WASSCE CHEMISTRY MAY/JUNE 2017 (SSCE WAEC MAY/JUNE 2017 CHEMISTRY)

WASSCE CHEMISTRY MAY/JUNE  2017 (SSCE WAEC MAY/JUNE 2017 CHEMISTRY)

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

A. Electron

B. Neutron

C. Nucleus

D. Proton

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2. The following glasswares are used to measure the volume of liquids except

A. graduated beaker

B. pipette

C. test tube

D. burette

 

3. Pauli exclusion principle is related to

A. quantity of electrons in the valence shell

B. filling the orbitals with lower energy first

C. the filling of degenerated orbitals

D. quantum numbers of electrons

 

4. The species with no electron in the 3d-orbital is

A. Zn2+

B. Sc3+

C. Cu

D. Mn

 

5.. The separation of Nitrogen from oxygen using fractional distillation of air is possible because

A. nitrogen is less dense than oxygen

B. oxygen is more reactive than nitrogen

C. of the difference in their boiling points

D. they belong to the same period

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

A. boiling point

B. melting point

C. conductivity

D. solubility

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7. The mass of one mole of (NH4)2CO3 is   [O= 16.0, N=14.0, C=12.0, H=1.0]

A. 66.0g

B. 76.0g

C. 80.0g

D. 96.0g

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8. Atomic orbital is

A. the circular path 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 move

D. the path around the nucleus through which protons move

 

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9. The property of elements which increases down a group of the periodic table is

A. electronegativity

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 increases while the outermost electrons are drawn 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 valence shell remains constant

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

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

A. +2

B. +3

C. +4

D. +5

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

A. Na, Al, P, Cl

B. Cl, P, Al, Na

C. Na, P, Cl, Al

D. Al, Na, P, Cl

 

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13. Which of the following metals has the strongest metallic bond?

A. 19K

B. 13Al

C. 12Mg

D. 11Na

 

14. Which of the following substances does not have van der Waals' forces?

A. Copper

B. Graphite

C. Neon

D. Iodine crystals

 

15. The oxidation number of X  in  is

A. +1

B. +3

C. +4

D. +5

 

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

A. distance of the outermost electron(s) from the nucleus

B. size of the positive nuclear charge

C. ability to attract shared electron(s)

D. screening effect of the inner electron(s)

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17. Which of the following statements 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 in solution would conduct electricity

 

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

A. 180.0°

B. 109.5°

C. 105.5°

D. 90.0°

 

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

A. high molecular mass

B. low molecular mass

C. high degree of purity

D. readily available

 

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

A. high melting point

B. hardness

C. octahedral shape

D. durability

 

21. Which of the following statements 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. A 0.1moldm−3 solution of sodium hydroxide was diluted with distilled water to 0.001moldm−3.What is the dilution factor?

A. 1000.00

B. 100.00

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(IV) oxide on combustion

D. conduct electricity

 

24. In a saturated solution at a given temperature, the undissolved solutes 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 2.5moles of a triatomic gas is equivalent to 

 [1mole = 6.02×1023]

A. 2.5×1023

B. 1.5×1023

C. 1.5×1024

D. 2.5×1024

 

26. When Magnesium reacts with oxygen, heat is 

A. absorbed and the reaction is endothermic

B. evolved and the reaction is endothermic

C. evolved and the reaction is exothermic

D absorbed and the reaction is exothermic 2

 

27. Which of the following gases is not acidic?

A. SO3

B. NO2

C. CO2

D. CO

 

28. A hydrocarbon contained 14.3% hydrogen. The empirical formula for the hydrocarbon is   [H= 1.0, C= 12.0]

A. CH

B. CH2

C. CH3

D. CH4

 

29. Halogens generally react with metals to form

A. alkalis

B. acids

C. bases

D. salts

 

30. Which of the following statements is NOT a chemical property of an acid?

A. Evolution of ammonia when heated with ammonium salts

B. Evolution of carbon dioxide gas when added to a trioxocarbonate (IV) salt

C. Formation of salt and water with alkalis

D. Formation of salt and hydrogen gas with reactive metals

 

31. Potassium Chloride solid does not conduct electricity because

A. it is a covalent compound

B. strong cohesive forces make its ions immobile

C. strong cohesive force makes its molecule immobile

D. each of potassium and chlorine structures contain noble gas structure

 

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

A. CuSO4

B. FeSO4

C. Na2SO4

D. PbSO4

 

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

A. amount of crystals formed

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 a salt is required to saturate 200cm3 of water at room temperature, what is the solubility of the salt?

A. 0.2gdm−3

B. 1.0gdm−3

C. 2.0gdm−3

D. 5.0gdm−3

 

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

A. activation energy

B. free energy

C. equilibrium position

D. enthalpy change

 

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

A. neutralization

B. reaction of an acid with trioxocarbonate(IV) salt

C. double decomposition

D. reaction of an acid with electropositive metals

 

37. Chemical reactions occurs when the colliding reactants have energy that is

A. less than the activation energy

B. greater than the activation energy

C. greater than the energy of the product

D. less than the energy of effective collision

 

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 characterize members of the same homologous series?

A. The chemical property change gradually throughout the series

B. physical properties of members are similar

C. They have the same molecular formular

D. Successive members undergo changes in molecular formula by CH2

 

41. Calculate the mass of copper deposited if a current of 0.45A flows through CuSO4 solution for 1hour 15mins.   [Cu= 64.0, S= 32.0, O =16.0, 1F= 96500C]

A. 6.40g

B. 0.67g

C. 0.64g

D. 0.45g

 

42. Classification of alkanols is based on the 

A. number of carbon atoms present 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. propyl pentanoate

B. pentyl propanoate

C. butyl propanoate

D. propyl butanoate

 

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

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

B. Carbon(IV) oxide and Nitrogen

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

D. Carbon(II) oxide and oxygen

 

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

A. paraffin oil

B. animals

C. groundnuts

D. palm kernel

 

46. The condensation of two units of glucose will produce a disaccharide with the formula C12H22O11 which is

A. sucrose

B. maltose

C. galactose

D. mannose

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47. The IUPAC name for the compound ClCH2CH2OH is

A. 1- chloropropanol

B. 2-chloropropanol

C. 1-chloroethanol

D. 2-chloroethanol

 

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

A. excessive ultraviolet light from the sun to reach the earth 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

 

49.49

 

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

A. A

B. B

C. C

D. D

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

A. is formed naturally

B. is cheap

C. can be recycled after use

D. cannot be regenerated once used up

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