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CHEMISTRY (Objective Questions And Answers)


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THEORY QUESTIONS
WAEC SYLLABUS

WASSCE 2014

Objectives



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 der Waal's forces.


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

A. strongly electronegative atom.

B. non-polar species.

C. diatomic element.

D. complex ion.


4. The two elements, „X 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


ANSWERS

6. Which of the following arrangements 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+ is

A.[Ar]4s23d6

B.[Ar]4s23d3

C. [Ar]4s'3d4

D. [Ar] 4s°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 representations of the atom is correct?

A. 17W/18

B. 18/17

C. (18/17)W

D. (35/18)W


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

A. it is the 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.


ANSWERS

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

A. covalent bonding.

B. dative bonding

C. hydrogen bonding.

D. neutral.


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

A. 0

B. 1

C. 2

D. 3


13. An aqueous solution of NajCOg is

A. acidic.

B. alkaline.

C. amphoteric.

D. neutral.


14. A gaseous mixture contain 0.256 g of hydrogen and 2.00 g of oxygen. The mole ratio of hydrogen to oxygen in the mixture is [H = 1.00 0= 16.0]

A. 1:1

B. 2:1

C. 1:4

D. 8:1


15. If 0.20 mol dm-3 NaOH(aq) was evaporated to yield 5.0 g of solid NaOH, calculate the volume of NaOH(aq) used. [ Na = 23.0, O = 16.0 H = 1.00]

A. 600 cm3

B. 652 cm3

C.1000 cm3

D.1600 cm3


ANSWERS

16. The oxidation number of sulphur in Fe2(S04)3 is

A. +2

B. +3

C. +4

D.+6


17. The mass 800 cm3 of a gas Q at s.t.p. is 1.0g. What is the molar mass of Q? [ Avogadros c 22.4 dm3 mol-1]

A. 18.0 g mol-

B. 22.4 gmol-

C. 28.0 gmol-

D. 36.0 gmol-


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

A. Hydrogen

B. dissolution.

C. Filtration

D. sublimation


19. The following set-up can be used to demonstrate Hydrogen Bromine vapour





A. diffusion.

B. Dissolution

C. evaporation.

D. Sublimation.


20. Which of the following statements about a chemical system 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 position is affected by catalyst


ANSWERS

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

A. D. V a 1 at constant P T

B. V a T at constant P

C. P a 1/V at constant T

D. P a 1/V at constant T


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 statements about volatile liquids is correct? They have

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 amphoteric because it

A. forms an acid salt.

B. is an insoluble base.

C. forms a double salt.

D. reacts with a base or an acid.


ANSWERS

26. Which of the following substances 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 10/6


27 The gases produced when Cu(N03)2W was heated are

A. NO and N02

B. 02 and N»02

C. 02 and NO.

D. N02 and tijQ*-


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

A. NH4CI(s)

B. AICI3(s)

C. CH3COONa(s)

D. NH2N03(s)


29. Consider the reaction represented by the equation: Na2C03(aq) + 2HCI(aq) 2NaCI(aq) H2O(1) + CO2(g), What volume of 0.02 mol dm-3 Na2CO3(aq) would be required to completely neutralize 49 cm3 of 0.10 mol dm-3 HCI(aq)?

A. 200 cm3

B. 100 cm3

C. 40 cm3

D. 20 cm3


30. In which of the following experimental set-ups of evolution of hydrogen gas be fastest?​




ANSWERS

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

A. Concentration

B. Temperature

C. Presure

D. Volume


32. Consider the following energy profile diagram of excithermic reaction.





The enthalpy change. H0 is

A. 120 kj mol-1

B. 80 kj mol-1

C. 60 kj mol-1

D. 40 kj mol-1


33. Consider the reaction represented by the following equation:

N2(g) + 3H2(g) <=====> 2NH3(aq) HØ = -x kj mol-1 What 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 reactants

D. Increase in the total pressure of the system


34. What is the function of manganese (IV) oxide in the reaction represented by the following equation? Mn02 + 4HCI ======> MnCI2 + 2H20 +CI2

A. Catalyst

B. Dehydrating agent

C. Oxidizing agent

D. Reduccing agent


35. The reaction that occours at the anode when CuSO4(aq) is electrolyzed using carbon electrodes is

A. 2H- (aq) + 2e H2(g)

B. Cu2- (aq) _ 2e Cu(s)

C. 4OH (aq) – 4e 2H2O(1) + O2(g)

D.


ANSWERS

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 molecules 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 compounds 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?

C12 H26 <======> 5C2H4 + C2H8

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. 1

D. propan-1, 2-dioic acid.


ANSWERS

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 a 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:

C2H4(g) + 302(g) ----------->2C02(g) + 2H2O(g) How many moles of ethene would be burnt to produce 0.1 mole of water?

A. 0.05 mole

B. O.1O 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. C3H8

B. C5H12

C. C13H28

D. C20H42.


45. Which of the following organic compounds could be represented by the empirical formula CH20?

A. Ethanal

B. Ethane

C. Ethanol

D. Ethanoic acid


ANSWERS

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

A. combustion.

B. incineration.

C. refining.

D. recycling.


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

A. boiling point.

B. melting point.

C. conductivity.

D. solubility.


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

A. Argon

B. Helium

C. Hydrogen

D. Oxygen


49. The most common process in the extraction of metals 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



WASSCE JUNE 2014 CHEMISTRY OBJECTIVE TEST

ANSWERS

​1. D 2 D 3. A 4. A 5. B 6. B 7. B 8. D 9. C 10 A

11. B 12. D 13. B 14. B 15. B 16. D 17. C 18. B 19. A 20. C

21. C 22. D 23. A 24. B 25. D 26. D 27. B 28. C 29. B 30. D

31. A 32. C 33. D 34. C 35. B 36. C 37. C 38. D 39. B 40. A

41. D 42. B 43. A 44. A 45. D 46. D 47. B 48. A 49. D 50. A


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