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WAEC questions for "Chemistry :: Periodic Chemistry"
Q1

The following properties are characteristics of transition elements except

A

formation of complex ions

B

fixed oxidation states

C

formation of coloured compounds

D

catalytic abilities

E
Q2

Which of the following electronic configuration correctly represents an element in period 3 of the periodic table?

A

1s22s22p3

B

1s22s22p6

C

1s22s22p6

D

1s22s22p63s23p4

E

1s22s22p63s23p64s1

Q3

An element Q forms a compound QCl5. In which group of the Periodic table is Q?

A

I

B

III

C

V

D

VII

E
Q4

Which of the following arrangement is in order of increasing ionization energy?

A

Al, Si, P, S

B

Si, Al, S, P

C

S, P, Si, Al

D

D, P, Si, S, Al

E
Q5

Which of the following statements is not true of halogens?

A

They exist in different physical states

B

 They exist as diatomic molecules

C

Their ionic radii decrease down the group

D

Their melting and boiling points increase down the group

E
Q6

Elements in the same group of the periodic table have

A

the same number of valence electrons

B

the same  number of electrons shells

C

different chemical behaviour

D

the same atomic size

E
Q7

Arrange the following elements in order of increasing electron afinity: Br2, Cl2, I2, F2,

A

I2, Cl2, Br2, F2

B

I2, Br2, Cl2, F2

C

Cl2, I2, Br2, F2

D

Br2, Cl2, I2, F2

E
Q8

Which of the following properties is charactersitic of halogens?

A

Ability to accept electrons readily

B

Ability to donate electrons readily

C

Ability to form basic oxides

D

Formation of coloured compounds

E
Q9

A transition metal would be expected to

A

form oxides with different formulae

B

having strong oxidizing ability

C

have low density

D

having an atomic structure with an incomplete outermost shell

E
Q10

Which of the following properties of atoms generally increases down a group in the Periodic table?

A

Electron affinity

B

Electronegativity

C

Ionic radius

D

Ionic energy

E
Q11

Which of the following statements about sodium is not true?

A

Na+ is smaller in size than Na

B

Na is smaller in size than Na+

C

Na+ has fewer electrons than Na

D

The effective nuclear charge in Na+ is greater than in Na

E
Q12
Which of the following electronic configurations represents that of a noble gas?
A
2,8,8,2
B
2,8,2
C
2,8
D
2,6
E
Q13
Diamond is a hard substance because its carbon atoms are held by
A
delocalised electrons
B
strong electrostatic forces
C
Van der Waals forces
D
strong directional covalent bons
E
Q14
Elements which belong to the same group in the periodic table are characterised by
A
difference of +1 in the oxidation number of sucessive members
B
presence of the same number of outermost electrons in the respective atoms
C
difference of 14 atomic mass units between successive members
D
presence of the same number of electrons in the respective atoms
E
Q15

Which of the letters represents an alkaline earth metal?

A

F

B

E

C

D

D

C

E
Q16

Which of the following pairs of letters denotes elements containing the same number of electrons in the outermost shell?

A

C and D

B

E and F

C

B and G

D

A and B

E
Q17

Which of the following sets of elements are arranged in order of decreasing atomic size in the periodic table?

A

6C, 4Be, 7N, 8O

B

4Be, 6C, 7N, 8O

C

8O, 7N, 6C, 4Be

D

7N, 8O, 6C, 4Be

E
Q18

Which of the following properties of elements decreases generally across a period in the periodic table?

A

Electro-negativity

B

Electron affinity

C

Atomic radius

D

Ionization energy

E
Q19

Which of the electrons in the following orbital will experience the greatest nuclear attraction?

A

1s electron of helium

B

1s electron of potassium

C

2s electron of boron

D

2s electron of carbon

E
Q20
A nuclide emits a beta particle as shown below. In the process, the atomic number 0 e -1
A
increases by 1 while the mass number remains constant
B
decreases by 2 while the mas number remains constant
C
remains constant while the mass number decreases by 2
D
remains constant while the mass number increases by 1
E
Q21
One of the characteristics of transition metals is
A
reducing ability
B
ductility
C
ability to conduct electricity
D
formation of coloured ions
E
Q22

How many electrons are in the L shell of
31  
  P
15  

A

2

B

5

C

8

D

16

E
Q23

Where is X in the Periodic Table?

A

Group II

B

Group III

C

d-block

D

s-block

E
Q24

Which of the following compounds is not suitable for the preparation of oxygen by heating?

A

KClO3

B

H2O2

C

NaNO3

D

AgNO3

E
Q25

Group O elements are unreactive because

A

their outermost shell contain equal number of electrons

B

their highest occupied energy level is full

C

they are monoatomic gases

D

they are non-metals

E
Q26

Which of the particles indicated below represents an ion with a charge of 2+

  Protons Electrical conductivity of the element
A 6 6
B 6 8
C 12 10
D 16 18

A

6, 6

B

6, 8

C

12, 10

D

16, 18

E
Q27

Sodium(Atomic number 11) and caesium(atomic number 55) are in Group I in the periodic table. Which of the following statements is correct?

A

Sodium has the higher electronegativity

B

Caesium contains the higher number of valence electrons

C

sodium has the lower ionization energy

D

Caesium has the lower reducing ability

E
Q28

An element X with electronic configuration 1s22s22p63s23p2. Combines with another element Y with electronic configuration 1s22s22p63s23p2. What is the formular of the compound formed?

A

X2Y5

B

X2Y3

C

XY3

D

XY2

E
Q29

Study the table below and use it to answer Question 9

Element Melting Point (°C) Physical state of its oxide Electrical conductivity of the element
I -39 Solid Very good
II 112.8 Gas Nil
III 97.5 Solid Good
Which of the elements in the table above can be classified as metal?

A

II only

B

II and III only

C

I and III only

D

III only

E
Q30

Which of the letters represent alkaline earth metal?

A

M

B

Q

C

J

D

X

E
Q31

An element Y has the electronic configuration 1s22s22p63s23p4. To what peiod does it belong in the periodic table?

A

3

B

4

C

5

D

6

E
Q32

If a metal R forms a compound  with the formula R(NO3)2, the formular of its tetraoxosulphate (VI) is

A

R(SO4)2

B

RSO4

C

R2SO4

D

R2(SO4)3

E
Q33

P, Q, R and S are metals in the same group in the Periodic Table but in 3, 4, 5 and 6 respectively. Which of them loses electrons least readily?

A

P

B

Q

C

R

D

S

E
Q34

Elements which belong to the same group in the periodic table are characterized by

A

difference of +1 in the oxidation number of successive members

B

presence of the same number of outemost electrons in the respective atoms

C

difference of 14 atomic mass unit between successive members

D

presence of the same number of electron shell in the respective atoms

E
Q35

The atom of an element X has 2 electrons in the outermost shell. What is the formular of the compound formed when X combines with aluminum(13Al) ?

A

AlX2

B

Al2X

C

Al2X2

D

Al2X3

E
Q36

The presence of unpaired electrons in an atom of transition metal give rise to

A

paramagnetism

B

malleability

C

ductility

D

shiny appearance

E
Q37

Which of the following non metals react readily with metals?

A

Nitrogen

B

Chlorine

C

Sulphur

D

Carbon

E
Q38
Which of the following properties increases down a group in the Periodic Table?
A
Atomic radius
B
Electronegativity
C
Electron affinity
D
Ionization energy
E
Q39
In the Periodic Table, the elements that lose electrons must readily belong to
A
Group IA
B
Group IIA
C
Group IIIA
D
Gorup VIIA
E
Q40

Which of the following halogens is the most reactive?

A

F2

B

Br2

C

I2

D

Cl2

E
Q41

Which of the following group 1 elements has the highest ionization energy?

A

55cs

B

37RD

C

19k

D

11Na

E

3LI

Q42

What is the most probable group of an element which is a soft, silvery, white solid and reacts violently with water?

A

Group 0

B

Group 1

C

Group 4

D

Group 6

E

Group 7

Q43

What is the value of X in the following equation?

MnO4- + 4H+ + xe- → MnO2 + 2H2O

A

2

B

3

C

4

D

7

E

8

Q44

The ash used for making black soap locally provides

A

glycerol

B

sodium chloride

C

potassium ions

D

stearic acid

E

glyceride

Q45

What is the likely formula of a compound formed between elements M in group two and elements X in group seven?

A

M7X2

B

M2X

C

M2X7

D

MX2

E

MX6

Q46

Nitrogen is prepared on a large scale by the

A

fractional distillation of liquefied air

B

decomposition of ammonium dioxonitrate (III)

C

electrolysis of brine

D

Haber process

E

contact process

Q47

The following are properties of transition metals except

A

variable oxidation state

B

tendency to form complex ions

C

formation of coloured ions

D

ability to act as catalyst

E

low melting point

Q48

Which of the following metals can results from smoky vehicles include

I   acid fumes

II  hydrogen sulphide

III carbon (II) oxide

IV  carbon particles

A

IV

B

I and II

C

III and IV

D

I, II and III

E

I, II, III and IV

Q49

Which of the following methods is/are used for the extraction of the alkali metals?

I   Reduction by the use of carbon

II  Roasting of the ore in air

III Thermal reduction

IV  Reduction by electrolysis

A

IV

B

I and II

C

III and IV

D

I, II and III

E

I, II, III are IV

Q50

Which of the following CAN NOT be deduced from the electronic configuration of transition elements

A

Possession of magnetic property

B

Ability to form complex ions

C

Position in the periodic table

D

Variable oxidation state

E

Physical properties of metals

Q51

A positive brown ring test indicates the presence of

A

NO3

B

Fe3+

C

SO32-

D

Cu+

E

NO2

Q52

Which of the following is an alloy of mercury?

A

Stainless steel

B

Soft solder

C

Coinage bronze

D

Amalgam

E

Duralumin

Q53

Chlorine is prepared on a large scale by the

A

electrolysis of concentrated sodium chloride solution

B

action of manganese (IV) oxide on hot hydrochloric acid

C

action of concentrated tetraoxosulphate (VI) acid on sodium chloride

D

oxidation of concentrated hydrochloric acid with potassium tetraoxomanganate (VII)

E

action of dilute mineral acid on bleaching powder

Q54

Which of the following is the configuration of Sodium ion (Na+) if the atoms is represented as

23  
  Na
11  

A

1s22s22p6

B

1s22s22p63s2

C

1s22s22p63s2

D

1s22s22p63p23p63d24s2

E

1s22s22p63s23p63d342

Q55

Which of the following can displace copper from aqueous soluiton of copper (II) salt?

I   Mg

II  Al

III Zn

IV  Fe

A

IV

B

I and II

C

III and IV

D

I, II and III

E

I, II, III and IV

Q56
The properties of aluminium which make the metal useful in the manufacture of cooking utensil include its. I. resistance to corrosion II. lightness and durable III ability to conduct heat and electricity IV ability to react with both acid and bases
A
IV
B
I and II
C
III and IV
D
I, II and III
E
I, II, III and IV
Q57
Calcium is usually extracted by electrolysis of its
A
trioxonitrate (V)
B
tetraoxosulphate (VI)
C
oxide
D
hydride
E
chloride
Q58

The position of an element in the Periodic Table is determined by

A

its density

B

its atomic radius

C

its relative atomic mass

D

the number of protons in its atom

E

the number of neutrons in its atom

Q59
Which of the following is not a halogen?
A
Silicon
B
Flourine
C
Astantine
D
Bromine
E
Iodine
Q60
When magnesium ribbon burns in air, the products are
A
magnesium nitride and magnesium oxide
B
magnesium nitride and soot
C
magnesium oxide and steam
D
magnesium oxide and carbon (II) oxide
E
magnesium nitride and carbon (II) oxide