their atoms have the same number of outermost shell electrons. C. They form ions with a single negative charge. D. Bromine is a stronger oxidizing agent than chlorine.

19 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P Q.11 The table below shows the ability of four substances W, X, Y, and Z to conduct electricity. (In the table, and X respectively represent can conduct electricity and cannot conduct electricity.) Substance Solid State Liquid State Aqueous Solution W X X X X Y X X X Z (insoluble in water) Which of the substances is likely to be zinc chloride? A. W B. X C. Y D. Z 99 Q.13 Which of the following ions is responsible for the yellow colour of topaz? A. Ni 2+ B. Fe 3+ C. Cr 3+ D. Mn Q.17 The compound X 2 S contains 58.9% of X by mass. What is the relative atomic mass of X? (Relative atomic mass : S = 32.1) A B C D Q.19 Ionic compound X has the formula AB 2, where A and B represent the cation and anion respectively. If both A and B have the same electronic arrangement, X may be A. potassium sulphide. B. magnesium fluoride. C. silicon dioxide. D. calcium bromide. 99 Q.21 Consider the following chemical equation: 2HNO 3 + xfeso 4 + yh 2 SO 4 zfe 2 (SO 4 ) 3 + 4H 2 O + 2NO Which of the following combinations is correct? X Y Z A B C D

20 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P Q.34 Iodine is a solid at room temperature and pressure. Which of the following statements concerning the structure of iodine is/are correct? (1) Iodine has a giant covalent structure. (2) Iodine molecules are held together by van der Waals forces. (3) Iodine atoms are held together in pairs by covalent bonds. A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only 99 Q Element X has an isotope 15 X. Which of the following statements is/are correct? (1) X belongs to Group V of the Periodic Table. (2) X can react with oxygen to form an ionic compound. (3) X has 16 neutrons. A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only 99 Q.42 Which of the following statements concerning the experiment are correct? (1) Gas bubbles are evolved at electrode X. (2) An orange colour gradually appears in the solution around.electrode Y. (3) The experiment can be used to show that ions migrate towards oppositely charged electrodes. A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3)

21 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P 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. 1st statement 2nd statement A. True True 2nd statement is a correct explanation of the 1st one. B. True True 2nd statement is NOT a correct explanation of the 1st one. C. True/False False/True Only ONE of the statements is true, the other is false. D. False False Q.1 A compound formed from element X and sulphur has the following electronic structure: (Only electrons in the outermost shells are shown.) How many electrons are there in the outermost shell of an atom of X? A. 2 B. 4 C. 6 D Q.2 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 Cs 2 O. 00 Q.7 Element X occurs in nature as two isotopes, 63 X and 65 X. If the relative atomic mass of X is 63.5, what is the relative abundance of the 63 X isotope? A. 25% B. 60% C. 75% D. 90% 00 Q.9 The atomic number of element X is 12. X reacts with element Y to form an ionic compound with formula XY 2. To which group of the Periodic Table does Y belong? A. Group I B. Group IV C. Group VI D. Group VII

22 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P Q.12 Which of the following natural substances is essentially a single compound? A. Air B. coal C. petroleum D. quartz 00 Q.17 The melting point and boiling point of substance X are 321 C and 765 C respectively. In its molten sate, X conducts electricity without decomposition, X probably has A. an ionic structure. B. a metallic structure. C. a simple molecular structure. D. a covalent network structure. 00 Q.34 Which of the following statements concerning helium is/are correct? (1) The outermost electron shell of a helium atom has an octet structure. (2) Helium is used to fill weather balloons. (3) Helium exists as monatomic molecules. A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only 00 Q.39 X is an element in Group VI of the Periodic Table. X can form X 2- ions. Which of the following statements are correct? (1) The oxidation number of X decreases when X 2 - ion is formed. (2) Both X atom and X 2- ion have the same number of electron shells. (3) Both X atom and X 2- ion have the same nuclear charge. A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3) 00 Q.42 Which of the following statements concerning carbon, silicon and phosphorus are correct? (1) Carbon forms numerous compounds with hydrogen and oxygen. (2) Silicon is used to make computer chips. (3) Phosphorus is an essential element for plant growth. A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3)

23 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P Q.46 Carbon dioxide and silicon dioxide have similar physical properties. The atoms of carbon and silicon have the same number of electrons in their outermost shells. 1st statement 2nd statement A. True True 2nd statement is a correct explanation of the 1st one. B. True True 2nd statement is NOT a correct explanation of the 1st one. C. True/False False/True Only ONE of the statements is true, the other is false. D. False False Q.1 Which of the following ions is responsible for the yellow colour of topaz? A. Mn 2+ B. Mn 3+ C. Fe 2+ D. F e3+ 01 Q.3 Which of the following processes is exothermic? A. melting of ice B. evaporation of ethanol C. sublimation of iodine D. dissolving sodium hydroxide pellets in water 01 Q.5 Which of the following substances can conduct electricity in both solid and liquid states? A. sulphur B. mercury C. quartz D. lead(ii) bromide 01 Q.8 Which of the following statements concerning the formation of chloride ions from chlorine atoms is correct? A. The number of shells occupied by electrons in a chlorine atom equals that in a chloride ion. B. The atomic number of chlorine increases by 1. C. The mass number of chlorine increases by 1. D. The change is an oxidation.

24 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P Q.18 Consider the following information about four substances, W, X, Y and Z: Substance Melting Point/ Electrical conductivity at room temperature W -23 poor X 56 poor Y 232 good Z 750 poor Which substance has a simple molecular structure and is a solid at room temperature? A. W B. X C. Y D. Z 01 Q.20 The table below lists some information about two elements, X and Y: Element Atomic number Relative atomic mass X Y The compound formed from X and Y has a formula mass of A B C D Q.26 What is the percentage by mass of chromium in potassium dichromate? (Relative atomic masses : O = 16.0, K = 39.1, Cr = 52.0) A B C D Q.37 Consider the information listed below: Substance Attraction between particles in substance (1) helium van der Waals forces (2) diamond covalent bond (3) magnesium oxide ionic bond Which of the following combinations are correct? A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3)

25 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P Q.42 Which of the following ions have the same number of electrons as a neon atom? (1) Mg 2+ (2) O 2- (3) Cl - A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3) 01 Q.49 Lithium is the most reactive element in Group 1 of the Periodic Table. Among the Group 1 elements, lithium loses electrons most readily. 1st statement 2nd statement A. True True 2nd statement is a correct explanation of the 1st one. B. True True 2nd statement is NOT a correct explanation of the 1st one. C. True/False False/True Only ONE of the statements is true, the other is false. D. False False Q.1 The electronic diagram of an atom of element X is shown below: (Only electrons in the outermost shell are shown.) The atomic number of X is probably A. 7 B. 15 C. 17 D Q.2 Which of the following compounds, when dissolved in water, gives a green solution? A. copper(ii) sulphate B. nickel(ii) sulphate C. cobalt(ii) chloride D. iron(iii) sulphate 02 Q.3 An oxide of element X has the formula X 2 O g of this oxide contains 5.4 g of X. What is the relative atomic mass of X? (Relative atomic mass: O = 16.0) A B C D. 36.0

26 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P Q.28 Which of the following substances does not conduct electricity in its solid state but does conduct electricity in its liquid state? A. lithium chloride B. phosphorus C. platinum D. perspex 02 Q.36 Which of the following statements concerning fluorine is/are correct? (1) It exists as monatomic molecules. (2) It reacts with hydrogen to form a covalent compound. (3) It reacts with calcium to form a compound with the formula CaF 2. A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) 02 Q.45 Nitrogen monoxide is a gas at room temperature and pressure. 02 Q.46 Combustion of diamond gives carbon dioxide. 02 Q.49 When iodine sublimes, it absorbs energy. Nitrogen monoxide is a covalent compound. Diamond is a crystalline form of carbon. Energy is required to overcome the attractive force between iodine molecules. 1st statement 2nd statement A. True True 2nd statement is a correct explanation of the 1st one. B. True True 2nd statement is NOT a correct explanation of the 1st one. C. True/False False/True Only ONE of the statements is true, the other is false. D. False False Q.1 Which of the following pairs of elements in Groups I and VII of the Periodic Table would react with each other most vigorously? Group I Group VII A. lithium fluorine B. lithium iodine C. potassium fluorine D. potassium iodine

27 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P Q.2 Which of the following substances, upon heating in a test tube, would undergo a chemical change? A. water B. calcium oxide C. sodium chloride D. hydrated copper(ii) sulphate 03 Q.7 Which of the following statements concerning halogens is INCORRECT? A. Compounds of fluorine are added to tap water to help prevent tooth decay. B. Chlorine is used as a sterilizing agent. C. Bromine is a volatile liquid. D. Iodine vapour is brown in colour. 03 Q.12 Gallium (Ga) occurs naturally in two isotopic forms, 69 Ga and 71 Ga. The table below lists the relative abundance of each isotope. Isotope Relative abundance 69 Ga 60.2% 74 Ga 39.8% What is the relative atomic mass of gallium? A B C D Q.14 Which of the following statements about carbon dioxide is correct? A. Solid carbon dioxide has a covalent network structure. B. Carbon dioxide is used to put out electrical fire. C. Carbon dioxide is used in filling weather balloons. D. Carbon dioxide dissolves in water to give a solution which is slightly alkaline.

28 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P Q.23 Consider the following equation: 5H 2 S(g) + 2KMnO 4 (aq) + 3H 2 SO 4 (aq) 5S(x) + 8H 2 O(y) + 2MnSO 4 (z) + K 2 SO 4 (aq) Which of the following combinations is correct? X Y Z A. s aq aq B. s l aq C. aq aq s D. aq l s 03 Q.25 An atom of element X has 20 protons while an atom of element Y has 7 electrons. What is the formula of the compound formed from X and Y? A. XY 2 B. X 2 Y 3 C. X 2 Y 5 D. X 3 Y 2 03 Q.28 Which of the following gases contains the greatest number of molecules? (Relative atomic masses: H = 1.0, C = 12.0, O = 16.0, Ne = 20.2, Cl = 35.5) A g of neon B g of oxygen C g of hydrogen chloride D g of carbon monoxide 03 Q.32 Which of the following processes is/are physical change(s)? (1) rusting of iron (2) formation of dry ice from carbon dioxide gas (3) removal of particulates in an incinerator using an electrostatic precipitator A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) 03 Q.42 Iron pyrite (FeS 2 ) looks like gold and its common name is fool s gold. Which of the following methods can be used to distinguish iron pyrite from gold? (1) comparing their densities (2) comparing their electrical conductivity (3) comparing the effect of heat on them A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3)

29 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P Q Cl and 37 Cl have the same chemical properties. The number of electrons in the outermost shell of a 35 Cl atom is equal to that of a 37 Cl atom. 1st statement 2nd statement A. True True 2nd statement is a correct explanation of the 1st one. B. True True 2nd statement is NOT a correct explanation of the 1st one. C. True/False False/True Only ONE of the statements is true, the other is false. D. False False -----

30 Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.30 M.C. Answer B 2 B 1 C 2 B 1 C 2 D 1 B 2 D 1 D 3 B 9 A 2 B 3 C 3 C 3 C 2 A 3 C 2 B 4 D 11 B 3 B 28 C 4 A 4 A 30 A 4 C 7 D 37 C 32 C 33 B 25 D 33 D 7 D 29 C 38 D 40 C 34 B 26 C 45 C 36 B 43 B 44 D 48 C C 1 A 1 C 1 D 1 D 1 B 1 B 1 D 1 C 2 B 2 D 2 B 2 B 2 B 2 C 2 A 3 D 2 B 3 A 3 A 3 A 3 D 6 D 4 B 7 C 5 B 3 C 6 C 4 C 44 C 5 C 18 B 5 D 9 D 8 A 28 A 7 A 26 B 45 B 30 C 33 B 10 D 12 D 18 B 36 D 36 A 34 A 50 C 46 C 11 A 17 B 20 B 45 B 37 D 39 A 13 B 34 D 26 C 46 A 46 B 17 B 39 D 37 D 49 A 19 B 42 D 42 A 21 D 46 C 49 D 34 D 39 C 42 D 46 A

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