NSS Chemistry Part 2 Microscopic World I _MC
Transcript of NSS Chemistry Part 2 Microscopic World I _MC
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NSS Chemistry Part 2 The
HKCEE Past Paper Questio
1. 1995 Q1
The atomic number of an element
A. 18 protons, 22 neutrons and 18
B. 18 protons, 22 neutrons and 22
C. 18 protons, 40 neutrons and 18
D. 22 protons, 22 neutrons and 18
2. 1995 Q2
The electronic structure of a comp
(Only electrons in the outermost sh
What would be the formula of the
A. MgX
B. MgX2
C. Mg2X3
D. Mg3X2
3. 1995 Q3
Which of the following correctly d
A. giant covalent structure
B. giant ionic structure
C. giant metallic structure
D. simple molecular structure
4. 1995 Q4Boron consists of two isotopes. Th
Isotope Relative abundanc
10
5 B19.7%
11
5 B80.3%
The relative atomic mass of boron
A. 10.4.
B. 10.6.
C.
10.8.D. 11.0.
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icroscopic World I
s Multiple Choice Questions
is 18. An atom of X has a mass number of 40.
electrons.
electrons.
electrons.
electrons.
und formed between an element X and chlorine i
ells are shown.)
ompound formed between X and magnesium?
scribes the structure of quartz?
table below lists the relative abundance of these
correct to 1 decimal place) is
he atom has
Ans: A
s shown below.
Ans: D
Ans: A
two isotopes.
Ans: C
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5. 1995 Q24
Consider the following equation.
2FeSO47H2O(x)Fe2O3(y)+ SO3(z)+ SO2(g)+ 14H2O(l)
Which of the following combinations is correct?
x y z
A. aq s g
B. aq s l
C. s aq s
D. s s g
Ans: D
6. 1995 Q26
Which of the following elements is a semi-metal?
A. Hg
B. Si
C.
C
D. Be
Ans: B
7. 1995 Q32
Astatine is a Group VII element below iodine in the Periodic Table. Which of the following statements
concerning astatine is/are correct?
(1) It is a liquid at room temperature and pressure.
(2)
It reacts with sodium to form an ionic compound.
(3) It is a stronger oxidizing agent than iodine.
A. (1) only
B. (2) only
C. (1) and (3) only
D. (2) and (3) only
Ans: B
8. 1995 Q34Which 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
Ans: A
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9. 1995 Q39
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)
Ans: A
10. 1996 Q1
Magnesium and calcium have similar chemical 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.
Ans: C
11. 1996 Q2
Which of the following can represent the electronic structure of potassium sulphide?
A.
B.
C.
D.
Ans: B
12. 1996 Q3
The mass number of atomXis 27.Xforms 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. 17
Ans: A
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13. 1996 Q4
Consider the following chemical equation:
2HNO3(aq)+ CaCO3(x)Ca(NO3)2(y)+ H2O(z)+ CO2(g)
Which of the following combinations is correct?
x y z
A. aq aq l
B. aq aq aq
C. s aq l
D. s s aq
Ans: C
14. 1996 Q39
The atomic number of elementXis 16. Which of the following statements concerningXare correct?
(1)Xcan react with calcium to form an ionic compound.
(2)
The oxide ofXdissolves in water to form an acidic solution.
(3)Xcan conduct electricity in its molten state.
A. (1) and (2) only
B. (1) and (3) only
C. (2) and (3) only
D. (1), (2) and (3)
Ans: A
15. 1996 Q42
X is an element. It can form a cation X2+
which has an electronic arrangement 2, 8, 8. Which of the following
statement concerning X are correct?
(1) X is a strong oxidizing agent.
(2) X is in Period 4 of the Periodic Table.
(3) X burns in oxygen with a brick red flame.
A.
(1) and (2) onlyB. (1) and (3) only
C. (2) and (3) only
D. (1), (2) and (3)
Ans: C
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16. 1996 Q44
Which of the following elements c
(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
17. 1997 Q1
The chemical properties of an elem
A. its relative atomic mass.
B.
the number of isotopes of the e
C. the number of electron shells i
D. the number of outermost shell
18. 1997 Q2
Elements X and Y form a compoun
(Only outermost shell electrons are
Which of the following combinatio
X Y
A. Na S
B. Mg Br
C. Al Cl
D. Si O
19. 1997 Q3
Argon exists as a gas at room temp
A. argon molecules are monoatom
B. argon is chemically inert.
C. the outermost electron shell of
D. the attractive force between ar
5
n react together to form a covalent compound?
ent depend on
lement.
its atoms.
lectrons in its atoms.
d having the following electronic structure :
shown.)
ns is correct?
rature and pressure because
ic.
an argon atom has an octet structure.
on atoms is weak.
Ans: C
Ans: D
Ans: B
Ans: D
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20. 1997 Q4
Which of the following statements
A. Both sulphur and chlorine can
B. Magnesium is a stronger reduci
C. Phosphorus and chlorine form
D. Magnesium burns in oxygen to
21. 1997 Q5
Which of the following diagrams b
(In these diagram, represent Na+i
A.
B.
22. 1997 Q10
Which of the following combinatio
Chemical
A. calcium
B. potassium
C. ethanol
D. potassium permanganate soluti
23. 1997 Q27
Consider the following chemical e
O2(g)+ 4Fe(OH)2(x)2Fe2
Which of the following combinatio
x y z
A. s s l
B. s aq aq
C. aq s aq
D. aq aq l
6
concerning the elements in the third period of th
e reduced by aqueous sodium sulphite.
ng agent than sodium.
covalent compound.
form an acidic oxide.
st represents a part of the giant lattice of sodium
on and o represent Clion.)
C.
D.
ns in INCORRECT?
Method of storage
under water
under paraffin oil
in a cool place
on in a brown bottle
uation :
O3(y)+ 4H2O(z)
ns is correct?
Periodic Table is correct?
Ans: C
chloride crystal?
Ans: B
Ans: A
Ans: A
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24. 1997 Q30
M is an element in the third period of the Periodic Table. M forms a sulphate which has the formula M 2(SO4)3.
The formula of the nitrate of M is
A. MNO3.
B. M(NO3)2.
C. M(NO3)3.
D. M2(NO3)3.
Ans: C
25. 1998 Q1
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 X2?
A. B.
C. D.
Ans: D
26. 1998 Q2
The formula for ozone is O3. If one mole of ozone contains x atoms, how many atoms will one mole of oxygen
gas contain?
A.3
x
B.3
2x
C.2
3x
D. x3 Ans: B
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27. 1998 Q4-5
Directions: Questions 27 and 28 r
The circuit shown below is set up a
Which of the following statements
A. The bulb lights up.
B.
A reddish brown gas is liberate
C. ElectrodesXand Ycan be mad
D. Oxidation occurs at electrode
28. 1998
Which of the following can be ded
A. Solid lead(II) bromide contains
B.
Molten lead(II) bromide contai
C. Molten lead(II) bromide can b
D. Solid lead(II) bromide is a cov
29. 1998 Q6
A part of the Periodic Table is sho
Which of the following statements
A. The outermost electron shell o
B. The metallic character of the P
C. c forms an ionic compound wit
D. eis a strong oxidizing agent.
8
fer to the following experiment:
nd the solid lead(II) bromide is heated until it be
concerning the experiment is INCORRECT?
d at electrodeX.
of nichrome.
.
ced from the experimental result?
mobile ions.
ns delocalized electrons.
decomposed by electricity.
lent compound but molten lead(II) bromide is a
n below.
is correct?
an atom of ais an octet structure.
riod 2 elements increases from bto d.
hd.
omes molten.
Ans: B
ionic compound.
Ans: C
Ans: D
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30. 1998 Q18
Which of the following ions has the same number of protons as the hydroxide ion, OH?
A. O2
B. F
C. Na+
D. Mg2+
Ans: B
31. 1998 Q27
Consider the following chemical equation :
Zn +pMnO2+ qNH4+Zn
2++xMn2O3+yNH3+zH2O
Which of the following combinations is correct?
x y z
A. 1 2 1
B. 1 3 2
C. 2 3 2
D. 2 2 3
Ans: A
32. 1998 Q33
Consider the following information :
Substance Melting point / oC
Electrical conductivity
at room temperature
Solubility
in water
W 34 poor slightly soluble
X 44 poor insoluble
Y 232 good insoluble
Z 782 poor very soluble
Which of the above substances exists as a simple molecules solid at room temperature?
A. W
B. X
C.
Y
D. Z
Ans: B
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33. 1998 Q44
Upon heating, a mixture of iron
concerning the black substance are
(1) It is insoluble in water.
(2) It can be attracted by a bar ma
(3) It reacts with dilute hydrochlor
A. (1) and (2) only
B. (1) and (3) only
C. (2) and (3) only
D. (1), (2) and (3)
34. 1999 Q1
Which of the following diagrams c
(In these diagrams, and re
A. B
C. D
35. 1999 Q2
One mole of calcium bromide cont
A. 1 mole of molecules.
B.
2 moles of cations.C. 2 moles of anions.
D. 3 moles of atoms.
36. 1999 Q3
Which of the following substances
A. ethanol
B. propan-1-ol
C. propane
D. butane
10
and sulphur gives a black substance. Which
correct?
net.
ic acid to give a gas with a pungent smell.
n represent a mixture of two compounds?
present a nitrogen atom and an oxygen atom resp
.
.
ins
has the lowest boiling point?
f the following statements
Ans: B
ectively.)
Ans: B
Ans: C
Ans: C
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37. 1999 Q4
Element X and element Y belon
between these two elements has th
(Only outermost shell electrons are
How many electrons are there in th
X Y
A. 1 3
B. 1 5
C. 2 8
D. 3 5
38. 1999 Q5
Consider the information concerni
Particle Number of protons
X 16
Y 16
Which of the following statements
A. Xand Yare atoms of the same
B. Xand Yare atoms of different
C. X is a cation of Y.
D. Y is an anion ofX.
39. 1999 Q10
Which of the following statements
A. They exist as diatomic molecul
B. Their atoms have the same nu
C. They formed ions with a single
D. Bromine is a stronger oxidizin
11
to the first three periods of the Periodic Ta
following electronic structure:
shown.)
e outermost shell of an atom of X and that of Y?
g particleXand particle Ylisted below:
Number of electrons Number of neutrons
16 18
18 18
is correct?
lements.
lements.
concerning bromine and chlorine is INCORRE
es.
ber of outermost shell electrons.
negative charge.
agent than chlorine.
le. The compound formed
Ans: B
Ans: D
T?
Ans: D
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40. 1999 Q11
The table below shows the ability of four substances W,X, YandZto conduct electricity.
(In the table, and respectively represent can conduct electricity and cannot conduct electricity.)
Substance Solid State Liquid State Aqueous Solution
W
X
Y
Z (insoluble in water)
Which of the substances is likely to be zinc chloride?
A. W
B. X
C. Y
D. Z
Ans: A
41. 1999 Q19
Ionic compoundXhas the formula AB2, where A and B represent the cation and anion respectively. If both A
and B have the same electronic arrangement,Xmay be
A. potassium sulphide.
B. magnesium fluoride.
C. silicon dioxide.
D. calcium bromide.
Ans: B
42. 1999 Q21
Consider the following chemical equation:
2HNO3+ xFeSO4+ yH2SO4zFe2(SO4)3+ 4H2O + 2NO
Which of the following combinations is correct?
x y z
A. 2 1 1
B. 4 3 2
C. 6 2 3
D. 6 3 3
Ans: D
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43. 1999 Q34
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 gaint 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
Ans: D
45. 1999 Q39
Element X has an isotope X31
15 . 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) X31
15 has 16 neutrons.
A. (1) only
B.
(2) only
C. (1) and (3) only
D. (2) and (3) only
Ans: C
46. 2000 Q1
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. 8
Ans: B
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47. 2000 Q2
Caesium (Cs) is a Group I element in the Periodic Table and it relative atomic mass is greater than that of
potassium. Which of the following statements concerning caesium in INCORRECT?
A. Caesium is a weaker reducing agent than potassium.
B. Caesium reacts violently with water.
C. Caesium is a soft metal.
D. Caesium reacts with oxygen to form an oxide with formula Cs2O.
Ans: A
48. 2000 Q7
Element X occurs in nature as two isotopes,63
X and65
X. If the relative atomic mass of X is 63.5, what is the
relative abundance of the63
X isotope?
A. 25%
B. 60%
C.
75%
D. 90%
Ans: C
49. 2000 Q9
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
Ans: D
50. 2000 Q16
Consider the following equation:
3Zn(s)+ 2NO3
(aq)+ 8H+
(aq)3Zn2+
(x)+ 2NO(y) + 4H2O(z)
Which of the following combinations is correct?x y z
A. aq g aq
B. aq g l
C. aq aq l
D. l g aq
Ans: B
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51. 2000 Q17
The melting point and boiling point of substance Xand 321oC and 765
oC respectively. In its molten state, X
conducts electricity without decomposition.Xprobably has
A. an ionic structure
B. a metallic structure.
C. a simple molecular structure.
D. a covalent network structure.
Ans: B
52. 2000 Q34
Which of the following statement 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
Ans: D
53. 2000 Q39
X is an element in Group VI of the Periodic Table. X can form X2ions. Which of the following statement 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. (1) and (2) only
B. (1) and (3) only
C.
(2) and (3) onlyD. (1), (2) and (3)
Ans: D
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54. 2000 Q42
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)
Ans: D
55. 2001 Q5
Which of the following substances can conduct electricity in both solid and liquid states?
A.
sulphur
B. mercury
C. quartz
D. lead(II) bromide
Ans: B
56. 2001 Q18
Consider the following information about four substances, W,X, YandZ:
Substance Melting Point/oC 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 termperature?
A. W
B. X
C. Y
D. Z
Ans: B
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57. 2001 Q20
The table below lists some information about two elements,Xand Y:
Element Atomic number Relative atomic mass
X 12 24.0
Y 9 19.0
The compound formed fromXand Yhas a formula mass ofA. 43.0
B. 62.0
C. 67.0
D. 81.0
Ans: B
58. 2001 Q24
Consider the half equation:
IO3(aq)+ xH2O(l)+ ye
I
(aq)+ zOH
(aq)
Which of the following combinations is correct?
x y z
A. 1 2 2
B. 2 4 4
C. 3 6 6
D. 4 8 8
Ans: C
59. 2001 Q37
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)
Ans: D
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60. 2001 Q42
Which of the following ions have the same number of electrons as a neon atom?
(1) Mg2+
(2) O2
(3) Cl
A. (1) and (2) only
B. (1) and (3) only
C. (2) and (3) only
D. (1), (2) and (3)
Ans: A
61. 2002 Q1
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. 19.
Ans: C
62. 2002 Q28
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
Ans: A
63. 2002 Q29
In which of the following substances are the molecules furthest apart from each other at room temperature and
pressure?
A. butane
B. water
C. propan-1-ol
D. iodine
Ans: A
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64. 2002 Q36
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. (1) only
B. (2) only
C. (1) and (3) only
D. (2) and (3) only
Ans: D
65. 2003 Q1
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
Ans: C
66. 2003 Q12
Gallium (Ga) occurs naturally in two isotopic forms,69
Ga and71
Ga. The table below lists the relative
abundance of each isotope.
Isotope Relative abundance
69Ga 60.2%
71Ga 39.8%
What is the relative atomic mass of gallium?
A. 69.6
B. 69.8
C. 70.0
D.
70.2
Ans: B
67. 2003 Q14
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.
Ans: B
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68. 2003 Q18
Consider the following information about three elements,X, YandZ.
Element Atomic number
X 12
Y 16
Z 17
Which of the following statement concerningX, YandZis correct?
A. Xreacts withZto form an ionic compound.
B. Yis a stronger oxidizing agent thanZ.
C. Xhas a simple molecular structure.
D. Ycan conduct electricity in the molten state.
Ans: A
69. 2003 Q23
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
Ans: B
70. 2003 Q25
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. XY2
B. X2Y3
C.
X2Y5
D. X3Y2
Ans: D
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71. 2003 Q32
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) only
Ans: D
72. 2004 Q1
How many elements does ammonium dichromate consist of?
A. 2
B. 3
C. 4
D. 5
Ans: C
73. 2004 Q2
X, Y and Z are three consecutive elements in the Periodic Table. X forms a stable anion X-, while Z forms a
stable cation Z+. Which of the following statements about X, Y and Z is correct?
A. X, Y and Z are elements in the same period of the Periodic Table.
B. Both X and Z are electrical conductors under room temperature and pressure.
C. Y reacts with Z readily.
D. X-and Z
+have the same electronic arrangement.
Ans: D
74. 2004 Q4
Which of the following substances is the poorest electrical conductor?A. vinegar
B. household bleach
C. soap solution
D. antiseptic alcohol
Ans: D
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75. 2004 Q23
Element X has three isotopes,206
isotopes.
What is the relative atomic mass of
A. 206.8
B. 207.0
C. 207.3
D. 207.5
76. 2004 Q29-30
Directions:Questions 76 and 77 refer
as listed in the table belo
Substance
Argon
Bromine
Chlorine
Sulphur dioxide
Which substance exists as a liquid
A. argon
B. bromine
C. chlorine
D. sulphur dioxide
22
,207
X and208
X. The graph below shows the
X?
to the melting points and boiling points of four s
:
elting pointoC Boiling point
oC
-189 -186
-7 59
-101 -35
-75 -10
t -90oC and 1 atm pressure?
relative abundances of the
Ans: C
ubstances at 1 atm pressure
Ans: C
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77. Which of the following chemical bonds/attractive forces exist(s) in all four substances at 25oC and 1 atm
pressure?
(1) van der Waals forces
(2) ionic bond
(3) covalent bond
A. (1) only
B. (2) only
C. (1) and (3) only
D. (2) and (3) only
Ans: A
78. 2004 Q31
The atomic number of element X is 15. It has only one isotope with a mass number of 31. Which of the
following statements concerning X is correct?
A. X forms an oxide which dissolves in water to give an alkaline solution.
B. In the compound formed from X and sodium, X has an oxidation number of -3
C. X is a gas at room temperature and pressure.
D. There are 15 neutrons in the nucleus of an atom of X.
Ans: B
79. 2005 Q6
Consider the information given in the table below:
Element Atomic number
w 6
x 17
y 18
z 20
Which of the following pairs of element would react with each other most readily?
A. w and y
B. w and z
C. x and y
D. x and z
Ans: D
80. 2005 Q7
Which of the following statements concerning van der Waals forces is correct?
A. They exist in quartz.
B. They exist in limestone.
C. They exist in solid iodine.D. They exist in solid ammonium nitrate.
Ans: C
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81. 2005 Q9
Which of the following chlorides has the highest melting point?
A. HCl
B. LiCl
C. SCl2
D. CCl4
Ans: B
82. 2005 Q13
Consider the information given in the table below:
Particle
X Y Z W
No. of protons 8 8 8 10
No. of electrons 10 10 8 10
No. of neutrons 8 10 10 10
Which of the following statements about the particles is correct?
A. W and Z are isotopes.
B. X and Z have the same mass.
C. Y and Z have the same charge.
D. X and W have the same electronic arrangement.
Ans: D
83. 2005 Q27
Which of the following properties of sodium chloride is/are evidence(s) to support that ionic bonds are strong?
(1) It is soluble in water.
(2) It has a high melting point.
(3) It can conduct electricity in molten state.
A. (1) only
B. (2) only
C. (1) and (3) only
D. (2) and (3) only
Ans: B
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84. 2006 Q1
The electronic diagram of a compound formed between element X and element Y is shown below:
(Only electrons in the outermost shells are shown.)
Which of the following combinations concerning X and Y is correct?
X Y
A. carbon oxygen
B. silicon oxygen
C. oxygen sodium
D. oxygen chlorine
Ans: D
85. 2006 Q2
Which of the following statements about the Periodic Table is correct?
A. The elements are arranged in order of increasing relative atomic mass.
B. The reactivity of the elements in Group II decreases down the group.
C. The boiling point of the elements in Group VII decreases down the group.
D.
All elements in Group 0 exist in gaseous state at room temperature and pressure.
Ans: A
86. 2006 Q5
Fe56
26 is an isotope of iron. Which of the following correctly describes the number of subatomic particles in
an Fe3+
ion formed from this isotope?
No. of electrons No. of neutronsA. 23 26
B. 23 30
C. 24 26
D. 26 30
Ans: B
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87. 2006 Q14
Element X has two isotopes,39
X and41
X. The table below lists the percentage abundance of the two isotopes:
Isotope Percentage abundance
39X 93.2
41
X 6.8
What is the relative atomic mass of X?
A. 39.0
B. 39.1
C. 40.0
D. 40.9
Ans: B
88. 2006 Q24
In which of the following atoms or ions is the outermost shell an octet?
(1) Li+
(2) Ne
(3)2S
A.
(1) only
B. (2) only
C. (1) and (3) only
D. (2) and (3) only
Ans: D
89. 2007 Q3
X is an element in the Periodic Table and X+ion has an electronic arrangement of 2, 8, 8. Which of the
following statements concerning Xis correct?
A. Xis a halogen.
B. Xis a transition element.
C. Xis a group 0 element.
D. Xis a period 4 element.
Ans: D
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90. 2007 Q12
Which of the following pairs of elements would form a covalent compound?
A. mercury and neon
B. neon and nitrogen
C. mercury and fluorine
D. fluorine and nitrogen
Ans: D
91. 2007 Q13
Mis an element in the Periodic Table. M 2
ion possesses 45 neutrons and 36 electrons. What is M?
A. Se
B. Kr
C. Sr
D. Rh
Ans: A
92. 2007 Q18
Consider the information below:
Solid Melting point Electrical conductivity Solubility in water
W high good insoluble
X high non-conducting soluble
Y low non-conducting soluble
Z very high non-conducting insoluble
Which of the following solids is likely to be an ionic compound?
A.
W
B. X
C. Y
D. Z
Ans: B
93. 2007 Q43
Which of the following bonds or attractive forces exist in ammonium nitrate?
(1)
ionic bond
(2) covalent bond
(3) van der Waals forces
A. (1) and (2) only
B. (1) and (3) only
C. (2) and (3) only
D. (1), (2) and (3)
Ans: A
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94. 2008 Q2
Jand Qare two alkaline earth metals in the Periodic Table. If the atomic number of Jis x, then the atomic
number of Qcould be
A. 2x ,
B. 6x + ,
C. 10x ,
D. 18x + .
Ans: D
95. 2008 Q9
The table below shows the colour of the aqueous solutions of three ionic compounds.
Compound Colour of aqueous solution
QT green
XZ yellow
XT colourless
Which of the following combinations about the colour of the ions involved is most likely to be correct?
(aq)2+Q (aq)X2+ (aq)T2 (aq)Z2
A. colourless colourless colourless colourless
B. green yellow green yellow
C. colourless yellow green colourless
D. green colourless colourless yellow
Ans: D
96. 2008 Q18
In which of the following groups of substances there exists a difference in bonding type among the
substances?
A. iodine, oxygen, nitrogen
B. chromium, mercury, aluminium
C. methane, ethyl ethanoate, sulphur dioxide
D. potassium chloride, hydrogen chloride, silver chloride
Ans: D
97. 2008 Q19
Which of the following statements concerning a water molecule is / are correct?
(1) The number of bonding electrons contributed by each hydrogen atom in the molecule is 2.
(2) The number of bonding electrons contributed by the oxygen atom in the molecule is 2.
(3) The total number of electrons in the molecule is 8.
A. (1) only
B. (2) only
C. (1) and (3) onlyD. (2) and (3) only
Ans: B
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98. 2008 Q22
Comparing the elements in the second period of the Periodic Table, from lithium to fluorine, which of the
following statements is / are correct?
(1) They show a gradual change from having metallic property to having non-metallic property.
(2) They show a gradual increase in the number of electron shells in their atoms.
(3) They show a gradual decrease in melting point.
A. (1) only
B. (2) only
C. (1) and (3) only
D. (2) and (3) only
Ans: A
99. 2008 Q46
A certain form of solid carbon is composed of 60C molecules. Each 60C molecule is formed by 60 carbon
atoms bonded together like a football as shown in the diagram below :
Which of the following statements is / are correct?
(1) The molar mass of 60C is 12.0 g.
(2) The solid gives carbon dioxide upon complete combustion.
(3) The melting point of the solid is higher than that of diamond.
A. (1) only
B. (2) only
C. (1) and (3) only
D. (2) and (3) only
Ans: B
100. 2009 Q1The electronic arrangements of three chemical species are shown below.
W : 2, 1
X2+
: 2, 8
Y
: 2, 8, 7
Which of the elements W, Xand Yare in the same period of the Periodic Table?
A. Wand Xonly
B. Wand Yonly
C. Xand Yonly
D. W, Xand Y
Ans: C
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101. 2009 Q3
Which of the following properties is NOT possessed by both carbon and nitrogen?
A. They can form multiple bonds.
B. They can exist in giant covalent structures.
C. They are chemically stable at room temperature and pressure.
D. They react with oxygen under suitable conditions to form acidic oxides.
Ans: B
102. 2009 Q18
Which of the following statements concerning the Periodic Table is / are correct?
(1) Ni is an example of transition elements.
(2) The elements are arranged in increasing order of neutron number.
(3) The lower the element located in each group, the more reactive the element is.
A. (1) only
B. (2) only
C. (1) and (3) only
D. (2) and (3) only
Ans: A
103. 2009 Q19
Which of the following substances can exist in the form of simple molecules?
(1) iodine
(2) nylon
(3) dry ice
A. (1) only
B. (2) only
C. (1) and (3) only
D. (2) and (3) only
Ans: C
104. 2009 Q22
A substance has a high melting point and does not conduct electricity when in solid state.
It may be(1) a compound with giant molecules.
(2) an element with giant covalent structure.
(3) a compound with giant ionic structure.
A. (1) and (2) only
B. (1) and (3) only
C. (2) and (3) only
D. (1), (2) and (3)
Ans: D
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105. 2010 Q1
How many electrons and neutrons are there in a doubly charged cation formed from Mn5525 ?
Number of electrons Number of neutrons
A. 23 30
B. 23 32
C. 25 28
D. 25 30
Ans: A
106. 2010 Q3
X2+
ion has an electronic arrangement of 2, 8, 8. Which of the following statements concerning the carbonate of
Xis INCORRECT ?
A. It is a white solid.
B. It is soluble in water.
C. It decomposes on heating.
D. It produces a brick red flame in flame test.
Ans: B
107. 2010 Q4
Assuming that the total volume of 20 drops of water is 1.0 cm3, what is the number of molecules in 1 drop of
water ?
(Avogadros constant : 6.02
1023
mol-1
; density of water: 1.0 g cm-3
;
relative atomic masses :H = 1.0, O = 16.0)
A. 1.7 1021
B. 3.3 1021
C. 3.0 1022
D. 3.3
1022
Ans: A
108. 2010 Q8
Naturally occurring magnesium has three isotopes ,24
Mg,25
Mg and26
Mg. The relative abundance of the25
Mg
isotope is 10%. What is the relative abundance of the26
Mg isotope ?(Relative atomic mass : Mg = 24.3)
A. 10%
B. 15%
C. 23%
D. 85%
Ans: A
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109. 2010 Q13
Which of the following combinations shows a correct matching of a molecule and its structural formula ?
molecule structural formula
A. nitrogen N=N
B. helium He
He
C. carbon dioxide O C O
D. hydrogen peroxide H
O
O
H
Ans: D
110. 2010 Q17
Which of the substances listed in the following table has a giant ionic structure ?
Substance Electrical conductivity in solid state Electrical conductivity in molten state
W not conducting not conducting
X not conducting conducting
Y conducting not conducting
Z conducting conducting
A. W
B. X
C. Y
D. Z
Ans: B
111. 2010 Q31
The structure of a sulphur molecule in sulphur powder is shown below :
Which of the following statements is correct ?
(Relative atomic mass : S = 32.1)
A. The relative molecular mass of sulphur is 32.1.
B. The oxidation number of sulphur in the molecule is 0.
C. The attraction between sulphur molecules is covalent bond.
D. Double bonds are present between adjacent atoms in sulphur molecule.
Ans: B