2010 WAEC (WASSCE) Chemistry Past Questions & Answers

Question 1

The products of fermentation of sugar are

Accepted Answer

B. ethanol and carbon (IV) oxide

Answer

A. carbon(IV) oxide and water

Answer

C. ethanol and water

Answer

D. ethanol and enzymes

Question 2

The rate of chemical reaction of solids are not affected by

Accepted Answer

B. pressure

Answer

A. catalyst

Answer

C. particle size

Answer

D. temperature

Question 3

Which of the following substances cannot be classified as a heavy chemical?

Accepted Answer

A. AgNO3

Answer

B. CaO

Answer

C. CaOCI2

Answer

D. H2SO4

Question 4

The following substances are normal salts except

Accepted Answer

C. Mg(OH)NO3

Answer

A. AI(NO3)3

Answer

B. FeSO4

Answer

D. NaCI

Question 5

Which of the following apparatus can be used to measure accurately a specific volume of a liquid?

Accepted Answer

D. Pipette

Answer

A. Beaker

Answer

B. Conical flask

Answer

C. Measuring cylinder

Question 6

An organic compound contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen. What is the empirical formula of the compound? [O = 16.0, C = 12.0, H = 1.0]

Accepted Answer

C. CH2O

Answer

A. C2HO

Answer

B. CHO

Answer

D. CHO2

Question 7

A solution of sodium trioxocarbonate (IV) contains 10.6g in 250cm3 of solution. Calculate the concentration of the solution. [Na2CO3 = 106.0]

Accepted Answer

A. 0.4 mol $dm^{-3}$

Answer

B. 1.0 mol $dm^{-3}$

Answer

C. 10.6 mol $dm^{-3}$

Answer

D. 25.0 mol $dm^{-3}$

Question 8

If X is a group lll element, its oxide would be represented as

Accepted Answer

C. X2O3

Answer

A. X3O2

Answer

B. X3O

Answer

D. XO3

Question 9

Which of the following gases contains the highest number of atoms at s.t.p?

Accepted Answer

D. 1 mole of ethane

Answer

A. 6 moles of neon

Answer

B. 3 moles of oxygen

Answer

C. 2 moles of chlorine

Question 10

Fact and oils are used as raw materials in the following industries except

Accepted Answer

B. plastic industry

Answer

A. paint industry

Answer

C. margarine industry

Answer

D. cosmetics industry

Question 11

The main function of limestone in the blast furnance is to

Accepted Answer

C. remove impurities

Answer

A. act as a reducing agent

Answer

B. act as a catalyst

Answer

D. supply carbon (IV) oxide

Question 12

Which of the following metals exists as liquid at ordinary temperature?

Accepted Answer

C. Mercury

Answer

A. Copper

Answer

B. Gold

Answer

D. Silver

Question 13

Which of the following species correctly represented an ion of M with 13 protons and 10 electrons?

Accepted Answer

C. 13M 3+

Answer

A. 10M 3+

Answer

B. 10M 3-

Answer

D. 13M 3-

Question 14

The bonds in crystaline ammonium chloride are?

Accepted Answer

C. ionic covalent and dative

Answer

A. covalent and dative

Answer

B. ionic and covalent

Answer

D. ionic covalent and hydrogen bond

Question 15

Consider the neutralization reaction represented by the following equation: Na2CO3 + 2HNO 3 → 2NaNO3 + H2O + CO2 The stoichiometric ratio of acid to base is

Accepted Answer

B. 2:1

Answer

A. 2:2

Answer

C. 1:2

Answer

D. 1:1

Question 16

The minimum amount of energy required for effective collisions between reacting particles is known as

Accepted Answer

A. activation energy

Answer

B. bond energy

Answer

C. kinetic energy

Answer

D. potential energy

Question 17

Which of the following chlorides is insoluble in water?

Accepted Answer

A. AgCI

Answer

B. KCI

Answer

C. NH4CI

Answer

D. ZnCI2

Question 18

Which of the following equimolar solutions would have the highest conductivity?

Accepted Answer

D. AI(NO3)3(aq)

Answer

A. NH4NO3(aq)

Answer

B. NaNO3(aq)

Answer

C. Mg(NO3)2(aq)

Question 19

The energy change which accompanies the addition of an electron to a gaseous atom is

Accepted Answer

B. electron affinity

Answer

A. atomization

Answer

C. electronegativity

Answer

D. ionization

Question 20

The IUPAC name of C2H6COOC2,/sub>H6 is

Accepted Answer

B. ethylproanoate

Answer

A. ethyethanoate

Answer

C. propylethanoate

Answer

D. propylpropanoate

Question 21

Which of the following statements about the cell notation Mg/Mg$^{2+}$//Cu$^{2+}$/Cu is correct?

Accepted Answer

C. Magnesium is the anode

Answer

A. copper is the anode

Answer

B. Manesium is reduced

Answer

D. The double line represents the electrodes

Question 22

A given volume of oxygen diffused through a porous partition in 8 seconds. How long would it take the same volume of carbon (IV) oxide to diffuse under the same condition? [C = 12.0, O = 16.0]

Accepted Answer

C. 9.4 seconds

Answer

A. 5.8 seconds

Answer

B. 6.8 seconds

Answer

D. 11.0 seconds

Question 23

What is the change in oxidation number of manganes in the reaction represented by the following equation? MnO-4(aq) + 8H+(aq) + 5e- → Mn2+(aq) + 4H2O(l)

Accepted Answer

D. + 7 to 2

Answer

A. +3 to + 2

Answer

B. + 4 to + 2

Answer

C. + 5 to + 2

Question 24

Which of the following molecules has a triple bond in its structure?

Accepted Answer

C. N2

Answer

A. CH4

Answer

B. NH3

Answer

D. O 2

Question 25

Which of the following statements about the electrolysis of CuSO4(aq) using copper cathode and platinum anode is not correct?

Accepted Answer

C. it is used for the purification of copper

Answer

A. Copper is deposited at the cathode

Answer

B. Oxygen is liberated at the anode

Answer

D. The solution becomes acidic

Question 26

Consider the equilibrium reaction represented by the following equation: 2SO2(g) + O2(g) ⇌ 2SO3(g); ∆H = 395.7 kJ$mol^{-1}$ Which of the following statements about the equilibrium system is correct?

Accepted Answer

C. Decrease in pressure increases the equilibrium concentration of O2

Answer

A. Addition of catalyst changes the equailibrium position

Answer

B. Decrease in pressure increase in temperature SO3

Answer

D. Increase in temperatur favours the forward reaction

Question 27

Which of the following statements about chlorine and iodine at room temperature is correct?

Accepted Answer

A. Chlorine is gas and iodine is solid

Answer

B. Chlorine is liquid and iodine is gas

Answer

C. Chlorine and iodine are gases

Answer

D. Chlorine is solid and iodine is liquid

Question 28

Which of the following equations represents beta decay?

Accepted Answer

C. $\frac{8238}{92}$U → $\frac{239}{93}$Np + $\frac{0}{-1}$e

Answer

A. $\frac{14}{7}$N + $\frac{4}{2}$He → $\frac{8}{17}$O + $\frac{1}{1}$H

Answer

B. $\frac{8238}{92}$U → $\frac{234}{90}$Th + $\frac{4}{2}$He

Answer

D. $\frac{13}{7}$N + $\frac{4}{2}$He → $\frac{16}{8}$O + $\frac{1}{1}$H

Question 29

What is the volume occupied by 2 moles of ammonia at s.t.p?

Accepted Answer

A. 44.8 $dm^{-3}$

Answer

B. 22.4 $dm^{-3}$

Answer

C. 11.2 $dm^{-3}$

Answer

D. 5.6 $dm^{-3}$

Question 30

The quantity of electricity required to discharge 1 mole of univalent ion is

Accepted Answer

C. 96,500 C

Answer

A. 9,600 C

Answer

B. 48,250 C

Answer

D. 193,00 C

Question 31

A solid substance with high melting and boiling points is likely to be a/an

Accepted Answer

C. electrovalent compound

Answer

A. covalent compound

Answer

B. dative covalent compound

Answer

D. non-metal

Question 32

Compound N reacts with sodium metal to produce a gas that gives a 'pop' sound with a burning splint N also react with ethanoic acid to give a sweet smelling liquid. Compound N is an

Accepted Answer

A. alkanol

Answer

B. alkanoate

Answer

C. alkane

Answer

D. alkanoic acid

Question 33

Which of the following elements is a d-block element?

Accepted Answer

B. lron

Answer

A. Calcium

Answer

C. Lithium

Answer

D. Silicon

Question 34

Which of the following molecules has a linear shape?

Accepted Answer

B. CO 2

Answer

A. CH4

Answer

C. H2S

Answer

D. NH 3

Question 35

Which of the following factors would not affect the solubility of a gas?

Accepted Answer

A. Concentration

Answer

B. Nature of solvent

Answer

C. Pressure

Answer

D. Temperature

Question 36

An advantage of detergent over soap is that detergents

Accepted Answer

D. lather readily with water

Answer

A. are readily available

Answer

B. are in powerdered from

Answer

C. are non-biodegradable

Question 37

Which of the following oxides is basic?

Accepted Answer

D. CaO

Answer

A. NO2

Answer

B. AI2O3

Answer

C. SO2

Question 38

The determination of heat of combustion is carried out with

Accepted Answer

B. a bomb calorimeter

Answer

A. a thermometer

Answer

C. an evaporating dish

Answer

D. a boiling tube

2010 WAEC (WASSCE) Chemistry Past Questions

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