ensofts


Candle Light To The World


BACK TO EN-SCHOOLCERT

CHEMISTRY (Objective Questions And Answers)


2019
2018
2017
2016
2015
2014
2013
2012
2011
2010
2009
2008
2007
2006
2005
more
THEORY QUESTIONS
WAEC SYLLABUS

WASSCE 2011

Objectives



1. How many isotopes has hydrogen?

A. 2

B.3

C.4

D.5


2. Which of the following electron configurations correctly represents an inert element?

A. Is2 2s2 2p4

B. Is2 2s2 2p6 3s2

C. Is2 2s2 2p6 3s2 3p4

D. Is2 2s2 2p6


3. What type of reaction is represented by the following equation?

2/1D + 3/1H ---> He4/2 + n + 1/0 energy

A. Nuclear fission

B. Nuclear fusion

C. Radioactive decay

D. Spontaneous decay


4. Which of the following ions has the electron configuration 2, 8 8?

A. Na+

B.Mg2+

C. F-

D.CI-


5. An element the with electron configuration Is2 2s2 2p6 would have a combining power of

A.O

B.2

C.6

D.8


ANSWERS

6. Rare gases are stable because they

A. contain equal number of protons and neutrons

B. contain more electrons than protons

C. are chemically active

D. have octet structure.


7. Which of the following elements would produce colored ions in aqueous solution?

A. Calcium

B. Iron

C. Magnesium

D. Sodium


8. The energy change that accompanies the addition of an electron to an isolated gaseous atom is

A. bond energy

B. electrongativity

C. electron affinity

D. ionization energy


9. Which of the following hydrohalic acids is the weakest?

A. HBr

B. HCI

C. HF

D. HI


10. Which of the following arrangements is in order of increasing metallic property?

A. Li < Na < K

B. Na < Li < K

C. K < Na < Li

D. K < Li < Na


ANSWERS

11. Chlorine, bromine and iodine belong to the same group and

A. are gaseous at room temperature

B. form white precipitate with AgN03(aq)

C. react violently with hydrogen without heating

D. react with alkali


12. Which of the following elements can conveniently be placed in two groups in the periodic table?

A. Carbon

B. Copper

C. Hydrogen

D. Oxygen


13. The bond formed when two electrons that are shared between two atoms are donated by only one of the atoms is

A. covalent

B. dative

C. ionic

D. metallic


14. When element 20A combines with element 8Y,

A. a covalent compound, AY is formed

B. an ionic compound, AY is formed

C. an ionic compound, A2Y is formed

D. a covalent compound, AY2 is formed


15. In metallic solids, the forces of attraction are between the mobile valence electrons and

A. atoms

B. neutrons

C. the negative ions

D. positively charged nuclei


ANSWERS

16. Which of the billowing statements about displacement reactions is correct?

A. A more electropositive element displaces a less electropositive one

B. A less electropositive element displaces a more electropositive one.

C. The position of elements in the reactivity series has no effect on the reaction.

D. It only occurs when the reaction is at equilibrium


17. The volume occupied by 17g of H2S at s.t.p. is [H = 1.00. S =32.0, Molar volume = 22.4 dm3]

A. 11.2 dm-

B. 17.0 dm3

C. 34.0 dm3

D. 44.8 dm3


18. Consider the reaction represented by the following equation: xKMn04(aq) + YSO2(g) + zH2O(1) ----> K2S04(aq) + 2MnS04(aq) + 2H2SO4(aq) x, v and c are respectively

A. 2, 5 and 2

B. 2, 2, and 5

C. 5, l and 2

D. 1, 5 and 2


19. What is the amount of magnesium that would contain 1.20 x 1024 particles? [Mg = 24, Avogadro's c 6.02 x 1

A. 0.5 moles

B. 2.0 moles

C. 12.0 moles

D. 24.0 moles


20. The number atoms in one mole of a substance is equal to the

A. Atons number

B. oxidation number

C. atomic number

D. Avogadro number


ANSWERS

21. Which of the following statements about a molar solution is correct? It

A. is a supersaturated solution

B. cannot dissolve more of the solute at that temperature

C. contains any amount of solute in a given volume of solution.

D. contains one mole of the solute in Idm3 of solution.


22. A gas that is collected by upward delivery is likely to be

A. heavier than air

B. insoluble in water

C. lighter than air

D. soluble in water


23. Bubling excess carbon (IV) oxide into calcium hydroxide solution results in the formation of

A. CaC03

B. CaO

C. Ca(HC03)2

D. H,CO,


24. The equation P = K illustrates V

A. Boyles's law

B. Charles' law

C. Dalton's law

D. Gay Lussac's law


25. The initial volume of a gas at 300 K was 220 cm3. Determine' temperature if the volume became 250 cm3

A. 183 K

B. 264 K

C. 300 K

D. 341 K


ANSWERS

26. Consider the following energy profile diagram





X Represents

A. activated complex

B. activation energy

C. enthalpy change

D. energy of reactant


27. Which of the following equimolar solutions has the high conductivity?

A. CH3COOH(aq)

B. H2C03(aq)

C. H2S04(aq)

D. NaOH(aq)


28. The colour of phenolphthalein indicator in alkaline solution the end-point of an acid-base titration is

A. colourless

B. orange

C. pink

D. yello


29. Which of the following statements about enthalphy of neutralization is correct? It

A. is constant for a strong acid and a strong base

B. cannot be determined using calorimeter

C. has a positive value

D. is higher for strong acid and a weak base


30. When NH4CI(s) was dissolved in water, the container was to touch. This implies that

A. the process is endothermic

B. the process is exothermic

C. NH4CI is highly soluble in water

D. NH4CI forms a saturated solution


ANSWERS

31. Which of the following metallic oxides is amphoteric1.A. AL03B. Fe203 C. MgOD. Na:0
32. On evaporation to dryness, 250 cm3 of saturated solution salt X with relative molar mass 101 gave 50.5 g of the salt. What is the solubility of the salt
A. 1.0 mol dm-3
B. 2.0 mol dm-3
C. 4.0 mol dm-3
D. 5.0 mol dm-3
33. Consider the following reaction equation: X(G) + Y(G) <====> XY(G) AH = + 220 kJmol-1 . If the temperature of the system is increased, the
A. Back Ward reaction would be favoured
B. forward reaction would be favoured
C. reaction would stop
D. reaction would be at equilibrium.
34. which of the following conditions would lead to an increase rate of a reaction?
A. Increase in temperature and decrease in the surface area of reactants.
B. Increase in both temperature and concentration of reactants
C. Decrease in temperature and increase in concentration of reactants
D. Decrease in temperature and increase in the surface area of reactants.
35. What is the value of n in the following equation? Cr2O72- + 14H+ + ne --- -> 2Cr3+ + 7H20
A. 2
B. 3
C. 6
D. 7

ANSWERS

36. What mass of copper would be formed when a current of 10.0 A is passed through a solution of CuS04 for 1 hour? [Cu = 63.5 IF = 96500 C]

A. 5.9g

B. 11.8g

C. 23.7g

D. 47.3g


37. of the following metals could be used as sacrificial for preventing the corrosion of iron?

A. Copper

B. Lead

C. Magnesium

D. Silver


38. Consider the following electrochemical cell notation: M(s) /M2+(aq) // H+(ag) I H2(aq) The value of the electrode potential is positive when

A. electrons flow from the metal electrode, Mw to hydrogen electrode, R2(g)

B. electrons flow from hydrogen electrode, H2,syto metal electrode, M(s)

C. flow of current is high

D. there is equilibrium between the flow of electrons from the hydrogen electrode, H2(g) to metal electrode, M(s)


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

A. 1, 2, 3 - trimethylpentane

B. 2,3,5 - trimethyloctane

C. 2, 3, 5- trimethylpentane

D. 2,2,4 - trimethlpehtane


40. Which of the following compounds would react with ethanoic give a sweet smelling liquid?

A. Alkane

B. Alkanol

C. Alkanal

D. Alkyne


ANSWERS

41. Which of the following separation techniques would show that black ink is a mixture of chemical compounds?

A. Crystallization

B. Chromatography

C. Filtration

D. Sublimation


42. The following substances are examples of addition polymer Except

A. nylon

B. perspex

C. ethane

D. polychloroethane


43. When bromine is added to ethene at room temperature, the compound formed is

A. 1, 1 - dibromoethane

B. 1,1 - dibromoethene

C. 1, 2 - dibromoethane

D. 1,2 - dibromoethene


44. Which of the following organic compounds would react with trioxocarbonate (IV) to liberate carbon (IV)oxide?





45. The compound that makes palm wine teste sour after exposure to the air for few days is

A. ethanol

B. ethanol acid

C. methanol

D. methanoic acid


ANSWERS

46. The reagent that can be used to distinguish ethene from Ethyne is

A. ammoniacal silver trioxonitrate (V) solution

B. Benedict solution

C. bromine water

D. Fehling's solution


47. The following substances are ores of metals except

A. bauxite

B. cuprite

C. cassiterite

D. graphite


48. Which of the following processes does not involve the use of limestone?

A. Extraction of iron in the blast furnace

B. Manufacture of tetraoxosulphate (VI) acid by contact process

C. Production of washing soda by Solvay process

D. Production of cement


49. Which of...: following substances is mainly responsible for the depletion of the ozone layer?

A. Chlorofluorocarbon

B. Carbon (IV) oxide

C. Nitrogen

D. Oxygen


50. Aluminium is extracted by electrolysis from

A. bauxite

B. cryolite

C. duralumin

D. kaolin



WASSCE JUNE 2011 CHEMISTRY OBJECTIVE TEST

ANSWERS

​1. B 2. D 3. B 5. A 6. D 10. A

11. D 12. C 13. B 14. B 15. D 16. A 17. A 18. A 19. B 20. D 21. D 22. C 23. C 24. A 25. D 26. B

27. C 28. A 29. A 30. A 31. A 32. B 33. B 34. B 35. C 36. B 37. C 38. A 39.D 40. B 41. B 42. A

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


To Top
Q 1-10
Q 11-20
Q 21-30
Q 31-40
Q 41-50
To 2010
To 2012
To En-Schoolcert

Special promotion!





GET 25% OFF Your first purchase!

Send us your name and email address and we'll send you a coupon!






submit

copyright:ensoft2024. company@en-soft.com Phone:2347072716127