WASSCE CHEMISTRY MAY/JUNE 2009 (SSCE WAEC MAY/JUNE 2009 CHEMISTRY)
1. Which of the following scientists discovered the neutron?
A. Ernest Rutherford
B. J.J Thompson
C. James Chadwick
D.R.A Milliakan
2. How many protons does $_{20}^{40}Ca$ contain?
A. 20
B.30
C. 40
D. 60
3. If 100 atoms of elements X contain 70 atoms of 9X and 30 atoms of 11X1. Calculate the relative atoms mass of X1
A. 9.6
B. 10.6
C. 11.6
D. 20.0
4. Consider the reaction represented by the equation $_{92}^{238}U+_{0}^{1}n\to _{58}^{138}Ba+_{36}^{94}Kr+3_{0}^{1}n$
The reaction represent a
A. nuclear fission
B. nuclear fusion
C. radioactive decay
D. spontaneous disintegration
5. How many orbital are associated with the p – sub energy level?
A. 2
B. 3
C. 5
D. 6
6. Which of the following element has the electronic configuration of 1s2 2s2 2p6 3s2 3p1
[11Na, 13Al, 14N, S]
A. Al
B. Na
C N
D. S
7. The following properties are characteristics of transition elements except
A. formation of complex ions
B. fixed oxidation states
C. formation of coloured compounds
D. catalytic abilities
8. Which of the following ions is isoelectric with neon [3Li, 9F, 10Ne, 17Cl, 19K]
A. Cl–
B. F–
C. K+
D. Li+
9. Which of the following electronic configuration correctly represents an elements in period 3 of the table?
A. 1s2, 2s2, 2p2
B. 1s2, 2s2, 2p6
C. 1s2, 2s2, 2p6 3s2 3p4
D.1s2 2s2 2p63s2 3p6 4s1
10. A element Q forms a compound QCl5. In which group of the periodic table is Q
A. I
B. III
C. V
D. VII
11. Which of the following statement about the behaviour of the atom is correct?
A. Atomic size deceases down the group
B. Atomic size increases across the period
C. Anions are smaller than the parent atom
D. Cations are smaller than the parents atom
12. Which of the following arrangement is in order of increasing ionization energy?
A. Al, Si, P, S
B. Si, Al, S, P
C. C,S, P, Si, Al
D.P, Si, S, Al
13. Which of the following properties of covalent compound is not correct? They
A are non – electrolytes
B. are most gaseous and volatile liquids
C. have low melting points
D. have high boiling points
14.Which of the following molecules is not linear in shape
A. CO2
B. O2
C. NH3
D. HCl
15. In bonded atoms, increase in electro-negativity difference
A. Increase polarity
B decease polarity
C. has no effect on polarity
D. bring the polarity to zero
16. The number of particles in one mole of a chemical compound is the
A. Atomic number
B. Avogadro’s number
C. mass number
D. oxidation number
17. How many molecules are there in14g of nitrogen at s.t.p?
[N=14, Avogadro constant = 6.02×10–23mol–1]
A. 6.02×1023
B.3.01×1023
C.8.43×1024
D. 1.20×1024
18. Consider the reaction represented by the equation: $2NaHC{{O}_{3}}\to N{{a}_{2}}C{{O}_{3}}+{{H}_{2}}O+C{{O}_{2}}$
What is the mass of sodium trioxocarbonate(IV) produced by the complete decomposition of 33.6g of sodium hydrogen trioxocarbonate(IV)? [NaHCO3 = 84, Na2CO3 = 106]
A. 10.6g
B. 16.8g
C. 21.2g
D. 42.4g
19. What is the percentage by weight of calcium in Ca(OCl)2?
[Ca = 40, Cl =35.5, O = 16]
A. 28.0%
B.31.6%
C.43.8%
D. 44.5%
20. Which of the following gases is lighter than air?
A. HCl
B. CO2
C.SO2
D. NH3
21.What is the value of –14oC on the Kelvi temperature scale?
A. 259K
B. 259oK
C. 287K
D.287oK
22. Which of the following expressions correctly represents Charles’ law
A. PV = K
B. $R\propto \frac{1}{\sqrt{p}}$
C.PV =RT
D.V = KT
24. Consider the changes in state of matter as represented in the sketch
Stage X represent the process of
A. boiling
B. condensation
C. melting
D. Sublimation
25. In a chemical reaction, ΔH is positive when
A. H(product) > H(reactant)
B. H(product) < H(reactant)
C. H(product) = H(reactant)
D. H(product) = 0
26. Consider the reaction represented by the following equation:
${{H}_{2(g)}}+\tfrac{1}{2}{{O}_{2(g)}}\to {{H}_{2}}{{O}_{(g)}}\text{ }\Delta H=-285.8KJmo{{l}^{-1}}$ ΔH represents the enthalpy of
A. formation
B. hydration
C. neutralization
D. Solution
27. Salts that contains water of crystallization are said to be
A. anhydrous
B. deliquescent
C. efflorescent
D. hydrated
28. Which of the following dilute acids does not react with metal to liberate hydrogen?
A. CH3COOH(aq)
B. HCl(aq)
C. H2SO4(aq)
D. HNO3(aq)
29.. Which of the following compounds is not a double salts
A. Zn(OH)NO3
B. KAl(SO4)2
C. KCr(SO4)2
D.(NH4)2Fe(SO4)2
30. Which of the following hydroxides will readily in water
A. Cu(OH)2
B. NaOH
C.Pb(OH)2
D.Zn(OH)2
31. Which of the following acids forms normal salt only?
A. Tetraoxosulphate(VI) acid
B. Tetraoxophosphate(V) acid
C.Trioxonitrate(V) acid
D. Trioxosulphate(IV) acid
32. A solution that contains as much solute as it can dissolve at a given temperature is said to be
A. concentrated
B. saturated
C. superheated
D. unsaturated
33. Which of the following salts is insoluble in water?
A. Pb(NO3)2
B.Na2CO3
C. AgNO3
D.AgCl
34. Which of the following statements is correct? The solubility of
A. gases increase with increase in temperature.
B. gases decrease with increase in temperature
C. most solid solutes decrease with increase in temperature
D. most solid solutes is constant
35. A catalyst increase the rate of chemical reaction by
A. decreasing the temperature of the reaction
B. decreasing the activation energy of the reaction
C. Increase the surface area of the reactants
D. decreasing the surface area of the products
36. Which of the following factors will affect the rate of the reaction represented by the equation? $2HC{{l}_{(aq)}}+CaC{{O}_{3(s)}}\to CaC{{l}_{2(aq)}}+{{H}_{2}}{{O}_{(l)}}+C{{O}_{2(g)}}$
I. Pressure
II. Concentration
III. Nature of reactants
IV. Temperature
A. I and II only
B. II, III and IV only
C. I, II and III only
D. I, II, III and IV
37. Which of the following substances is the anode in the dry Leclanché cell?
A. Carbon rod
B. Muslin bag
C. The seal
D. Zinc container
38. Consider the reaction represented by the equation: $2{{H}_{2}}S{{O}_{4(aq)}}+{{C}_{(s)}}\to 2{{H}_{2}}{{O}_{(l)}}+2S{{O}_{2(g)}}+C{{O}_{2(g)}}$
H2SO4 is acting as
A. a catalyst
B. an oxidizing agent
C. a reducing agent
D. a sulphonating agent
39. Which of the following oxides has oxidation number +1
A. KNO3
B.N2O
C. N2O3
D. NO
40. The separation of petroleum fractions depends on the differences in their
A. boiling points
B. molar masses
C. melting points
D. solubilities
41. Which of the following raw materials is used in the plastic industry?
A. Calcium
B. Ethene
C. Hydrogen
D. Methane
42. The product of the reaction between C2H5OH and concentrated H2SO4 at 170oC is
A. (C2H5)2SO4
B. CH3CH2HSO4
C. (C2H5)2O
D. CH2=CH2
43. When protein is heated to a high temperature it undergoes
A. Condensation
B. denaturation
C. hydrolysis
D. polymerization
44. What is the molecular formula of a compound with empirical formula CH2O and vapour density of 90 [H = 1, C = 12, O =16]
A. C4H8O2
B. C4H8O3
C. C6H10C5
D. C6H12O6
45. What is the product of the reaction between propene and 1 mole of hydrogen iodide?
A. CH3CHICH3
B. CH3CH2CHI2
C. CH3CH2CI3
D.CH3CHICH2I
46. Ethanol reacts with excess acidified K2Cr2O7 to produce
A. ethanal
B. ethane
C. ethanoic acid
D. ethylethanoate
47. Dry hydrogen chloride when dissolved in methylbenzene
A. turn blue litmus paper red
B. turns red litmus paper blue
C. does not affect litmus paper
D. bleaches litmus paper
48. The consequence of global warming is
A. air pollution
B flooding
C. increase humility
D. low rainfall
49. The major product in the solvay process is
A. NaOH
B. Na2CO3
C. NH3
D. H2SO4
50. Which of the following alloys does not contain copper? I Brass II. Bronze III. Steel
A. I only
B. II only
C. III only
D. II and III only