WAEC 2014 Chemistry Questions and Answers

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1. ï»¿The shape of CH4 is

  • Linear
  • Planar
  • Pyramidal
  • Tetrahedral

2. The crystal layers in graphite are held together by

  • Covalent bond
  • Electrostatic forces
  • Ionic bond
  • Vander Waals’ forces

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

  • Strongly electronegative atom
  • Non polar species
  • Diatomic element
  • Complex ion

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

  • Valence electron
  • Ionization energy
  • Number of shell
  • Atomic size

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

  • Carbon dating
  • Irradiation of gamma rays
  • Nuclear fission
  • Nuclear fusion

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

  • Li>Be>C>B
  • Li>B>Be>C
  • Li>Be>B>C
  • C>B>Be>Li

7. The electron configuration of 26Fe3+ is

  • [Ar] 4s23d6
  • [Ar] 4s23d3
  • [Ar] 4s13d4
  • [Ar] 4s03d5

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

  • Cu
  • Fe
  • Ti
  • Zn

9. An atom W has 17 electrons and 8 neutrons. Which of the following representations of the atom is corrected?

  • 17W18
  • 18W17
  • 35W17
  • 35W18

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

  • It is the weighted average mass of all its various isotopes
  • It is the average mass of all the isotopes of the element
  • The element has strong oxidising ability
  • The atom contains a higher number of neurons than electron

11. NH-4 is formed from NH3 and H- by

  • Covalent bonding
  • Dative bonding
  • Hydrogen bonding
  • Ionic bonding

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

  • 0
  • 1
  • 2
  • 3

13. An aqueous solution of Na2CO3 is

  • Acidic
  • Alkaline
  • Amphoteric
  • Neutral

14. A gaseous mixture contains 0.256g of hydrogen and 2.00g of oxygen. The mole ratio of hydrogen to oxygen in the mixture is [H= 1.00; O= 16.0]

  • 1:1
  • 2:1
  • 1:4
  • 8:1

15. If 0.20moldm-3 NaOH(aq) was evaporated to yield 5.0g of solid NaOH, calculate the volume of NaOH(aq) used [Na= 23.0, O= 16.00, H= 1.00]

  • 600cm3
  • 625cm3
  • 1000cm3
  • 1600cm3

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

  • +2
  • +3
  • +4
  • +6

17. The mass of 800cm3 0f gas Q at s.t.p is 1.0g. What is the molar mass of Q? [Avogadro’s constant = 22.4dm3mol-1]

  • 18. 0gmol-1
  • 22.4gmol-1
  • 28. 0gmol-1
  • 36.0gmol-1

18. A compound U melts at 820c and boils at 1130c. If U was found to be insoluble in water, a mixture of U in water could best be separate by

  • Chromatography
  • Sublimation
  • Filtration
  • The use of separation of funnel

19. The following set up can be used to demonstrate

  • Diffusion
  • Dissolution
  • Evaporation
  • Sublimation

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

  • Reaction is irreversible
  • Reaction goes to completion
  • Equilibrium is re-established when a stress is applied
  • Equilibrium position is affected by the catalyst

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

  • P α V at constant T
  • V α T at constant P
  • P α 1/V at constant T
  • V α 1/T at constant p

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

  • Liquid becomes saturated with salt
  • Volume of the liquid increases
  • Temperature of the liquid falls
  • Temperature of the liquid rises

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

  • High vapour pressure and low boiling point
  • High vapour pressure and a high boiling point
  • Low vapour pressure and a low boiling point
  • Low vapour pressure and a high boiling point

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

  • Forms an acid salt
  • Is an insoluble base
  • Forms a double salt
  • Reacts with a base or an acid
  • nc oxide is said to be amphoteric because it

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

  • Lime 2.4
  • Banana 4.6
  • Distilled water 7.0
  • Milk of Magnesia 10.5

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

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

  • NH4CL(s)
  • AlCl3(s)
  • CH3COONa(s)
  • NH4NO3(s)

28. Consider the reaction represented by the following equation: Na2CO3(aq) + 2HCl(aq) 2NaCl(aq) + H2O(l) + CO2(g) what is the volume of 0.02moldm-3 Na2CO3(aq) would be required to completely neutralize 40cm3 of 0.10moldm-3HCl(aq)?

  • 200cm3
  • 100cm3
  • 40cm3
  • 20m3

29. In which of the following experiments set ups would the rate of evolution of hydrogen gas be fastest?

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

  • Concentration
  • Temperature
  • Pressure
  • Volume

31. Consider the following energy profile diagram of exothermic reaction:The enthalpy change, ∆H is

  • 120kjmol-1
  • 80kjmol-1
  • 60kjmol-1
  • 40kjmol-1

32. Consider the reaction represented by the following equationN2(g) + 3H2(g) 2NH3(g) ; ∆H0 = -x kJ mol-1 which of the following conditions would increase the yield of NH3

  • Addition of iron catalyst
  • Increase in temperature of the system
  • Increase in the volume of the occupied reactants
  • Increase in the total pressure of the system

33. What is the function of manganese (IV) oxide in the reaction represented by the following equation MnO2 + 4HCl MnCl2 + 2H2O + Cl2

  • catalyst
  • Dehydrating agents
  • Oxidizing agent
  • Reducing agent

34. The reaction that occur at the anode when CuSO4(aq) is electrolyzed using carbon electrode is

  • 2H+(aq) + 2e H2(g)+
  • Cu2+(aq) + 2e Cu(s)+
  • 4OH(aq) – 4e 2H2O(l) + O2(g)
  • SO24(aq) – 2e SO2(g) + O2(g)

35. Reduction is the process of

  • Loss of electron
  • Loss of hydrogen
  • Loss of oxygen
  • Addition of electronegative elements

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

  • Dimer
  • Monomer
  • Polymer
  • Trimer

37. Which of the following compounds determines the octane rating of petro?

  • 1,2,3 – trimethyl pentane
  • 1,3,5 – trimethyl octane
  • 2,3,5- trimethyl pentane
  • 2,2,4 – trimethyl pentane

38. Which type of reaction is illustrated by the following equation? C12H26 5CH4 + C2H6

  • Addition
  • Cracking
  • Hydrogenation
  • Polymerization

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

  • Ethan- 1,2 – dioic acid
  • Ethanoic acid
  • Oxalic acid
  • Propan – 1,2 – dioic acid

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

  • Diastase
  • Maltase
  • Ptyalin
  • Zymase

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

  • Alkanol
  • Benzene
  • Ester
  • Methane

42. Consider the reaction represented by the following equation: C2H4(g) + 3O2(g) 2CO2(g) + 2H2O(g) How may moles of ethene would be burnt to produce 0.1 mole of water?

  • 0.05 mole
  • 0.10 mole
  • 0.20 mole
  • 2.00 mole

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

  • C3H8+
  • 5H12+
  • C13H28+
  • C20H42+

44. Which of the following organic compound could be represented by the empirical formula CH2O?

  • Ethanal
  • Ethane
  • Ethanol
  • Ethanoic acid

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

  • Combustion
  • Incineration
  • Refining
  • Recycling

46. The purity of a solid sample can best be determined by

  • Boiling point
  • Melting point
  • Conductivity
  • Solubility

47. Which of the following gases is used to retard the vapourization of the filament in a light bulb?

  • Argon
  • Helium
  • Hydrogen
  • Oxygen

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

  • Catalysis
  • Electrolysis
  • Oxidation
  • Reduction

49. The oxide from electric power station is

  • Carbon (IV) oxide
  • Copper (II) oxide
  • Nitrogen (IV) oxide
  • Sulphur (IV) oxide

50. Zinc oxide is said to be amphoteric because it

  • forms an acid salt
  • is an insoluble base
  • forms a double salt
  • reacts with a base or an acid

ANSWERS

  1. D
  2. D
  3. A
  4. A
  5. B
  6. C
  7. D
  8. A
  9. C
  10. B
  11. D
  12. B
  13. B
  14. B
  15. D
  16. C
  17. C
  18. A
  19. C
  20. C
  21. C
  22. D
  23. A
  24. C
  25. D
  26. B
  27. C
  28. A
  29. –
  30. C
  31. C
  32. D
  33. C
  34. C
  35. C
  36. C
  37. D
  38. B
  39. A
  40. D
  41. C
  42. A
  43. B
  44. D
  45. D
  46. B
  47. A
  48. D
  49. B
  50. D
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