Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.1
85 Q.1
A substance X melts at 1600oC. Its does not conduct electricity in the solid or in the molten
state. X probably has
A.
B.
C.
D.
an ionic structure.
a giant covalent structure.
a simple molecular structure.
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
2+
12
10
Q
R210
10
+
S
12
10
T
8
9
Which of the following atoms is an isotope of P?
A.
C.
Q
S
B.
D.
R
T
85 Q.4
Which of the following pairs of atomic numbers represents elements with similar chemical
properties?
A.
C.
3 and 12
6 and 17
B.
D.
9 and 16
12 and 20
85 Q.7
Lead (II) chloride does not conduct electricity at room temperature because
A.
B.
C.
D.
it is a covalent compound.
it is insoluble in water.
it does not contain ions.
its ions are not mobile.
85 Q.29
Many covalent compounds are liquids or
gases.
A.
B.
C.
D.
1st statement
True
True
True/False
False
2nd statement
True
True
False/True
False
All covalent bonds are weak bonds.
2nd statement is a correct explanation of the 1st one.
2nd statement is NOT a correct explanation of the 1st one.
Only ONE of the statements is true, the other is false.
-----
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.
C2H4
H2O
B.
D.
NH3
HBr
86 Q.2
The melting points of diamond, sodium chloride and potassium increase in the order:
A.
B.
C.
D.
diamond, sodium chloride, potassium
potassium, sodium chloride, diamond
sodium chloride, diamond, potassium
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.
C.
YX
YX2
B.
D.
Y2X
Y2X3
86 Q.11
Which of the following molecules has the greatest number of lone pairs of electrons?
A.
C.
ammonia
methane
B.
D.
hydrogen fluoride
water
86 Q.37
The melting points of some chlorides are given below:
NaCl
801oC
MgCl2
712oC
-68oC
SiCl4
Which of the following statements would be consistent with the above data?
(1) NaCl can conduct electricity at 810oC.
(2) MgCl2 is a liquid at 600oC.
(3) SiCl4 is a covalent compound.
A.
C.
(1) only
(1) and (3) only
B.
D.
(2) only
(2) and (3) only
Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.3
86 Q.38
81
Bromine exists in two isotopic forms, 79
35 Br and 35 Br . The relative atomic mass of bromine is
79.9. 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.
C.
(2) only
(1) and (2) only
B.
D.
(3) only
(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.
C.
(1) only
(1) and (2) only
B.
D.
(3) only
(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.
B.
C.
D.
It will form an anion At -.
It will exist as a solid at room temperature.
It will be readily soluble in water.
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.
C.
8.
20.
B.
D.
16.
22.
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.
B.
C.
D.
is a liquid at room temperature.
conducts electricity when it is in the molten state.
has a formula A2B.
is insoluble in water.
87 Q.3
In which of the following pairs would both members have the same electronic configuration?
A.
C.
O2-, F
Na, Mg2+
B.
D.
87 Q.32
Nitrogen does not react readily with other
elements or compounds.
1st statement
A.
True
B.
True
C.
True/False
D.
False
2nd statement
True
True
False/True
False
Ne, Na+
S, ClThe outermost electron shell of the nitrogen
atom is completely filled.
2nd statement is a correct explanation of the 1st one.
2nd statement is NOT a correct explanation of the 1st one.
Only ONE of the statements is true, the other is false.
-----
87 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.
C.
(1) only
(1) and (3) only
B.
D.
(1) and (2) only
(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.
B.
C.
D.
11 neutrons and 12 protons.
12 neutrons and 11 protons.
12 neutrons and 23 protons.
23 neutrons and 11 protons.
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.
C.
B.
D.
CCl4
H2S
NH3
CO2
89. Q.1
With reference to the data given in the table:
Element
Atomic number
Mass Number
X
12
24
Y
9
19
The relative molar mass of the compound formed between X and Y is
A.
C.
21.
62.
B.
D.
43.
67.
89 Q.3
Solid lead (II) bromide is a non-conductor of electricity because
A.
B.
C.
D.
it is a covalent compound.
it is not soluble in water.
the lead and bromide ions are not freely moving.
lead conducts electricity but bromine does not.
89 Q.28
Graphite is a rather soft substance.
A.
B.
C.
D.
1st statement
True
True
True/False
False
2nd statement
True
True
False/True
False
All the bonds between the carbon atoms in
graphite are weak.
2nd statement is a correct explanation of the 1st one.
2nd statement is NOT a correct explanation of the 1st one.
Only ONE of the statements is true, the other is false.
-----
89 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.
C.
(1) and (4) only
(1), (2) and (3) only
B.
D.
(2) and (3) only
(2), (3) and (4) only
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
(for N2)
N
2-
(2)
(3)
A.
C.
(for S2-)
S
O
C
O
(1) only
(2) and (3) only
(for CO2)
B.
D.
(1) and (2) only
(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.
C.
19.
25.
B.
D.
23.
30.
90 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.
C.
XY2.
X2Y3.
B.
D.
X2Y.
X3Y2.
90 Q.4
Which of the following combinations concerning the isotopes of an element is correct?
A.
B.
C.
D.
No.of protons
same
same
different
same
No. of neutrons
different
same
same
different
No. of electrons
same
different
different
different
90 Q.25
Bromine has a low melting point because
A.
B.
C.
D.
it is a non-metal.
it is member of the halogen family.
the atoms in each bromine molecule are bonded together by a covalent bond.
the bromine molecules are attracted together by van der Waals’ forces.
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.
B.
C.
D.
it is a non-electrolyte.
it exists as molecules.
its ions are not mobile.
metallic bonding is not present.
Directions: Question 91 Q.1 and 91 Q.2 refer to the following table.
Element
W
X
Y
Atomic number
4
8
14
Z
20
91 Q.1
Which of the following elements are likely to be metals?
A.
C.
W and X
X and Y
B.
D.
W and Z
Y and Z
91 Q.2
The formula of the compound formed between X and Z is likely to be
A.
C.
XZ.
X2Z.
B.
D.
XZ2.
X2Z3.
91 Q.4
Which of the following groups of ions / atoms has the same number of electrons?
A.
C.
K+, Ca2+
H+, He
B.
D.
Cl-, S
O2-, Ar
92 Q.2
X and Y are elements. The melting points of their chlorides are given below:
Melting point (oC)
Chloride of X
772
Chloride of Y
-68
Which of the following statements is correct?
A.
B.
C.
D.
Both X and Y are metals.
The chloride of Y is a solid at room temperature.
The chloride of X conducts electricity in the solid state.
The chloride of Y is a covalent compound.
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.
B.
F
F
N
N
O
C.
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?
A.
B.
C.
D.
Number of protons
8
8
9
9
Number of neutrons
9
17
8
17
92 Q.33
Which of the following ions is / are coloured?
(1) Pb2+(aq)
(2) Cr3+(aq)
(3) MnO4-(aq)
A.
C.
(1) only
(1) and (2) only
92 Q.45
Both zinc and molten sodium chloride
conduct electricity.
1st statement
A.
True
B.
True
C.
True/False
D.
False
2nd statement
True
True
False/True
False
B.
D.
(3) only
(2) and (3) only
Both zinc and molten sodium chloride
contains mobile ions.
2nd statement is a correct explanation of the 1st one.
2nd statement is NOT a correct explanation of the 1st one.
Only ONE of the statements is true, the other is false.
-----
93 Q.1
Which of the following pairs of atoms / ions has the same number of electrons?
A. Mg2+ and F
B. Cl- and Ne
C. K+ and O2D. Cl- and S2-
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.
B.
C.
D.
Their melting points increase.
Their ability to gain electrons increase.
Their oxides change from acidic to basic.
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.
C.
12.
17.
B.
D.
13.
18.
93 Q.7
CO2(g) + CaCO3(x) + H2O(y) → Ca(HCO3)2(z)
In the above chemical equation, which of the following combinations is correct?
x
aq
s
s
s
A.
B.
C.
D.
y
l
aq
l
l
z
aq
s
s
aq
94 Q.1
If the atomic number of an element X is 13, the formula of its oxide is
A.
C.
XO2.`
X2O3.
B.
D.
XO3.
X3O2.
94 Q.2
Consider the information given in the table below:
Atom
Atomic number
Mass number
P
6
14
Q
7
14
R
13
S
18
T
10
Which of the following atoms are isotopes?
A. P and Q
B.
P and R
C. R and S
D.
S and T
No. of neutrons
7
10
10
Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.10
94 Q.3
Which of the following molecules has the greatest number of lone pairs of electrons?
A.
C.
fluorine
nitrogen
B.
D.
hydrogen
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
C. yellow
B.
D.
purple
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.
Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.11
94 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
Y
X
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.
C.
(1) and (2) only
(2) and (3) only
B.
D.
(1) and (3) only
(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.
C.
(1) and (2) only
(2) and (3) only
B.
D.
94 Q.46
Hydrogen chloride has a lower melting
point than sodium chloride.
1st statement
A.
True
B.
True
C.
True/False
D.
False
2nd statement
True
True
False/True
False
(1) and (3) only
(1), (2) and (3)
In each molecule of hydrogen chloride, a
hydrogen atom and a chlorine atom are
joined together by a covalent bond.
2nd statement is a correct explanation of the 1st one.
2nd statement is NOT a correct explanation of the 1st one.
Only ONE of the statements is true, the other is false.
-----
Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.12
95 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.
B.
C.
D.
18 protons, 22 neutrons and 18 electrons.
18 protons, 22 neutrons and 22 electrons.
18 protons, 40 neutrons and 18 electrons.
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.
C.
MgX
Mg2X3
B.
D.
MgX2
Mg3X2
95 Q.3
Which of the following correctly describes the structure of quartz?
A.
B.
C.
D.
giant covalent structure
giant ionic structure
giant metallic structure
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
19.7%
5B
80.3%
B
The relative atomic mass of boron (correct to 1 decimal place) is
11
5
A.
B.
C.
D.
10.4.
10.6.
10.8.
11.0.
Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.13
95 Q.26
Which of the following elements is a semi-metal?
A.
B.
C.
D.
Hg
Si
C
Be
95 Q.34
Which of the following particles is / are present in a hydrogen ion?
(1) proton
(2) neutron
(3) electron
A.
C.
(1) only
(1) and (3) only
B.
D.
(2) only
(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.
C.
(1) and (2) only
(2) and (3) only
B.
D.
(1) and (3) only
(1), (2) and (3)
96 Q.1
Magnesium can calcium have similar properties because
A.
B.
C.
D.
their atoms have the same atomic structure.
their atoms have the same number of electron shells.
their atoms have the same number of electrons in their outermost shells.
their atoms have the same electronic arrangement.
96 Q.2
Which of the following can represent the electronic structure of potassium sulphide?
A.
2-
+
K
C.
2
2S
2-
+
2
S
2+
K
B.
K
S
D.
K
S
Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.14
96 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.
C.
10
14
B.
D.
13
17
96 Q.44
Which of the following elements can react together to form a covalent compound?
(1) argon
(2) nitrogen
(3) oxygen
(4) calcium
A.
C.
(1) and (2) only
(2) and (3) only
B.
D.
96 Q.45
The melting point of hydrogen chloride is
lower than that of potassium chloride.
1st statement
A.
True
B.
True
C.
True/False
D.
False
2nd statement
True
True
False/True
False
2nd statement
True
True
False/True
False
Hydrogen chloride is a covalent compound
whereas potassium chloride is an ionic
compound.
2nd statement is a correct explanation of the 1st one.
2nd statement is NOT a correct explanation of the 1st one.
Only ONE of the statements is true, the other is false.
-----
96 Q.50
Both dry ice and quartz exist in the form of
discrete molecules.
1st statement
A.
True
B.
True
C.
True/False
D.
False
(1) and (4) only
(3) and (4) only
Carbon and silicon atoms have the same
number of electrons in their outermost
shells.
2nd statement is a correct explanation of the 1st one.
2nd statement is NOT a correct explanation of the 1st one.
Only ONE of the statements is true, the other is false.
-----
97 Q.1
The chemical properties of an element depend on
A.
B.
C.
D.
its relative atomic mass.
the number of isotopes of the element.
the number of electron shells in its atoms.
the number of outermost shell electrons in its atoms.
Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.15
97 Q.2
Elements X and Y form a compound having the following electronic structure:
2+
-
Y
X
Y
(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
97 Q.3
Argon exists as a gas room temperature and pressure because
A.
B.
C.
D.
argon molecules are monoatomic.
argon is chemically inert.
the outermost electron shell of an argon atom has an octet structure.
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.
Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.16
97 Q.30
M is an element in the third period of the Periodic Table. M forms a sulphate which has the
formula M2(SO4)3. The formula of the nitrate of M is
A.
C.
MNO3.
M(NO3)3.
B.
D.
M(NO3)2.
M2(NO3)3.
98 Q.1
An element X exists as molecules. X has an atomic number of 7 and a molecule of X has a
formula
X2. Which of the following can represent the electronic structure of X2?
A.
B.
C.
D.
98 Q.2
The formula for ozone is 03. 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.
B. 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.
Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.17
98 Q. 18
Which of the following ions has the same number of protons as the hydroxide ion, OH− ?
A.
C.
O2Na+
B.
D.
FMg2+
98 Q.33
Consider the following information:
Which of the above substances exists as a simple molecular solid at room temperature?
A.
C.
B.
D.
W
Y
98 Q.46
Element X (atomic number 11) reacts with
element Y (atomic number 16) to form an
ionic compound.
A.
B.
C.
D.
1st statement
True
True
True/False
False
2nd statement
True
True
False/True
False
X
Z
Each atom of X loses one electron and each
atom of Y accepts two electrons to form a
compound with formula X2Y.
2nd statement is a correct explanation of the 1st one.
2nd statement is NOT a correct explanation of the 1st one.
Only ONE of the statements is true, the other is false.
-----
99 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.)
Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.18
99 Q.2
One mole of calcium bromide contains
A.
C.
1 mole of molecules.
2 moles of cations.
B.
D.
2 moles of cations.
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?
A.
B.
C.
D.
X
1
1
2
3
Y
3
5
8
5
99 Q.5
Consider the information concerning particle X and particle Y listed below:
Particle
X
Y
Number of protons
16
16
Number of electrons Number of neutrons
16
18
18
18
Which of the following statement is correct?
A.
B.
C.
D.
X and Y are atoms of the same element.
X and Y are atoms of different elements.
X is a cation of Y.
Y is an anion of X.
99 Q.10
Which of the following statements concerning bromine and chlorine is INCORRECT?
A.
B.
C.
D.
They exist as diatomic molecules.
Their atoms have the same number of outermost shell electrons.
They form ions with a single negative charge.
Bromine is a stronger oxidizing agent than chlorine.
Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.19
99 Q.11
The table below shows the ability of four substances W, X, Y, and Z to conduct electricity.
(In the table, 9 and X respectively represent ‘can conduct electricity’ and ‘cannot
conduct electricity’.)
Substance
W
X
Y
Z
Solid State
X
X
X
9
Liquid State
9
X
X
9
Aqueous Solution
9
9
X
(insoluble in water)
Which of the substances is likely to be zinc chloride?
A.
C.
W
Y
B.
D.
X
Z
99 Q.13
Which of the following ions is responsible for the yellow colour of topaz?
A.
C.
Ni2+
Cr3+
B.
D.
Fe3+
Mn3+
99 Q.17
The compound X2S contains 58.9% of X by mass. What is the relative atomic mass of X?
(Relative atomic mass : S = 32.1)
A.
C.
11.5
39.0
B.
D.
23.0
46.0
99 Q.19
Ionic compound X has the formula AB2, where A and B represent the cation and anion
respectively. If both A and B have the same electronic arrangement, X may be
A.
C.
potassium sulphide.
silicon dioxide.
B.
D.
magnesium fluoride.
calcium bromide.
99 Q.21
Consider the following chemical equation:
2HNO3 + xFeSO4 + yH2SO4 → zFe2(SO4)3 + 4H2O + 2NO
Which of the following combinations is correct?
Y
Z
X
A. 2
1
1
B. 4
3
2
C. 6
2
3
D. 6
3
3
Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.20
99 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.
C.
(1) only
(1) and (3) only
B.
D.
(2) only
(2) and (3) only
99 Q.39
Element X has an isotope31
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.
C.
(1) only
(1) and (3) only
B.
D.
(2) only
(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.
C.
(1) and (2) only
(2) and (3) only
B.
D.
(1) and (3) only
(1), (2) and (3)
Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.21
99 Q.46
Metals have good thermal conductivity.
1st statement
A.
True
B.
True
C.
True/False
D.
False
2nd statement
True
True
False/True
False
Metals are composed of giant lattices of
positive ions surrounded by valence
electrons which are free to move
throughout the lattices.
2nd statement is a correct explanation of the 1st one.
2nd statement is NOT a correct explanation of the 1st one.
Only ONE of the statements is true, the other is false.
-----
00 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.
C.
2
6
B.
D.
4
8
00 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.
B.
C.
D.
Caesium is a weaker reducing agent than potassium.
Caesium reacts violently with water.
Caesium is a soft metal.
Caesium reacts with oxygen to form an oxide with formula Cs2O.
00 Q.7
Element X occurs in nature as two isotopes, 63X and 65X. If the relative atomic mass of X is
63.5, what is the relative abundance of the 63X isotope?
A.
C.
25%
75%
B.
D.
60%
90%
00 Q.9
The atomic number of element X is 12. X reacts with element Y to form an ionic compound
with formula XY2. To which group of the Periodic Table does Y belong?
A. Group I
B.
Group IV
C. Group VI
D.
Group VII
Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.22
00 Q.12
Which of the following natural substances is essentially a single compound?
A.
C.
Air
petroleum
B.
D.
coal
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.
C.
an ionic structure.
a simple molecular structure.
B.
D.
a metallic structure.
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.
C.
(1) only
(1) and (3) only
B.
D.
(2) only
(2) and (3) only
00 Q.39
X is an element in Group VI of the Periodic Table. X can form X2- ions. Which of the following
statements are correct?
(1) The oxidation number of X decreases when X2 - ion is formed.
(2) Both X atom and X2- ion have the same number of electron shells.
(3) Both X atom and X2- ion have the same nuclear charge.
A.
C.
(1) and (2) only
(2) and (3) only
B.
D.
(1) and (3) only
(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.
C.
(1) and (2) only
(2) and (3) only
B.
D.
(1) and (3) only
(1), (2) and (3)
Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.23
00 Q.46
Carbon dioxide and silicon dioxide have
similar physical properties.
1st statement
A.
True
B.
True
C.
True/False
D.
False
2nd statement
True
True
False/True
False
The atoms of carbon and silicon have the same
number of electrons in their outermost shells.
2nd statement is a correct explanation of the 1st one.
2nd statement is NOT a correct explanation of the 1st one.
Only ONE of the statements is true, the other is false.
-----
01 Q.1
Which of the following ions is responsible for the yellow colour of topaz?
A.
C.
Mn2+
Fe2+
B.
D.
Mn3+
Fe3+
B.
D.
evaporation of ethanol
dissolving sodium hydroxide pellets in
water
01 Q.3
Which of the following processes is exothermic?
A.
C.
melting of ice
sublimation of iodine
01 Q.5
Which of the following substances can conduct electricity in both solid and liquid states?
A.
C.
sulphur
quartz
B.
D.
mercury
lead(II) bromide
01 Q.8
Which of the following statements concerning the formation of chloride ions from chlorine
atoms is correct?
A.
B.
C.
D.
The number of shells occupied by electrons in a chlorine atom equals that in a chloride
ion.
The atomic number of chlorine increases by 1.
The mass number of chlorine increases by 1.
The change is an oxidation.
Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.24
01 Q.18
Consider the following information about four substances, W, X, Y and Z:
Substance
Melting Point/℃
W
X
Y
Z
-23
56
232
750
Electrical conductivity at
room temperature
poor
poor
good
poor
Which substance has a simple molecular structure and is a solid at room temperature?
A.
C.
W
Y
B.
D.
X
Z
01 Q.20
The table below lists some information about two elements, X and Y:
Element
X
Y
Atomic number
12
9
Relative atomic mass
24.0
19.0
The compound formed from X and Y has a formula mass of
A.
C.
43.0
67.0
B.
D.
62.0
81.0
01 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.
C.
17.7
35.4
B.
D.
25.1
40.8
01 Q.37
Consider the information listed below:
(1)
(2)
(3)
Substance
helium
diamond
magnesium oxide
Attraction between particles in substance
van der Waals’ forces
covalent bond
ionic bond
Which of the following combinations are correct?
A.
C.
(1) and (2) only
(2) and (3) only
B.
D.
(1) and (3) only
(1), (2) and (3)
Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.25
01 Q.42
Which of the following ions have the same number of electrons as a neon atom?
(1)
(2)
(3)
A.
C.
Mg2+
O2Cl-
(1) and (2) only
(2) and (3) only
01 Q.49
Lithium is the most reactive element
in Group 1 of the Periodic Table.
1st statement
A.
True
B.
True
C.
True/False
D.
False
2nd statement
True
True
False/True
False
B.
D.
(1) and (3) only
(1), (2) and (3)
Among the Group 1 elements,
lithium loses electrons most readily.
2nd statement is a correct explanation of the 1st one.
2nd statement is NOT a correct explanation of the 1st one.
Only ONE of the statements is true, the other is false.
-----
02 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.
C.
7
17
B.
D.
15
19
02 Q.2
Which of the following compounds, when dissolved in water, gives a green solution?
A.
C.
copper(II) sulphate
cobalt(II) chloride
B.
D.
nickel(II) sulphate
iron(III) sulphate
02 Q.3
An oxide of element X has the formula X2O3. 0.2 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.
C.
12.0
27.0
B.
D.
18.0
36.0
Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.26
02 Q.28
Which of the following substances does not conduct electricity in its solid state but does
conduct electricity in its liquid state?
A.
C.
lithium chloride
platinum
B.
D.
phosphorus
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 CaF2.
A.
C.
(1) only
(1) and (3) only
B.
D.
(2) only
(2) and (3)
02 Q.45
Nitrogen monoxide is a gas at room
temperature and pressure.
Nitrogen monoxide is a covalent compound.
02 Q.46
Combustion of diamond gives carbon
dioxide.
Diamond is a crystalline form of carbon.
02 Q.49
When iodine sublimes, it absorbs energy.
1st statement
A.
True
B.
True
C.
True/False
D.
False
2nd statement
True
True
False/True
False
Energy is required to overcome the attractive
force between iodine molecules.
2nd statement is a correct explanation of the 1st one.
2nd statement is NOT a correct explanation of the 1st one.
Only ONE of the statements is true, the other is false.
-----
03 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?
A.
B.
C.
D.
Group I
lithium
lithium
potassium
potassium
Group VII
fluorine
iodine
fluorine
iodine
Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.27
03 Q.2
Which of the following substances, upon heating in a test tube, would undergo a chemical
change?
A.
C.
water
sodium chloride
B.
D.
calcium oxide
hydrated copper(II) sulphate
03 Q.7
Which of the following statements concerning halogens is INCORRECT?
A.
B.
C.
D.
Compounds of fluorine are added to tap water to help prevent tooth decay.
Chlorine is used as a sterilizing agent.
Bromine is a volatile liquid.
Iodine vapour is brown in colour.
03 Q.12
Gallium (Ga) occurs naturally in two isotopic forms, 69Ga and 71Ga. 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.
C.
69.6
70.0
B.
D.
69.8
70.2
03 Q.14
Which of the following statements about carbon dioxide is correct?
A.
B.
C.
D.
Solid carbon dioxide has a covalent network structure.
Carbon dioxide is used to put out electrical fire.
Carbon dioxide is used in filling weather balloons.
Carbon dioxide dissolves in water to give a solution which is slightly alkaline.
Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.28
03 Q.23
Consider the following equation:
5H2S(g) + 2KMnO4(aq) + 3H2SO4(aq) → 5S(x) + 8H2O(y) + 2MnSO4(z) + K2SO4(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.
C.
XY2
X2Y5
B.
D.
X2Y3
X3Y2
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.
C.
50.0 g of neon
50.0 g of hydrogen chloride
B.
D.
50.0 g of oxygen
50.0 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.
C.
(1) only
(1) and (3) only
B.
D.
(2) only
(2) and (3)
03 Q.42
Iron pyrite (FeS2) 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.
C.
(1) and (2) only
(2) and (3) only
B.
D.
(1) and (3) only
(1), (2) and (3)
Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.29
03 Q.46
35
Cl and 37Cl have the same chemical
properties.
1st statement
A.
True
B.
True
C.
True/False
D.
False
2nd statement
True
True
False/True
False
The number of electrons in the outermost shell
of a 35Cl atom is equal to that of a 37Cl atom.
2nd statement is a correct explanation of the 1st one.
2nd statement is NOT a correct explanation of the 1st one.
Only ONE of the statements is true, the other is false.
-----
Element and atomic structure / Section 1 / Sect1pp.doc / S. W. Tse / P.30
M.C. Answer
85
1
3
4
7
29
36
94
1
2
3
6
7
36
37
46
03
1
2
7
12
14
23
25
28
32
42
46
B
B
D
D
C
B
C
B
A
C
A
A
D
B
86
2
9
11
37
38
43
44
48
95
1
2
3
4
26
34
39
B
A
B
C
D
B
D
C
A
D
A
C
B
A
A
87
1
2
3
32
40
96
1
2
3
44
45
50
C
B
B
C
C
C
B
A
C
B
C
88
2
3
97
1
2
3
5
30
B
C
D
B
D
C
C
89
1
3
28
33
34
98
1
2
6
18
33
46
C
C
C
B
B
D
B
D
B
B
C
90
2
3
4
25
26
99
1
2
4
5
10
11
13
17
19
21
34
39
42
46
D
C
A
D
C
B
C
B
D
D
A
B
B
B
D
D
C
D
A
91
1
2
4
00
1
2
7
9
12
17
34
39
42
46
B
A
A
B
A
C
D
D
B
D
D
D
C
92
2
3
30
33
45
01
1
3
5
8
18
20
26
37
42
49
D
C
A
D
C
D
D
B
A
B
B
C
D
A
D
93
1
2
4
7
D
B
C
D
02
1
2
3
28
36
45
46
49
C
B
C
A
D
B
A
A