WASSCE CHEMISTRY MAY/JUNE 2010 (SSCE WAEC MAY/JUNE 2010 CHEMISTRY)

WASSCE CHEMISTRY MAY/JUNE 2010 (SSCE WAEC MAY/JUNE 2010 CHEMISTRY)

1. The electron configuration of carbon atom in its excited state is

A.  1s2 2s2 2px1 2py1

B. 1s2 2s2 2px1 2py0

C. 1s1 2s2 2px1 2py1 2pz1

D. 1s1 2s1 2px1 2py1 2pz1

 

2. An important medical use of nuclear radiation is

A. activation analysis

B carbon dating

C. radiotherapy

D. tissue regeneration

 

3. Which of the following element exhibit the same chemical properties as the atom $_{17}^{35}X$ ? An element with

A. atomic number 17

B. atomic number 18

C. mass number 35

.D. mass number 52

 

4. Which of the following noble gases has electronic structure similar to that of N in NH3 $[_{7}^{14}N]$

A. 2He

B. 10Ne

C. 18Ar

D. 36Kr

 

5. Which of the following equation represents beta decay?

A. $_{92}^{238}U\to _{90}^{234}Th+_{2}^{4}He$

B. $_{7}^{14}N+_{2}^{4}He\to _{8}^{17}O+_{1}^{1}H$

C. $_{92}^{239}U\to _{93}^{239}Np+_{-1}^{0}e$

D. $_{7}^{13}N+_{2}^{4}He\to _{8}^{16}O+_{1}^{1}H$

 

6. The energy change which accompanies the addition of an electron to a gaseous atom is

A. atomization

B. electron affinity

C. electro-negativity

D. Ionization

 

7. Which of the following elements is a d-block elements?

A. Calcium

B. Iron

C.  Lithium

D. Silicon

 

8. Calcium and magnesium belong to the same in the periodic table because of

A. are metals

B. form cations

C. form colourless salts

D. have the same number of valence electrons

 

9. Which of the following elements is diatomic?

A. Iron

B. Neon

C. Oxygen

D. Sodium

 

10. Which of the following statement about chlorine and iodine at room temperature is correct?                                                                               

A. Chlorine is gas and iodine is solid

B Chlorine is liquid and iodine is gas

C. Chlorine and iodine are gases

D. Chlorine is solid and iodine is liquid

 

11. If X is a group III element, its oxide would represented as

A. X3O2

B.X3O

C. X2O3

D. XO3

 

12. Which of the following species correctly represents an ion of M with 13 protons and 10 electrons?

A. 10M3+

B. 10M3–

C.  13M3+

D. 13M3–

 

13. A solid substance with high melting and boiling points is likely to be a/an

A. Covalent compound

B. dative covalent compound

C. electrovalent compound

D. non-metal

 

14. Which of the following molecules has a linear shape

A. CH4

B. CO2

C. H2S

D.NH3

 

15. Which type of bond is represented by dotted lines in the following structure?

 

 

 

A. Covalent bond

B. Dative bond

C. Electrovalent bond

D. Hydrogen bond

 

16. Which of the following molecules has a triple bond in structure?

A. CH4

B. NH3

C. N2

D. O2

 

17. The bonds in crystalline ammonium chloride are

A. covalent and dative

B. ionic and covalent

C. ionic, covalent and dative

D. ionic, covalent and hydrogen bond

 

18. Consider the neutralization reaction represented by the following equation:

$N{{a}_{2}}C{{O}_{3}}+2HN{{O}_{3}}\to 2NaN{{O}_{3}}+{{H}_{2}})+C{{O}_{2}}$

The stoichiometric ratio of acid to base is

A. 2:2

B. 2:1

C. 1:2

D. 1:1

 

19.A solution of sodium trioxocarbonate(IV) contains 10.6g in 250cm3 of solution. Calculate the concentration of the solution [Na2CO3 =106.0]

A. 0.4 mol dm–3

B. 1.0 mol dm–3

C.10.6 mol dm–3

D.25.0 mol dm–3

 

20. What is the volume occupied by 2 moles of ammonia at s.t.p?

A. 44.8dm–3

B. 22.4 dm–3

C.11.2 dm–3

D.5.6 dm–3

 

21Which of the following apparatus can bus used to measured accurately a specific volume of a liquid

A. Beaker

B Conical flask

C. Measuring flask

D. Pipette

 

22. Which of the following gases can be controlled by the set-up illustrated below?

 

 

A. H2

B. HCl

C. NH3

D.N2

 

23. A given volume of oxygen diffused through a porous partition in 8 seconds. How long would it take the same volume of carbon(IV) oxide to diffuse under the same condition? [C = 12.0,  O = 16.0]

A. 5.8 seconds

B. 6.8 seconds

C. 9.4 seconds

D. 11.0 seconds

 

24. Which of the following gases contain the highest number of atom at s.t.p?

A. 6 moles of neon

B. 3 moles of oxygen

C. 2 moles of chlorine

D. 1 moles of ethane

 

25. Given that r is the rate and p is density, the expression $r\propto \frac{1}{\sqrt{p}}$ represents

A. Boyle’s law

B. Charles’s law

C. Dalton’s law

D. Graham’s law

 

26.The determination of heat of combustion is carried out with

A. A thermometer

B. A bomb calorimeter

C. an evaporating dish

D. a boiling tube

 

27. The minimum  amount of energy required for effective collision between reacting particles is known as

A. activation energy

B bond energy

C. kinetic energy

D. Potential energy

 

28. Which of the following oxides is basic?

A. NO2

B. Al2O3

C. SO2

D. CaO

 

29. Which of the following equimolar solution would have highest conductivity?

A. NH4NO3(aq)

B.NaNO3

C. Mg(NO3)2(aq)

D.Al(NO3)3(aq)

 

30. The following substances are normal salts except

A.  Al(NO3)3

B. FeSO4

C. Mg(OH)NO3

D. NaCl

 

31. Which of the following is insoluble in water?

A. AgCl

B. KCl

C. NH4Cl

D. ZnCl

 

32. Which of the following factors would not affect the solubility of a gas?

A. Concentration

B. Nature of the solvent

C. Pressure

D. Temperature

 

33. Consider the equilibrium reaction represented by the following equation:

$2S{{O}_{2(g)}}+{{O}_{2(g)}}\rightleftharpoons 2S{{O}_{3(g)}};\text{    }\Delta H=385.7KJmo{{l}^{-1}}$

Which of the following statement about the equilibrium system is correct?

A. Addition of catalyst changes the equilibrium position

B. Decrease in pressure increases the yield of SO3

C. Decrease in pressure increase the equilibrium concentration of O2

D. Increase in temperature favours forward reaction

 

34. The rate of chemical reaction of solids are not affected by

A. catalyst

B. pressure

C. particle size

D. temperature

 

35. Which of the following statement about the cell notation $Mg/M{{g}^{2+}}//C{{u}^{2+}}/Cu$ is correct

A. copper is the anode

B. Magnesium is reduced

C. Magnesium is the anode

C. The double line represents the electrodes

 

36. Which of the following statement  about the electrolysis of CuSO4(aq) using copper cathode and platinum anode is not correct?

A. Copper is deposited at the cathode

B. Oxygen is liberated at the anode

C. It is used for the purification of copper

D. The solution becomes acidic

 

37. What is the change in oxidation number of manganese in the reaction represented by the following equation?

$MnO_{4(aq)}^{-}+8H_{(aq)}^{+}+5{{e}^{-}}\to Mn_{(aq)}^{2+}+4{{H}_{2}}{{O}_{(l)}}$

A. +3 to +2

B. +4 to +2

C. +5 to +2

D. +7 to +2

 

38. The quantity of electricity required to discharge 1mole of univalent ion is

A. 9,600C

B.48,250

C.96,500C

D. 193,000C

 

39. Fats and oils are used as raw materials in the following industry except

A. paint industry

B. plastic industry

C. margarine industry

D. cosmetics industry

 

40. Which of the following substances is trihydric?

A. Ethanol

B. Glycol

C. Glycerol

D. Phenol

 

41. An advantage of detergents over soap is that detergent

A. are readily available

B. are in powered form

C. are non-biodegradable

D. lather readily with water

 

42. The product of fermentation of sugar are

A. carbon(IV)oxide and water

B. ethanol and carbon(IV)oxide

C. ethanol and water

D ethanol and enzymes

 

43. The IUPAC name of C2H5COOC2H5 is

A. ethylethanoate

B. ethylpropanoate

C. propylethanoate

D. Prophylproponate

 

44.  An organic compound contains 40.0% carbon, 6.7 hydrogen and 53.3% oxygen. What is the empirical formula of the compound? [O =16.0, C =12.0, H=1.0]

A.C2HO

B. CHO

C. CH2O

D. CHO2

 

45. Consider the reaction represented by the following equation \[H-C\equiv C-H\xrightarrow{{{H}_{2}}}X\xrightarrow{{{H}_{2}}}Y;\]

X and Y respectively are

A. Ethene and Ethane

B. Ethane and Ethene

C. Ethyne and ethene

D. Ethene and propene

 

46. Compound N reacts with sodium metal to produce a gas that gives a ‘pop’ sound ith burning splint. N also react with ethanoic acid to give a sweet smelling liquid. Compound N is an

A. Alkanol

B. Alkanoate

C. Alkane

D.Alkanoic Acid

 

47. Which of the following structure represents that of ethylethanoate?

 

 

 

 

48.The main function of limestone I the blast furnace is to

A. act as reducing agent

B. act as catalyst

C. remove impurities

D. supply carbon(IV) oxide

 

49. Which of the following substance cannot be classified as a heavy chemical?

A. AgNO3

B  CaO

C.  CaOCl2

D.H2SO4

 

50. Which of the following metal exists as liquid at ordinary temperature?

A. Copper

B. Gold

C. Mercury

D.

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