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CHEMISTRY (Objective Questions And Answers)


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THEORY QUESTIONS
WAEC SYLLABUS

WASSCE 2009

Objectives



1. Which of the following scientists discovered the neutron?

A. Ernest Rutherford

B. J.J Thompson

C. James Chadwick

D. R.A. Millikan


2. How many protons does 4020Ca contain?

A. 20

B. 30

C. 40

D. 60


3. If 100 atoms of element X contains 70 atoms of 9X and 30 atoms of 11X. calculate the relative atomic mass of X

A. 9.6

B.10.6

C.11.6

D.20.0


4. Consider the reaction represented by the equation: 238/92 U + 1/0n ---> 139/56 Ba + 94/36Kr + 3 1/0 n. The reaction represents a

A. nuclear fission

B. nuclear fusion

C. radioactive decay

D. spontaneous disintegration


5. How many orbitals are associated with the p-sub energy level?

A. 2

B.3

C.5

D.6


ANSWERS

6. Which of the following elements has the electronic configuration: Is2 2s2 2p6 3s2 3p1? [11Na, 13A1, l4N, I6S]

A. A1

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 isoelectronic with neon? [3Li, 9F, 10Ne, 17C1, 19K]

A. CI-

B. F-

C. K+

D. Li+


9. Which of the following electronic configurations correctly represents an element in period 3 of the periodic table?

A. ls2 2s2 2p3

B. ls22s22p6

C. Is2 2s2 2p5 3s2 3p*

D. Is2 2s22p" 3s2 3p64s'


10. An element Q forms a compound QCI5. In which group of the periodic table is Q?

A. I

B. IIl

C. V

D. VII


ANSWERS

11. Which of the following statements about the behavior of the atom is correct?

A. Atomic size decreases down the group

B. Atomic size increases across the period

C. Anions are smaller than the parent atom

D. Cations are smaller than parent atom


12. Which of the following arrangements is in order of increasing ionization energy?

A. AI,Si,P,S

B. Si,Al,S,P

C. S,P,Si,AI

D. P,Si,S,AI


13. Which of the following properties of covalent compounds is not correct? They

A. are non-electrolytes

B. are mostly 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.HCI


15. In bonded atoms, increase in electronegativity difference,

A. increases polarity

B. decreases polarity

C. has no effect on polarity

D. brings the polarity to zero


ANSWERS

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 in 14 g of nitrogen at s.t.p? [N = 14, Avogadro's c 6.02 x 1023 mol'1]

A. 6.02 x 1023

B.3.01 x 1023

C. 8.43 x 1024

D.1.20X1024


18. Consider the reaction represented by the equation: 2NaHC03 -----> Na2C03 + H2O + CO2 What is the mass of sodium trioxocarbonate (IV) produced by the complete decomposition of 33.6 g of sodium hydrogen trioxocarbonate (IV)? [NaHCO3 = 84, Na2C03 = 106]

A. 10.6 g

B. 16.8 g

C.21.2g

D.42.4g


19. What is the percentage by weight of calcium in Ca(OCI)2? [Ca = 40, CI = 35.5,0=16]

A.28.0%

B.31.6%

C.43.8%

D.44.5%


20. Which of the following gases is lighter than air?

A. HCI

B. CO2

C.SO:

D.NIL


ANSWERS

21. What is the value of -14°C on the Kelvin temperature scale?

A.259K

B.259°K

C.287K

D.287°K


22. Which of the following expressions correctly represents Charles' law?

A. PV = K

B. R a 1 p

C.PV = RT

D. V = P/KT


23. In a mixture of gases which do not react chemically together the pressure exerted by the individual gases is called

A. atmospheric pressure

B. partial pressure

C. total pressure

D. vapour pressure


24. Consider the change in state of matter as represent in the sketch. Stage X represents the process of





A boiling

B. condensation

C. Melting

D. sublimation


25. In a chemical reaction, EH is positive when

A. H(producl) > H (reactant)

B. H(product) < H (reactant)

C. H(product) = H (reactant)

D. H(product) = Zero


ANSWERS

26. Consider the reaction represented by the following equation H2(e) + ½ 02(G) ----> H20(g) AH = - 285.8 KJmol1 DH represents the enthalpy of

A. formation

B. hydration

C. neutralization

D, solution


27. Salts that contain 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 me to liberate hydrogen?

A. CFbCOOFEa,)

B. HCI(aq)

C. CH-SChH)

D. HN03


29. Which of the following compounds is not a double salt?

A. Zn(OH)N03

B.KAI(SO04)2

C. KCr(S04)2

D. (NH4)2Fe(SO4)2


30. Which of the following hydroxides will readily dissolve in water?

A. Cu(OH)2

B. NaOH

C. pb(OH)2

D. Zn(0H)2


ANSWERS

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 a given temperature is said to be

A. concentrated

B. saturated

C. supersaturated

D. unsaturated


33. Which of the following salts is insoluble in water?

A. Pb(N03)2

B. Na2C03

C.AgN03

D. AgCI


34. Which of the following statements is correct? The solubility

A. gases increases with increase in temperature

B. gases decreases with increase in temperature

C, most solid solutes decreases with increase in temperature

D. most solid solutes is constant


35. A catalyst increases the rate of chemical reaction by

A. decreasing the temperature of the reaction

B. decreasing the activation energy of the reaction

C. increasing the surface area of the reactants

D. decreasing the surface area of the products.


ANSWERS

36. Which of the following factors will affect the rate of the reaction represented by the equation? 2HCIr„„ + CaC03(s) -----> CaCl2(aq) + H20(1) + C02(g) I. Pressure II. Concentration III. Nature of reactants IV. Temperature

A. I and 11 only

B. II,III and IV only

C. III and III only

D. I,II, III and IV


37. Which of the following substances is the anode in the dry Leclanche cell?

A. Carbon rod

B. Muslin bag

C. The seal

D. Zinc contain


38. Consider the reaction represented by the equation:

2H2SCV4(aq) + C(s) -----> 2H2S0(1) + 2S02(g) + C02(g)

A. a catalyst

B. an oxidizing agent

C. a reducing agent

D. a sulphonating agent.


39. Which of the following oxides of nitrogen has oxidation number of + 1?

A. KN03

B. N20

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


ANSWERS

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 HS04 at 170°C is

A. (C,H,)2S04

B. CH3CH,HS04

C. (C2H5)20

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 and CH20 and vapour density of 90? [H=1,C=12,0=16]

A. C4H802

B.C4H803

C.C6H10O5

D.C6H,,06


45. What is the product of the reaction between propene and 1 mole of hydrogen iodide?

A. CH3CHICH3

B. CH3CH2CHI2

C. CH3CH2CI3

D. CH3CHICH2I


ANSWERS

46. Ethanol reacts with excess acidified K,Cr,07 to produce

A. ethanal

B. ethane

C. ethanoic acid

D. ethylethanoate


47. Dry hydrogen chloride when dissolved in methylbenzene

A. turns blue litmus paper red

B. turns red litmus paper blue

C. does not affect litmus paper

D. bleaches litmus paper


48. A consequence of global warming is

A. air pollution

B. flooding

C. increased humidity

D. low rainfall


49. The major product in the solvay process is

A. NaOH

B. Na,C03

C.NH3

D. H2S04


50. Which of the following alloys does not contain copper? I Brass: II. Bronze III. Steel

A. 1 only

B. II only

C. III only

D. II and III only



WASSCE JUNE 2009 CHEMISTRY OBJECTIVE TEST

ANSWERS

​1. C 2.A 3. A 4. A 5. B 6. A 7. B 8. B 9. C 10. C 11. D 12. A 13. D 14. C 15. A 16. B 17. B 18. C 19. A 20. D 21. A 22. 23. B 24. C 25. A 26. A 27. D 28. D 29. A 30. B 31. C 32. B 33. D 34.B 35. B 36. B 37. A 38. B. 39. B 40. A 41. B 42. D 43. B 44. D 45. A 46. C 47. 48. B 49. B 50. C


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