2014 WAEC (WASSCE) Chemistry Past Questions & Answers

Question 1

Consider the reaction represented by the following equation: C2H4(g) + 302(g) → 2CO2(g) + 2H2O(g)How many moles of ethene would be burnt to produce 0.1 mole of water?

A.0.05 mole
B.0.10 mole
C.0.20 mole
D.2.00 moles

Show answer

Answer: A. 0.05 mole

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Accepted Answer

B. 100 cm3

Answer

A. 200 cm3

Answer

C. 40 cm3

Answer

D. 20 cm3

Question 2

Which type of reaction is illustrated by the following equation? C12H26 → 5C 2H4 + C 2H6

Accepted Answer

B. Cracking

Answer

A. Addition

Answer

C. Hydrogenation

Answer

D. Polymerization

Question 3

If 0.20 mol $dm^{-3}$ NaOH(aq) was evaporated to yield 5.0g of solid NaOH, calculate the volume of NaOH (aq) used. (Na = 23.0,O = 16:0; H = 1.00)

Accepted Answer

B. 625cm3

Answer

A. 600$cm^{-3}$

Answer

C. 10003

Answer

D. 1600 cm 3

Question 4

The production of biogas from the fermentation of waste materials is an example of

Accepted Answer

D. recycling

Answer

A. combustion

Answer

B. incineration

Answer

C. refining

Question 5

Which of the following processes is used in food preservation in an industry?

Accepted Answer

B. Ieeadiation of gamma rays

Answer

A. Carbon dating

Answer

C. Nuclear fission

Answer

D. Nuclear fusion

Question 6

The purity of a solid sample can best be determined by its?

Accepted Answer

B. melting point

Answer

A. boiling point

Answer

C. conductivity

Answer

D. solubility

Question 7

The oxidation number of sulphur in Fe2(SO4)3 is

Accepted Answer

D. +6.

Answer

A. +2.

Answer

B. +3

Answer

C. +4.

Question 8

The relative atomic mass of chlorine is not a whole number because

Accepted Answer

A. it is the weighted average mass of all its various isotopes

Answer

B. it is the average mass of all the isotopes of the element

Answer

C. the element has strong oxidizing ability

Answer

D. the atom contains a higher number of neutrons than protons

Question 9

Consider the reaction represented by the following equation: C2H4(g) + 302(g) → 2CO2(g) + 2H2O(g)How many moles of ethene would be burnt to produce 0.1 mole of water?

Accepted Answer

A. 0.05 mole

Answer

B. 0.10 mole

Answer

C. 0.20 mole

Answer

D. 2.00 moles

Question 10

Which of the following organic compounds could be represented by the empirical formula CH2O?

Accepted Answer

D. Ethanoic acid

Answer

A. Ethanal

Answer

B. Ethane

Answer

C. Ethanol

Question 11

The enzyme that catalyses the conversion of glucose te ethanol and carbon (IV) oxide is

Accepted Answer

D. zymase

Answer

A. diastase

Answer

B. maltase

Answer

C. ptyalin

Question 12

Zinc oxide is said to be amphoteric because it

Accepted Answer

D. reacts with a base or an acid

Answer

A. forms an acid salt

Answer

B. is an insoluble base

Answer

C. forms a double salt

Question 13

Which of the following compounds determines the octane rating of petrol?

Accepted Answer

D. 2,2,4 - trimethyl pentane

Answer

A. 1,2,3 - trimethyl pentane

Answer

B. 2,3,5 - trimethyl octane

Answer

C. 2,3,5 - trimethyl pentane

Question 14

Which of the following relationships correctly expresses the Boyle's law?

Accepted Answer

C. P $\alpha$ $\frac{1}{V}$ at constant T

Answer

A. P $\alpha$ V at constant T

Answer

B. V $\alpha$ T at constant P

Answer

D. V $\alpha$ $\frac{1}{T}$ at constant P

Question 15

Consider the reaction represented by the following equation: N2(g) + 3H2(g) ⇌ 2NH3(g); ∆Hϴ = -xkJ $mol^{-1}$. Which of the following conditions would increase the yield of NH3?

Accepted Answer

D. Increase in the total pressure of the system

Answer

A. Addition of iron catalyst

Answer

B. Increase in the temperature of the system

Answer

C. Increase in the volume occupied by reactants

Question 16

The gases produced when Cu(NO3)2(s) was heated are

Accepted Answer

D. O2 and NO2

Answer

A. NO and NO2

Answer

B. O2 and NO

Answer

C. NO2 and N2O4

Question 17

The two elements 11X and 19Y are in the same group because they have the same

Accepted Answer

A. valence electrons

Answer

B. ionization energy

Answer

C. number of shell

Answer

D. atomic size

Question 18

The crystal layers in graphite are held together by

Accepted Answer

D. van der Waal's forces

Answer

A. covalent bond

Answer

B. electrostatic forces

Answer

C. ionic bond

Question 19

Which of the following substances with the corresponding pH value is an alkali? Substance pH

Accepted Answer

D. Milk of magnesia  10.5

Answer

A. Lime   2.4

Answer

B. Banana  4.6

Answer

C. Distilled water  7.0

Question 20

Ethene molecules can be added to one another to form a long chain compound called a

Accepted Answer

C. polymer

Answer

A. dimer

Answer

B. monomer

Answer

D. trimer

Question 21

Hydrogen bonds are formed between molecules containing a hydrogen atom bonded to a

Accepted Answer

A. strongly electronegative atom

Answer

B. non-polar species

Answer

C. diatomic element

Answer

D. complex ion

Question 22

Which of the following statements about volatile liquids is correct? They have

Accepted Answer

A. high vapour pressure and low boiling point

Answer

B. high vapour pressure and high boling point

Answer

C. low vapour pressure and low boining point

Answer

D. low vapour pressure and high boiling point

Question 23

A colourless hydrocarbon with a sweet smell undergoes substitution reaction. The hydrocarbon is likely to be

Accepted Answer

B. benzene

Answer

A. alkanol

Answer

C. ester

Answer

D. methane

Question 24

NH4- is formed from NH3 and H- by

Accepted Answer

B. dative bonding

Answer

A. covalent bonding

Answer

C. hydrogen bonding

Answer

D. ionic bonding

Question 25

The liquid hydrocarbon likely to be found in the fraction of crude oil used for domestic cooking is?

Accepted Answer

C. C13H28

Answer

A. C3H8

Answer

B. C 5H 12

Answer

D. C20H42

Question 26

The electron configuration of $_{26}Fe^{3+}$ is?

Accepted Answer

D. [AR]4s03d5

Answer

A. [Ar]4s23d6

Answer

B. [AR]4s23d3

Answer

C. [AR]4s13d4

Question 27

The most common process in the extraction of metals from their ore is

Accepted Answer

D. reduction

Answer

A. catalysis

Answer

B. electrolysis

Answer

C. oxidation

Question 28

A gaseous mixture contains 0,256 g of hydrogen and 2.00 g of oxygen. The mole ration of hydrogen to oxygen in the mixture is (H=1.00; O=16,0)

Accepted Answer

B. 2:1

Answer

A. 1:1

Answer

C. 1:4

Answer

D. 8:1

Question 29

Which of the following statements about a chemical system in equilibrium is correct/ The

Accepted Answer

C. equilibrium is re-established when a stress is applied

Answer

A. reaction is irreversible

Answer

B. reaction goes to completion

Answer

D. equilibrium position is affected by catalyst

Question 30

Which of the following salts on hydrolysis would give an alkaline solution?

Accepted Answer

C. CH3COONa(s)

Answer

A. NH4CI(s)

Answer

B. AICI3(s)

Answer

D. NH4NO3(s)

Question 31

The IUPAC name of the following organic compound is HOOC - COOH

Accepted Answer

A. ethan - 1, 2 -dioc acid

Answer

B. ethanoic acid

Answer

C. oxalic acid

Answer

D. propan - 1,2-dioic acid

Question 32

Which of the following gases is used to retard the vaporization of the filament in a light bulb?

Accepted Answer

A. Argon

Answer

B. Helium

Answer

C. Hydrogen

Answer

D. Oxygen

Question 33

The reaction that occurs all the anode when CuSO4(aq) is electrolyzed using carbon electrode is

Accepted Answer

C. 4OH (aq) -4e → 2H2O(l) + O2 (g)

Answer

A. 2H - (aq) + 2e → H 2(g)

Answer

B. Cu2+ (aq) + 2e → Cu (s)

Answer

D. SO4(aq)2 -2e → SO 2(g) + O2(g)

Question 34

An atom W has 17 electrons and 18 neutrons. Which of the following representations of the atom is correct?

Accepted Answer

C. 3517W

Answer

A. 1718W

Answer

B. 1817W

Answer

D. 3518W

Question 35

The mass of 800cm3 of gas Q at s.t.p. is 1.0g. What is the molar mass of Q? [Avogadros constant = 22.4dm3 $mol^{-1}$`]

Accepted Answer

C. 28.0g$mol^{-1}$

Answer

A. 18.0 g$mol^{-1}$

Answer

B. 22,4g$mol^{-1}$

Answer

D. 36.0 g$mol^{-1}$

Question 36

An aqueous solution of Na2CO3 is

Accepted Answer

B. alkaline

Answer

A. acidic

Answer

C. amphoteric

Answer

D. neutral

Question 37

How many lone pair (s) of electrons is present in HF?

Accepted Answer

D. 3

Answer

A. o

Answer

B. 1

Answer

C. 2

Question 38

The shape of CH4 is

Accepted Answer

D. tetrahedral

Answer

A. linear

Answer

B. planar

Answer

C. pyramidal

Question 39

Reduction is the process of

Accepted Answer

C. loss of oxygen

Answer

A. loss of electron

Answer

B. loss of hydrogen

Answer

D. addition of electronegative elements

Question 40

The type of energy changes that accompany the mixing of a strong acid to a strong base is

Accepted Answer

B. heat

Answer

A. electrical

Answer

C. light

Answer

D. sound

Question 41

The oxide from electric power station is

Accepted Answer

D. sulphur (IV) oxide

Answer

A. carbon (IV) oxide

Answer

B. copper (ll) oxide

Answer

C. nitrogen (IV) oxide

Question 42

The vapour pressure of a given volume of liquid increase when the

Accepted Answer

D. temperature of the Liquid rises

Answer

A. liquid becomes saturated with a salt

Answer

B. Volume of the liquid increases

Answer

C. temperature of the liquid falls

Question 43

Which of the following factors would affect the equilibrium constant?

Accepted Answer

B. Temperature

Answer

A. Concentration

Answer

C. Pressure

Answer

D. Volume

Question 44

Which of the following transition metals is not attracted to external magnetic field?

Accepted Answer

D. Zn

Answer

A. Cu

Answer

B. Fe

Answer

C. Ti

Question 45

Which of the following arrangements is in decreasing order of atomic radius?

Accepted Answer

C. Li>Be>B>C

Answer

A. Li>Be>C>

Answer

B. Li>B>Be>C

Answer

D. C>B>Be>Li

2014 WAEC (WASSCE) Chemistry Past Questions

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