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WAEC questions for "Chemistry :: States of Matter"
Q1

How many molecules are there in 14g of nitrogen at s.t.p? [N = 14, Avogadro's constant = 6.02 x 1023 mol-1]

A

6.02 x 1023

B

3.01 x 1023

C

8.43 x 1024

D

1.20 x 1024

E
Q2

Which of the following gases is lighter than air?

A

CO2

B

SO2

C

NH3

D
E
Q3

What is the value  of -14°C on the Kelvin temperature scale?

A

259K

B

259°K

C

287K

D

287°K

E
Q4

Which of the following expressions correctly represents Charles law?

A

PV = K

B

 R ∞ 1 √P

C

PV = RT

D

V = KT

E
Q5

In a mixture of gases which do no react chemically together, the pressure exerted by the individual gases is called

A

Atmospheric pressure

B

Partial pressure

C

total pressure

D

vapour pressure

E
Q6

Consider the reaction represented by the following equation: Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g). What volume of hydrogen gas is produced at s.t.p when 3.25g of zinc reacts with excess dilute HCl?[Zn = 65, Molar gas volume at s.t.p = 22.4dm-3]

A

1.12dm3

B

2.24dm3

C

4.48dm3

D

8.96dm3

E
Q7

In a fixed volume of a gas, an increase in temperature results in an increase in pressure due to an increase in the

A

number of collisions between the gas molecules

B

number of repulsion between the gas molecules and the walls of the contaner

C

number of collisions between the gas molecules

D

kinetic energy of the gas

E
Q8

Diamonds does not conduct electricity because it

A

has no free valence electron

B

is a giant molecules

C

contains no bonded electron

D

is a solid at room temperature

E
Q9

Which of the following gases has the lowest rate of diffusion under the same conditions of temperature and pressure? [H = 1, O = 16, Ne = 20, Cl = 35.5]

A

Chlorine

B

Hydrogen

C

Neon

D

Oxygen

E
Q10

How many atoms are there in one mole of hydrogen gas? [Avogadro's constant = 6.02 x 1023mol-1]

A

1.2 x 1023

B

6.0 x 1023

C

12 x 1024

D

60 x 1024

E
Q11

What is the percentage composition of oxygen in K2Cr2O7? [K2Cr2O7 = 294; O = 16; K = 39; Cr =52]

A

14.20%

B

26.53%

C

35.37%

D

38.09%

E
Q12

What is the IUPAC name of the compound represented by the molecular formular NaClO4

A

Sodium tetraoxochlorate (I)

B

Sodium tetraoxochlorate (IV)

C

Sodium tetraoxochlorate (VI)

D

Sodium tetraoxochlorate (VII)

E
Q13

Which of the following gases is lighter than air?

A

CO2

B

SO2

C

HCl

D

NH3

E
Q14

Which of the following statements is true of the molecules of a gas under ideal conditions? The molecules

A

move at random

B

undergo ineleastic collision

C

attract each other

D

occupy a large volume

E
Q15

What volume will 0.5g of H2 occupy at s.t.p? [H = 1; 1 mole of a gas occupy 22.4dm3 at s.t.p]

A

22.4dm3

B

5.60dm3

C

11.20dm3

D

44.80dm3

E
Q16

Which of the letters indicate elements which exist as diatomic gases?

A

B and G

B

C and F

C

C and A

D

A and E

E
Q17

The volume occupied by a given mass of gas depends on its

A

diffusion rate

B

temperature and pressure

C

degree of solubility

D

relative density

E
Q18

Which of the following statements is not a postulate of the kinetic theory of gases?

A

Molecules move with the same speed

B

Intermolecular forces are negligible

C

molecules are in astate of constant random motion

D

collision between molecules are elastic

E
Q19

A solid can be obtained from its saturated solution by

A

filteration

B

crystallization

C

condensation

D

decomposition

E
Q20

The method of collection of gases prepared in the laboratory depend on their

A

odour and atomicity

B

colour and odour

C

atomicity and density

D

solubility density

E
Q21

Which of the following decrease when a given mass of a gas is compressed to half its initial volume?

A

Average intermolecular distance

B

Frequency of collisions

C

Number of molecules present

D

E
Q22

The gas given off when NH4Cl is heated with an alkali is

A

H2

B

Cl2

C

N2

D

NH3

E
Q23

Which of the following statements about ideal gases is/are correct?

I. The cohesive forces between their particles are negligible.

II. They have no definite volume, but occupy the volume of their containers

III. They are not compressible

IV Their particles collide with loss of energy

A

I only

B

I and II only

C

I, II and III only

D

I, II, III and IV

E
Q24

Ptotal = P1 + P2 + P3 +.......Pn where Ptotal is the pressure of a mixture of gases. The equation above is an expression of

A

Graham's law

B

Gay-Lussac's law

C

Boyle's law

D

Dalton's law

E
Q25

If 1.0dm3 of gas X diffuses through a porous plug in 60 seconds while the same volume of hydrogen diffuses in 15second under the same condition, calculate the relative molecular mass of X.[H = 1.0]

A

4.0

B

8.0

C

16

D

32

E
Q26

A mixture of calcium chloride and calcium trioxocarbonate (IV) in water can be seperated by

A

evaporation

B

sublimation

C

distillation

D

filtration

E
Q27

Which of the following increases as boiling water changes to steam?

A

Temperature of the system

B

Degree of disorder in the system

C

Number of molecules

D

Activation energy

E
Q28

Which of the following gases is colourless, odourless and soluble in potassium hydroxide solution?

A

NO2

B

SO2

C

NH2

D

CO2

E
Q29

The gas evolved when dilute tetraoxosulphate (VI) acid reacts with sodium hydrogentrioxocarbonate (IV) is

A

hydrogen

B

oxygen

C

Carbon (IV) oxide

D

Sulphur (IV) oxide

E
Q30

Which of the following procedures is suitable for identifying the food colouring added to a pastry sample?

A

Carry out some food test

B

Examine the pastry sample under a microscope

C

Do a chromatography of the colouring extract

D

Determine the molar mass of the colouring

E
Q31

Exhaust fumes discharged from a smoky vehicle gradually becomes invisible as a result of

A

diffusion

B

combustion

C

absorption

D

emission

E
Q32

Which of the following movement can be described as random motion?

A

A wheel barrow being pushed

B

A car travelling on a straight line

C

Gas molecules colliding in a flask

D

Planets going round the sun

E
Q33

Equal volumes of CO2 and CO at s.t.p have the same

A

mass

B

density

C

rate of diffusion

D

number of molecules

E
Q34

Gas molecules are said to be perfectly elastic because

A

they collide without loss of energy

B

they move about in straight lines

C

the distances between them are negligible

D

the volume occupied by them is negligible

E
Q35

Separating funnel is used for separating a mixture of

A

liquids with different boiling points

B

sediments in liquid

C

Liquids with different colours

D

liquids that are immiscible

E
Q36

What volume of hydrogen is produced at s.t.p when 2.60g of zinc reacts with excess HCl according to the following equation? Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g) [Zn = 65; 1 mole of a gas occupies 22.4dm3 at s.t.p]

A

0.40dm3

B

0.89dm3

C

5.82dm3

D

8.62dm3

E
Q37

Helium is preferred to hydrogen in filling balloons because hydrogen

A

is inflammable

B

is diatomic

C

exhibits isotopy

D

is a component of water

E
Q38

30cm3 of hydrogen at s.t.p combine with 20cm3 of oxygen to form steam according to the following equation: 2H2(g) + O2(g) → 2H2O(g) . Calculate the total volume of the gaseous mixture at the end of the reaction

A

50cm3

B

35cm3

C

30cm3

D

25cm3

E
Q39

What volume of oxygen at s.t.p would react with carbon to form 4.40g of CO2 according to the following equation? C(s) + O2(g) → CO2(g) [O = 16; C = 12; 1 mole of gas occupies 22.4dm3 at s.t.p]

A

0.224dm3

B

2.24dm3

C

4.40dm3

D

4.48dm3

E

22.4dm3

Q40
Metals are said to be malleable because they
A
are good conductors of heat
B
are good conductors of electricity
C
can be beaten into sheets
D
can be alloyed
E
can be polished
Q41
A device used in the laboratory for intermittent production of gases without heating is
A
Leibig condenser
B
aspirator
C
delivery tube
D
inverted funnel
E
Kipp's apparatus
Q42
The liquid product of the destructive distillation of coal is
A
kerosene
B
ethanol
C
ammoniacal liquor
D
paraffin oil
E
aqueous ammonia
Q43

Which of the following pairs are allotropes?

I   Water and hydrogen peroxide

II  Coal tar and coal gas

III Diamond and graphite

IV  Rhombic sulphur and monoclinic sulphur

A

IV

B

I and II

C

III and IV

D

I, II and III

E

I, II, III and IV

Q44

Moecules which are non-linear include

I methane

II ammonia

III hydrogen

IV oxygen

A

IV

B

I and II

C

III and IV

D

I, II and III

E

I, II, III and IV

Q45

Boyles law can be expressed mathematically as

A

V α 1/p (T constant)

B

V1/T1 = V2/T2

C

V α T(P constant)

D

P α V(T constant)

E

P α T

Q46

The phenomenon observed when dust particles collide randomly in a beam of sunlightly is known as

A

Tyndal effect

B

diffusion

C

osmosis

D

Brownian movement

E

dialysis

Q47

An increase in the pressure of a gas results in a decrease in its

A

mass

B

vapour density

C

volume

D

temperature

E

concentration

Q48

A given volume of methane diffuses in 20 seconds. How long will it take the same volume of sulphur (IV) oxide to diffuse under the same conditions? [CH4 = 16;SO2 = 64]

A

5 seconds

B

20 seconds

C

40 seconds

D

60 seconds

E

80 seconds

Q49
Separation of mixtures of solid by physical methods can be based on differences in the following except
A
melting point
B
solubility
C
particle size
D
molar mass
E
magnetic properties
Q50
The use of diamonds in abrasive is due to its
A
high melting point
B
durability
C
lustre
D
hardness
E
octahedral shape
Q51
Which of the following solids is/are expected to have a relatively high melting point on the bases of structure? I Calcium oxide II Sodium chloride III Sulphur IV Iodine
A
IV
B
I and II
C
III and IV
D
I, II and III
E
I, II, III and IV
Q52
Which of the following statement is/are correct about the average kinetic energy of the molecules of a gas? I Remains constant at constant temperature II Decreases with a fall in temperature III Increases with a decrease in volume IV Increases with an increase in pressure
A
IV
B
I and II
C
III and IV
D
I, II and III
E
I, II, III and IV
Q53
The existence of two or more forms of the same element in the same physical state is known as
A
allotropy
B
resonance
C
hybridization
D
isotopy
E
isometrism
Q54

"Equal volumes of all gases at the same temperature and pressure contain the number of molecules" is an expression of

A

Charles Law

B

Boyles's Law

C

Graham's Law

D

E

GayLussac's Law

Q55

The method of collection of gas depends on its

I.  boiling point

II  Odour

III Density

IV  Solubility

A

IV

B

I and II

C

III and IV

D

I, II and III

E

I, II, III and IV

Q56

Avogadro number can be defined as the number of

I   molecules in 22.4dm3 of gas at s.t.p

II  molecules in one mole of compound

III electrons in 96,500 coulombs of electricity

IV electrons in the outermostshell

A

IV

B

I and II

C

III and IV

D

I, II and III

E

I, II, III and IV

Q57
At a given temperature and pressure, gas A diffuses twice as fast as gas B. It follows that I gas B is heavier than gas A II gas B is four times as heavy as gas A III gas B is monoatmic IV gas A is diatomic
A
IV
B
I and II
C
III and IV
D
I, II and III
E
I, II, III and IV
Q58
All pure samples of the same chemical compound contain the same elements in the same proportion of by mass is a statement of
A
the law of conservation of matter
B
the law of constant composition
C
the law of multiple proportion
D
Gay Lussac's law
E
Q59

If a solid has a low melting point and dissolves readily in benzene, it would probably

A

contain strong electrostatic forces of attraction

B

conduct electricity in molten state

C

dissolve in water

D

have covalent bonding

E

absorb moisture on exposure to air

Q60
The following can be obtained directly from the destructive distillation of coal except
A
ammoniacal liquor
B
coke
C
producer gas
D
coal gas
E
coal tar