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WAEC questions for "Chemistry :: Chemistry, Industry and The Environment"
Q1

A consequence of global warming is

A

air pollution

B

flooding

C

increased humidity

D

low rainfall

E
Q2

The major prouduct in the solvay process is

A

NaOH

B

Na2CO3

C

NH3

D

H2SO4

E
Q3

Which of the following alloys does not  copper?

I   Brass

II  Bronze

III Steel

 

A

I only

B

II only

C

III only

D

II and III only

E
Q4

Which of the following substances causes depletion of the ozone layer in the atmosphere?

A

Carbon (IV) oxide

B

Chlorofluorocarbon

C

Sulphur (IV) oxide

D

Hydrocarbons

E
Q5

Chemicals that are produced in small quantities and with very high degree of purity are

A

bulk chemicals

B

fine chemicals

C

heavy chemicals

D

light chemicals

E
Q6
Aluminium is a good roofing material because
A
is strong and does not conduct heat and electricity
B
readily absorbs light
C
forms an oxide film over its surface which prevents corrosion
D
is flexible and can conduct heat
E
Q7

Which of the following alloys is mainly used in making statutes?

A

Brass

B

Bronze

C

Duralumin

D

Steel

E
Q8

Which of the following activities is not a source of air pollution?

A

Cigeratte smoking

B

Carbon dating

C

Domestic fires

D

Coal powered stations

E
Q9

From which of the following ores is iron extracted?

I   Haematite

II  Bauxite

III Magnetite

IV Cassiterite

A

I and II only

B

I and III only

C

I, II and III only

D

I, II, III and IV

E
Q10

Which of the following methods can be used to separate a mixture of two miscible liquids with different boiling points?

A

Decantation

B

Distillation

C

Evaporation

D

Filtration

E
Q11

The following substances are heavy chemicals except

A

sodium trioxocarbonate (IV)

B

tetraoxosulphate (VI) acid

 

 

 

 

C

lead (IV) tetraethyl

D

sodium hydroxide

E
Q12

Pig-Iron is brittle because it contains

A

a high percentage of carbon as impurity

B

calcium trioxosilicate (IV)

C

unreacted haematite

D

undecomposed limestone

E
Q13

Which of these metals will not liberate hydrogen from dilute HCl?

A

Copper

B

Iron

C

Magnesium

D

Zinc

E
Q14

Metal can be extracted from their ores by a process involving

A

reduction

B

oxidation

C

hydrolysis

D

decomposition

E
Q15

Greenhouse effect can be reduced by controlling

A

water evaporation

B

burning of wood and fossil fuel

C

the use of aerosols

D

the use of artificial fertilizer

E
Q16

Waste plastics accumulate in the soil and pollute the environment because plastic materials are

A

insoluble in water

B

non-biodegradable

C

easily affected by heat

D

inflammable

E
Q17

Which of the following substsances is an ore of iron?

A

Bauxite

B

Cassiterite

C

Haematite

D

Steel

E
Q18

The ammonium compound used in the manufacture of dry cell is

A

NH4NO3

B

(NH4)2SO4

C

NH4Cl

D

(NH4)2CO3

E
Q19

Hardness in water can be removed by adding

A

copper (II) tetraoxosulphate (VI)

B

sodiumtrioxocarbonate (IV)

C

sodium chloride

D

alum

E
Q20

Which of the following compounds is an alloy of lead?

A

Brass

B

Duralumin

C

Stainless steel

D

Soft solder

E
Q21

In which of the following process is biotechnology not applied?

A

Manufacture of drugs

B

Treatment of domestic sewage

C

Production of alcoholic beverages

D

electroplating of metals

E
Q22

The alloy used extensively in the building industry is

A

steel

B

bronze

C

duralumin

D

type metal

E
Q23

An orange drink concentrate is suspected to contain traces of poisonous green dye and a harmless dye having the same boiling point. Which of the following techniques is the most suitable for isolating the dyes?

A

Fractional distillation

B

Paper chromatography

C

Coagulation

D

Rcrystallization

E
Q24

They key factor to be considered in siting a chemical industry is

A

favourable climatic conditions

B

the availability of space to store raw materials

C

Its nearness to other industrial establishments

D

Its nearness to the source of raw material

E
Q25

During the extraction of iron, the limestone fed into the blast furnace produces CaO which removes

A

excess air

B

unburnt coke

C

earthly impurity

D

molten iron

E
Q26

Which of the following pollutants is biodegradable?

A

Domestic sewage

B

Metal scaps

C

Radioactive waste

D

plastic foil

E
Q27

The process of "seeding" during the extraction of aluminium involves the addition of pure Al(OH)3 crystals in order to

A

lower the temperature

B

Increase the concentration

C

facilitate the precipitation of solid

D

reduce the viscosity of the solution

E
Q28

Which of the following measures is not suitable for controlling water pollution?

A

Treating industrial effluent and domestic sewage before discharge into water

B

Controlling the use of agrochemicals

C

Recycling industrial and agricultural waste

D

Burning industrial and argicultural waste before discharge into water ways

E
Q29

What is the main impurity haematite ?

A

CaSiO3

B

CaCO3

C

SiO2

D

Fe2O3

E
Q30

Which of the following compounds is used for removing impurities in bauxite?

A

NaOH

B

CaCO3

C

Na3AlF6

D

H2SO4

E
Q31

When a sample of water was boiled, it lathered more readily with soap, it can be concluded that the sample most likely contained

A

magnesium tetraoxosulphate (VI)

B

suspended solids

C

organic impurities

D

calcium hydrogentrioxcarbonate (IV)

E
Q32

What are the two gases associated with the formation of acid rain?

A

CO2 and HCl

B

CO2 and N2

C

SO2 and NO2

D

HCl and SO2

E
Q33

Which of the following processes will pollute water?

A

Exposure of a body of water to ultraviolet rays

B

Discharge of industrial effluents into water ways

C

Passage of a river through sand bed

D

Addition of a measured quantity of chlorine water

E
Q34

Iron is often galvanised in order to

A

make it more malleable

B

remove the impurities in it

C

protect it against corrosion

D

render it passive

E
Q35

One of the methods used for combatting air pollution is

A

burning of solid waste

B

provision of sanitary land fills

C

legislation against some industrial pratices

D

scavenging of refuse dumps

E
Q36

Which of the following constitutes an advantage in the use of hard water?

A

Formation of scum with soap

B

Furring of kettles

C

Blockage of water pipes

D

Formation of strong bones

E
Q37

The main type of reaction that occurs in the blast furnace during the extraction of iron is

A

reduction reaction

B

decomposition

C

exothermic reaction

D

combustion

E
Q38

Acidic industrial waste can be treated with

A

lime

B

brine

C

water

D

ethanol

E
Q39

Waste plastic accumulate in the soil and pollute the environment because plastic matrials are

A

insoluble in water

B

non-biodegradable

C

easily affected by heat

D

inflammable

E
Q40
In the electrolytic extraction of aluminum from purified alumina, molten cryolite is added in order to
A
lower the melting point of alumina
B
prevent the aerial oxidation of molten aluminium
C
lower the activation energy of the reaction
D
form a protective crust on top of the electrolyte
E
Q41
which of the following on burning in air, contributes to acid rain?
A
Sulphur
B
Magnesium
C
Aluminium
D
Zinc
E
Q42
Which of the following pollutants encourage the growth of algae in rivers?
A
Oil spills
B
Phosphates from detergent
C
Suspended solids
D
Pesticides residues
E
Q43

Biotechnology is applied in the following except

A

banking industry

B

wine production

C

production of antibiotics

D

manufacture of soap

E
Q44

A plastic which cannot be softened by heat is describe as

A

thermosetting

B

non - biodegradable

C

thermoplastic

D

malleable

E
Q45

Which of the following is needed to produce slag during the extraction of iron in the blast furnace?

A

Cryolite

B

Limstone

C

Carbon

D

Sulphur

E
Q46

Environmental pollution problems are generally more severe in countries which have

A

dense population

B

low birthrate

C

great land mass

D

limited industries

E
Q47

The green house effect  is a climatic condition associated with the presence of excess

A

Carbon (IV) oxide

B

Hydrogen sulphide

C

nitrogen (II) oxide

D

ammonia gas

E
Q48

Pipe-borne water is usually chlorinated in order to

A

improve the taste of the water

B

remove the hardness in the water

C

coagulate sediments in the water

D

kill harmful bacteria in the water

E

make the water

Q49

Two metallic ions comonly present in hard water are

A

Ca2+ and Zn2+

B

Cu2+ and Na

C

Mg2+ and Ca2+

D

Fe2+ and Na+

E

Zn2+ and Cu2+

Q50
Aluminium is extracted from
A
magnetite
B
cryolite
C
duralumin
D
bauxite
E
casserite
Q51
Which of the following is an ore of aluminium?
A
Haematite
B
Magnetite
C
Siderite
D
Bauxite
E
Cassiterite
Q52
Lead and tin are the components of
A
steel
B
bronze
C
brass
D
dentist amalgam
E
soft solder
Q53
Factors which can contribute to environmental pollution include I overpopulation II chemical warfare III agricultural activities IV industrialization
A
IV
B
I and II
C
III and IV
D
I, II and III
E
I, II, III and IV
Q54
Stages in the extraction of tin from tinstone include I. washing with water II crushing the ore III smelting the ore IV form acidic oxides
A
IV
B
I and II
C
I, II and III
D
I, II, III and IV
E
Q55
During water treatment for town supply, water is passed through layers of sand beds in order to
A
soften the water
B
filter the water
C
decolorize the water
D
destroy the germs in the water
E
coagulate colloidal particles in the water
Q56

The function of limestone in the extraction of iron in the blast furnace is

A

The removal of earthly impurities

B

decomposition of the ore

C

conversion of Iron (III) to Iron (II) compounds

D

generation of heat for the process

E

conversion of coke to carbon (II) oxide

Q57

Metals which react with steam only when they are red-hot include

A

copper

B

sodium

C

calcium

D

gold

E

iron

Q58

The processes involved in the treatment of water for town supply include.

I. filtration
II. coagulation
III chlorine
IV distillation

A

IV

B

I and II

C

III and IV

D

I, II and III

E

I, II, III and IV

Q59
Tin is one of the consituents of I. bronze II. soft solder III. duralumin IV. brass
A
IV
B
I and II
C
III and IV
D
I, II and III
E
I, II, III and IV
Q60
Sodium chloride is used in the following processes except
A
treatment of polluted water
B
preservation of food
C
separation of soap glycerol
D
manufacture of chlorine
E
manufacture of caustic soda