WASSCE CHEMISTRY MAY/JUNE  2014 (SSCE WAEC MAY/JUNE 2014 CHEMISTRY)

1. The shape of CH₄ is

A. linear

B. Planar

C. Pyramidal

D. tetrahedral

 

2. The crystal layers in graphite are held together by

A. covalent bond

B. electrostatic forces

C. ionic bond

D. van dar waal’s forces

 

3.  Hydrogen bonds are formed between molecules containing Hydrogen atom bonded to a

A. strongly electronegative atom

B. non-polar species

C. diatomic element

D. complex ion

 

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

 A. valence electrons

B. ionization energy

C. number of shell

D. atomic size

 

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

A. carbon dating

B. Irradiation of gamma rays

C. Nuclear fission

D. Nuclear fusion

 

6.Which of the following arrangement is in decreasing order of atomic radius?

A. Li > Be > C > B

B. Li > B > Be > C

C. Li > Be > B > C

D. C> B > Be > Li

 

7. The electron configuration of ₂₆Fe³⁺

 A. [Ar] 4s² 3d⁶

B. [Ar] 4s² 3d³

C. [Ar] 4s¹ 3d⁴

D. [Ar] 4s^o 3d⁵

 

8. Which of the following transition metals is not attracted to external magnetic field/

A. Cu

B. Fe

C. Ti

D. Zn

 

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

A. $_{18}^{17}W$

B.$_{17}^{18}W$

C. $_{17}^{35}W$

D. $_{18}^{35}W$

 

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

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

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

C. the element has strong oxidizing ability

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

 

11. NH₄⁺ is formed  from NH₃ and H⁺ by

A. covalent bonding

B.  dative bondig

C. hydrogen bonding

D. ionic bonding

 

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

A. 0

B. 1

C. 2

D. 3

 

13. An aqueous solution Na₂CO₃ is

A. acidic

B. alkaline

C. amphoteric

D. neutral

 

14. A gaseous mixture contain 0.256g of hydrogen and 2.00g of oxygen. The mole ratio of hydrogen to oxygen in the mixture is

A. 1:1

B. 2:1

C.1;4

D. 8:1

 

15.If 0.20mol dm^–3NaOH_(aq) was evaporated to yield 5.0g of solid NaOH, calculate the volume of NaOH_(aq) used [ Na=23.0, O =16.0]

A. 600cm³

B. 652cm³

C. 1000cm³

D. 1600cm³

 

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

A. +2

B. +3

C. +4

D. +6

 

17. The mass 800cm³ of a gas Q at s.t.p is 1.0g. What is the molar mass of Q?

[Avogadros constant =22.4 dm³mol^–1]

A. 18.0 g mol^–1

B. 22.4 g mol^–1

C. 28.0 g mol^–1

D. 36.0 g mol^–1

 

18. A compound U melts at 82^oC and boils at 113^oC. If U was found to be insoluble in water, a mixture of U in water could best be separated by

A. chromatography

B. sublimation

C. filtration

D. the use of separating funnel

 

19. The following set-up can be used to demonstrated

 

 

 

 

A. Diffusion 

B. dissolution

C. evaporation

D. sublimation

 

20. Which of the following  statement about a chemical syste, in equilibrium, is correct? The

A. reaction is irreversible

B. reaction goes to completion

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

D. equilibrium, is affected by a catalyst

 

21.  Which of the following relationships correctly expresses the Boyle’s law?

A. \[P\propto V\]at constant

B. $V\propto T$ at constant P

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

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

 

22. The vapour pressure of a given volume of liquid increases when the

A. liquid becomes saturated with a salt

B. volume of the liquid increases

C. temperature of the liquid falls

D. temperature of the liquid rises

 

23. Which of the following statement about volatile liquids is corrects? They are

A. high vapour pressure and low boiling point

B. high vapour pressure and high boiling point

C. low vapour pressure and low boiling point

D. low vapour pressure and high boiling point

 

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

A. electrical

B. heat

C. light

D. sound

 

25. Zinc oxide is said to be atmospheric because it

A. forms an acid salt

B.is an insoluble base

C. form a double salt

D. reacts with a base or an acid

 

26. Which of the following substance with the corresponding pH value is an alkali?

Substance                    pH

A. Lime                       2.4

B. Banana                   4.6

C. Distilled Water       7.0

D. Milk of Magnesia   10.5

 

27.The gases produced when Cu(NO₃)_2(aq) was heated are

A. NO and NO₂

B. O₂ and NO₂

C. O₂ and NO

D. NO₂ and N₂O₄

 

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

A.NH₄Cl_(g)

B. AlCl_3(s)

C. CH₃COONa_(s)

D.  NH₄NO_3(g)

 

29. Consider the reaction represented by the following equation

$N{{a}_{2}}C{{O}_{2(aq)}}+2HC{{l}_{(aq)}}\to 2NaC{{l}_{(aq)}}+{{H}_{2}}{{O}_{(l)}}+C{{O}_{2(g)}}$

What volume of 0.02mol dm^–3 Na₂ CO_3(aq)  would be required to completely neutralize 40 cm³ of 0.10 mol dm^–3 HCl_(aq)?

A. 200cm³

B. 100cm³

C. 40cm³

D. 20cm³

 

30. In which of the following experiment set-ups would the rate of evolution of hydrogen gas be fastest?

 

 

 

 

31. Which of the following factors would affect the equilibrium constant?

A. Concentration

B. Temperature

C. Pressure

D. Volume

 

32. Consider the following energy profile diagram of exothermic reaction

 

 

The enthalpy change ΔH^θ is

A. 120KJ mol^–1

B. 80 KJ mol^–1

C. 60KJ mol^–1

D. 40KJ mol^–1

 

33.  Consider the reaction represented by the following equation:

${{N}_{2(g)}}+3{{H}_{2(g)}}\rightleftharpoons 2N{{H}_{3(aq)}};\text{   }\Delta {{H}^{\theta }}=-xKJ\text{ mo}{{\text{l}}^{-1}}$

 Which of the following conditions would increase the yield of NH₃?

A. Addition of iron catalyst

B. Increase in the temperature of the system

C. Increase in the volume occupied by reactant

D. Increased in the total pressure of the system

 

34. What is the function of manganese (IV) oxide in the reaction represented by the following equation?

$Mn{{O}_{4}}+4HCl\to MnC{{l}_{2}}+2{{H}_{2}}O+C{{l}_{2}}$

A. Catalyst

B. Dehydrating agent

C. Oxidizing agent

D. Reducing agent

 

35. The reaction that occurs at the anode when CuSO_4(aq) is electrolyzed using carbon electrode is

A. $2{{H}^{+}}_{(aq)}+2e\to {{H}_{2(g)}}$

B. $C{{u}^{2+}}_{(aq)}+2e\to C{{u}_{(s)}}$

C.$4O{{H}_{(aq)}}-4e\to 2{{H}_{2}}{{O}_{(l)}}+{{O}_{2(g)}}$

D. $SO_{4(aq)}^{2}-2e\to S{{O}_{2(g)}}+{{O}_{2(g)}}$

 

36. Reduction is the process of

A. loss of electron

B. loss of hydrogen

C. loss of oxygen

D. addition of electronegative elements

 

37. Ethene molecule can be added to one another to form a long chain compound called a

A. dimer

B. monomer

C. polymer

D. trimer

 

38. Which of the following determines the octane rating of petrol

A.. 1, 2, 3 – trimethyl pentane

B. 2, 3, 5 – trimethyl octane

C. 2, 3, 5 – trimethyl pentane

D. 2, 2, 4 – trimethyl pentane

 

39. Which type of reaction is illustrated by the following equation?

${{C}_{12}}{{H}_{26}}\to 5{{C}_{2}}{{H}_{4}}+{{C}_{2}}{{H}_{6}}$

A. Addition

B. Cracking

C. Hydrogenation

D. Polymerization

 

40. The IUPAC name of the following organic compound is HOOC – COOH

A. ethan–1,2–dioic acid

B. ethanoic acid

C.oxalic acid

D. Propan–1,2–dioic acid

 

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

A. diastase

B. maltase

C. ptyalin

D. zymase

 

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

A. alkanol

B. benzene

C. ester

D. methane

 

43. Consider the reaction represented by the following equation:

${{C}_{2}}{{H}_{4(g)}}+3{{O}_{2}}\to 2C{{O}_{2(g)}}+2{{H}_{2}}{{O}_{(g)}}$

How many moles of ethenes 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

 

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

A. C₃H₆

B. C₅H₁₂

C. C₁₃H₂₈

D. C₂₀H₄₂

 

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

A. Ethanal

B. Ethane

C. Ethanol

D. Ethanoic acid

 

46. The production of biogas from the fermentation of waste material is an example of

A. combustion

B. incineration

C. refining

D. recycling

 

47. The purity of a solid sample can best be determine by its

A. boiling point

B. melting point

C. conductivity

D. solubility

 

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

A. Argon

B. Helium

C. Hydrogen

D. Oxygen

 

49. The most common process in the extraction of metal from their ore is

A. Catalysis

B. electrolysis

C. oxidation

D. reduction

 

50. The oxide from electric power station is

A. Carbon(IV) oxide

B. copper(II) oxide

C. nitrogen (IV) oxide

D. sulphur (IV) oxide