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CHEMISTRY (Objective Questions And Answers)


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THEORY QUESTIONS
WAEC SYLLABUS

WASSCE 2017

Objectives



1. Which of the following spices determines the chemical properties of an atom?

A. Electron.

B. Neutron.

C. Nucleus.

D. Proton


2. The following glass wares are used to measured the volume of liquids except.

A. Graduated Breaker.

B. Pipette.

C. Test tube.

D. Burette.


3. Pauli exclusion principle is related to

A. Quantity of electrons in the valence Sheila

B. Filling the Orbital with lower energy first

C. The filling of degenerated orbital

D. Quantum number of electrons


4. The spices with no electrons in the 3d-orbital is

A. Zn2+

B. NSc2+

C. Cu

D. Mn


5. The separation of oxygen from nitrogen by fractional distribution of air is possible because?

A. Nitrogen is less dense then oxygen

B. Oxygen is more reactive then nitrogen

C. Of the difference in their period

D. They belong to the same period


ANSWERS

6. The purity of solid sample can best be determined by its?

A. Boiling point.

B. Melting point.

C. Conductivity.

D. Solubility


7. The mass of one mole of (NH4)2CO3 is [O = 16.0, n = 14.0, h = 1.0]

A. 66.0g

B. 79.0g

C. 80.0g

D. 96.0g


8. Atomic orbital is?

A. The circular part through which electrons revolve round the nucleus

B. A region around the nucleus where electrons are most likely to be found.

C. The path around the nucleus through which electrons are move

D. The path around the nucleus through which protons move.


9. The property of elements which increases a group of the periodic Table is?

A. Electro negativity.

B. Electron affinity.

C. ionic radius.

D. ionization energy.


10. The reason for the decrease in the atomic size of elements across a period is that.

A. Nuclear charge increase, while the outermost electrons are dawn closer to the nucleus.

B. Nuclear charge decreases while the outermost electrons are drawn closer to the nucleus.

C. Valence electrons increase across the period while the valance shell remains constant.

D. Nuclear charge decreases while the distance of the valence shell from the nucleus is increasing.


ANSWERS

11. The oxidation number of nitrogen in pb(NO3)2 is

A. +2

B. +3

C. +4

D. +5


12. Which of the following arrangements indicates the correct decreasing order of ionization energy of period 3 elements?

A. Na, AI,P,CI

B. CI. P. AI Na

C. Na P,CI.AI.

D. AI,


13. Which of the following metals has the Strongest metallic bond/

A. 19k

B. 13AI

C. 12Mg

D. 11Na


14. Which of the following substances does not have Vander waal’s forces?

A. Copper.

B. Graphite

C. Neon

D. iodine crystals


15. The oxidation number of X in XO3- is

A. +1

B. +3

C. +4

D. +5


ANSWERS

16. The ionization energy is affected by the following factors except.

A. Distance of the outmost electrons from the nucleus

B. Size of the positive nuclear charge

C. ability to attract shared electrons

D. Screening effect of the inner electrons


17. Which of the following statement is correct?

A. Covalent compounds would readily ionize in solution

B. Covalent compounds consist of ions

C. Hydrogen bond is formed between a metal and a non-metal

D. Ionic compounds is formed between a metal and non-metal


18. The bond angle in tetrahedral molecules such as tetrechlormethane is.

A. 180.00

B.1090

C.105.50

D.90.00


19. The properties of a good primary standard include the following except.

A. High molecular mass.

B. low molecular mass.

C. high degrees of purity.

D. readily available


20. The use of diamond in abrasive is due to its.

A. High melting point.

B. hardness.

C. octahedral shape.

D. durability


ANSWERS

21. Which of the following statement about endothermic reaction is correct?

A. Activation energy is high.

B. A catalyst is required.

C. it occurs reversibly.

D. Heat energy is absorbed.


22. A0.1 moldm-3 solution of sodium hydroxide was diluted with distilled water to 0.001 moldm-3. What is the dilution factor?

A. 1000.00

B. 100.000

C.10.00

D. 0..01


23. Graphite and diamond are similar in that they.

A. Have octahedral shape.

B. have same density.

C. form carbon (vi) oxide on combustion.

D. conduct electricity.


24. In a saturated solution at a given temperature the undissolved solution are in equilibrium with.

A. The solvent.

B. Dissolved solute particles.

C. the saturated solution.

D. insoluble solute particles


25. The number of atoms present in 2.5mles of a triatomic gas is equivalent [1molse = 6.0 x 1023]

A. 2.5 x1023

B. 1.5 X 1023

C. 1.5 X 1024

D. 2.5 X 1024


ANSWERS

26. When magnesium reaction with oxygen, heat is.

A. Absorbed and the reaction is endothermic

B. Evolved and the reaction endothermic

C. Evolved and the reaction is exothermic

D. Absorbed and the reaction is exothermic


27. Which of the following gas is not acid?

A. NO2

B. SO2

C. CO2

D. CO


28. A hydrocarbon contained 14.3% hydrogen. He empirical formula of the hydrocarbon would be [C=12, H = 1]

A. CH2

B. CH2

C. CH2

D. CH2


29. Which of the following statement is not a chemical property of an acid?

A. Evolution of ammonia gas when heated with ammonium salts.

B. Evolution of COZ gas when added to Trioxocarbon(IV) salts.

C. Formation of salts and water with alkalis

D. Formation of salts and hydrogen gas with reactive metals


30. Halogens generally react with metals to form.

A. Alkalis.

B. Acids.

C. Base

D. salts


ANSWERS

31. Potassium Chloride solid does not conduct electricity because?

A. It is a covalent compound

B. Strong cohesive forces make its immobile

C. Strong cohesive forces make its molecules immobile

D. Each of potassium and chloride ions has noble gas structure.


32. When water was added to a white anhydrous substance X, the color changed to blue x is.

A. CuSO4

B. FESo4

C. Na2SO4

D. pbSO4


33. Solubility curve can be applied in the determination of the.

A. Amount of crystal found

B. Amount of solvent that can be recovered

C. Amount of solid drugs in a given solution

D. Temperature of the solution


34. If 0.2g of salt is required to saturate 200cm3 of water at room temperature, what is the solubility of the salt?

A. 0.2sdm-3

B. 1.0gm-3

C. 2.0gdm-3

D. 5.0gdm-3


35. The property of chemical reaction that is affected by a catalyst is the.

A. Activation energy.

B. free energy.

C. Equilibrium energy.

D. Enthalpy change.


ANSWERS

36. Soluble salts can be prepared by the following methods except.

A. Neutralization

B. Reaction of an acid with trioxocarborn(IV) salt.

C. Double decomposition

D. Reaction of an acid with electropositive metals


37. A chemical reaction occurs when the colliding reactions have energy that is.

A. Less than the activities energy

B. Greater than the activities energy

C. Greater than the energy of the product

D. Less than the energy of the effective collusion


38. The common feature of reactions at the anode is that.

A. Electrons are consumed.

B. ions are reduced.

C. oxidation is involved.

D. the electrode dissolves


39. Consider the following reaction equation: 2NO(g) + O2(g) →2NO2(g). What is the change in the oxidation number of nitrogen?

A. +2 to 0

B. +2 to -2

C. +2 to +4

D. +4 to +2


40. Which of the following factors characteristic changed members of the same homologous series?

A. The chemical property changes gradually throughout the series

B. Physical properties of members are similar

C. They have the same molecular formula

D. Successive members undergo changed on molecules formula by CH2


ANSWERS

41. Calculate the mass of copper deposited if a current a 0.45ampere flows through CuSO4 solution for 1 hour 1.5minutes. [Cu =64.0, S = 32.0 = 16.0, IF = 96500C]

A. 6.040g

B. 0.67g

C. 0.64g

D.0.45g


42. Classification of the alkanols is based on the.

A. Number of carbon atoms presented in the compound

B. Molecular mass of the compound

C. Molecular formula of the compound

D. Number of alkyl groups bonded to the carbon having the hydroxyl group


43. The name of the compound C4H9COOC3H7 is?

A. Proply pentanoate.

B. pentyl propanoate.

C. butyl propanoate.

D. propyl butanoate


44. Which of the following pairs of gases are pollutions from car exhaust?

A. Nitrogen(II)oxide and Carbon(IV)oxide

B. Carbon(IV)oxide and Nitrogen

C. Carbon(II)oxide Sulphur(IV)oxide

D. Carbon(ii)oxide and oxygen


45. Fats and oils can be obtained from any of the following source except?

A. Paraffin Oil.

B. Animals

C. Groundnuts

D. Palm Kernel


ANSWERS

46. The condensation of two units of glucose will produce a disaccharide with the formula. C12H22OH which is

A. Sucrose

B. Maltose

C. Galactose.

D. Mannose


47. The IUPAC name for the compound CICH2CH2OH is

A. I-Chloropropanol

B. l-Chloropropanol

C. 2-Chloroethanol

D. 2- Chloroethanol


48. The real harmful effect of the release of chlorofluocarbons into the atmosphere is that it eventually causes.

A. Excessive ultraviolet light from the sun to each the reach surface.

B. Excessive release of infrared light from the sun to the earth surface

C. Corrosive effect of the chemicals on humans and animals

D. Acidic effect of chemicals on humans.


49. A primary alkanol has a molecular mass of 60. What is the structural formula of the compound? [H =1.0, C=12.0, O = 16.0]

A. H H H H

H C C C C OH

H H H H


B. H H H

HO C C C H

H H H


C. H H

H C C OH

H H


D. H H H

H C C C H

H H H


50. Petroleum is a non- renewable sources of energy because it.

A. Is formed naturally.

B. is cheap.

C. can be recycled after use.

D. cannot ne regenerated once used up.



WASSCE JUNE 2017 CHEMISTRY OBJECTIVE TEST

ANSWERS

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

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

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

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

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


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