NSS Chemistry Part 2 Microscopic World I _MC

7/23/2019 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.

1

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)


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


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


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


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


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


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


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


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


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)


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)


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

NSS Chemistry Part 2 Microscopic World I _MC

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