2. The primary component of natural gas is

A. Butane
B. Ethane
C. Methane
D. Propane

3. Thermal cracking of alkanes usually

A. Involves decomposition
B. Is an exothermic process
C. Produces only small alkanes
D. Requires hydrogen

4. Carbon is deposited in exhaust pipes of cars because of

A. Contamination of petrol with diesel
B. Presence of carbon in petrol
C. Presence of additives in petrol
D. Incomplete combustion of petrol

5. How many moles of copper would be deposited by passing 1 Faraday of electricity through a CuCl₂, solution?

A. 2
B. 1
C. 0.5
D. 0.25

6. Alkenes can be manufactured by

A. Addiction of hydrogen to unsaturated vegetable oils
B. The cracking of hydrocarbons
C. Polymerization reactions
D. Combustion of alkanes

7. Petrochemistry is an example of

A. pure chemistry
B. Applied chemistry
C. Biochemistry
D. Environmental chemistry

8. Species that occur in a reaction pathway but not in the overall reaction are known as

A. Products
B. nhibitors
C. eactants
D. ntermediates

9. Which of the following statement is correct?

A. An alkane with 49 carbon atoms contain 100 hydrogen atoms
B. ddition reaction occur between alkanes and chlorine
C. utane has a lower boiling point of than propane
D. entane has five isomers

10. The best indicators to use for the titration of ethanoic acid with sodium hydroxide is

A. Methyl red
B. methyl orange
C. Butane has a lower boiling point of than propane
D. Screened methyl orange

11. The reduction half equation of the following lowly reaction is:

Zn_(s)+CuSO_4(aq)⟶ZnSO_4(aq)+Cu_(S)

A CuSO4_(s) + H2O_(l)⟶C²⁺_(aq) + SO^2-_(aq)
B Cu²⁺_(aq) + 2e^-⟶Cu_(s)
C Cu²⁺_(aq) + e^-⟶Cu_(s)
D Zn_(s)⟶Zn²⁺_(aq)+2e^-

12 If 100cm³ of a saturated solution of sodium tetraoxosulphate (VI) at 30℃ contains 10.5g of the salt, what would be its solubility at this temperature? [Na₂SO₄ = 142].

A. 0.57moldm_-3
B. 0.60moldm_-3
C. 0.74moldm_-3
D. 2.15moldm_-3

13. An example of a crystalline substance that does not possess water of crystallization is

A. Potassium trioxonitrate (V)
B. Sodium trioxocarbonate (IV)
C. Iron (II) tetraoxosulohate (VI)
D. Sodium tetraoxosulphate (VI)

14. The salt solution formed from a reaction between ethanoic acid and sodium hydroxide solution would be

A. Basic
B. Acidic
C. Neutral
D. Amphoteric

15. Which of the following reaction represents the hydrolysis of an alkanoate?

A. CH₃COOH + C₂H₅OH ⇆ CH₃COOC₂H₅ + H₂O
B. CH₃COOC₂H₅ + H₂O ⇆ CH₃COO^- + CH₃CH₂OH
C. CH₃COOCH₂CH₃CH₃ + H₂O CH₃COOH + CH₃CH₂OH
D. CH₃COOH + OH^- ⇆ CH₃COO^- + H₂O

16. Which of the following statement about the collision theory is correct?

A. All collisions brings about reactions
B. Rate of reaction is proportional to the number of effective collisions
C. Collisions of molecules will the split the molecules to react
D. Ineffective collisions brings about chemical reaction

17. Why are H₂SO₄ and CaCl₂ not suitable for drying ammonia gas?

A. Are corrosive
B. Are poisonous
C. Reacts with the gas
D. Pollute the gas

18. Which of the following equations does not illustrate correctly one of the reactions of chlorine?

A. H₂S+Cl₂⟶2HCL+S
B. Cl₂+2NaOH⟶NaCl+NaClO+H₂O
C. Cl₂+2NaF⟶2NaCl+F₂
D. Ca(OH)₂+Cl₂⟶CaOCl₂+H₂O

19. How many unpaired electrons are present in ₂₆Fe₃₊

A. 2
B. 3
C. 4
D. 5

20. Going down group two in the periodic table normally

A. Shielding effect decreases
B. Melting point
C. Ionization energy increases
D. Electronegativity increases

21. Which of the following elements has its valance electrons in the s-orbitals?

A. Sodium
B. Carbon
C. Phosphorus
D. Aluminium

22. The periodic property that is used to determine whether a covalent molecules is polar or not is

A. Atomic radius
B. Electron affinity
C. Electronegativity
D. Ionization energy

23. The following steps are scientific methods except

A. Analysis
B. Open mindedness
C. Experimentation
D. Problem identification

24. Isoelectronic species have the same number of

A. Electrons
B. Neutrons
C. Protons
D. Ions

25 An element X, has two isotopes, ₃₀⁶⁵Xand₃₀⁶⁶X with relative abundance of 60% and 40% respectively. The relative atomic mass of X is

A. 65.00
B. 65.40
C. 65.50
D. 66.00

26. The pair of compass that belongs to the same homologous series is

A. C_3H8 and C₃H₆
B. C_4H10 and C₅H₁₀
C. C_2H4 and C₄H₁₀
D. C_2H6 and C₄H₁₀

27. A consequence of global warming is

A. Flooding
B. Water pollution
C. Air pollution
D. High humidity

28 Which of the following gases has the lowest state of diffusion [H=1.0 C=12.0 N=14.0 O=16.0]

A. Nitrogen
B. Ammonia
C. Oxygen
D. Methane

29. The gas that is less dense than air is

A. Carbon (IV) oxide
B. Nitrogen
C. Chlorine
D. Oxygen

30. Which of the following equimolar solution has the highest conductivity?

A H₂CO_3(aq)
B. H₂SO_{4(aq)
C. NaOH(aq)
D. CH3COONa(aq)}

31. What takes place at the cathode during electrolysis

A. Anions lose electrons
B. Anions are oxidized
C. Cations are discharged
D. Cations are oxidized

32 How many grams of NaOH_(s) would be needed to produce 100.0cm³ of a 0.2moldm^-3 NaOH(aq)? [Na=40.0]

A. 0.02g
B. 0.80g
C. 20.0g
D. 800.0g

33. The formation of a bond between hydrogen and a highly electronegative atom results in

A. Polarity
B. Dipole
C. Metallic bond
D. Electrovalent bond

34. The molecules that has a non-polar covalent bond is

A. H₂O
B. HCL
C. NH₃
D. Cl₂

35. Which of the element in the table below would react more readily with chlorine?

Element	Ionization energy (kJ mol-1×10-3)
W	12.0
X	21.0
Y	106.0
Z	200.0

A. W and X only
B. W and Z only
C. X and Y only V
D. Y and Z only

36. The relative molar mass of a gaseous hydrocarbon is 30. Determine its vapour density

A. 15
B. 30
C. 60
D. 45

37. Consider the following equation:
2S0_3(g)⟶2SO_2(g) + O_2(g);∆H = + 198kJ mol^-1

Which of the following statement about the reaction is correct A. The reaction is exothermic
B. The reaction container would feel warm
C. 198kJ of energy is given off
D. 198kJ of energy is absorbed

38. Which of the following properties does not give evidence of the kinetic theory of matter?

A. Evaporation
B. Diffusion
C. Polymerization
D. Melting

39. A compound that could be dried by using conc. Tetraoxosulphate (VI) acid and not by calcium oxide is likely to be

A. An alkaline gas
B. A neutral gas
C. A deliquescence gas
D. An acid anhydride

40. Positive ions in the sea of electrons are found in

A. Covalent bonds
B. Dative bonds
C. Ionic bond
D. Metallic bonds

41. Dilute trioxonitrate (V) acid does not produce hydrogen when it reacts with metals because

A. It is a strong oxidizing agent
B. It reacts with the products
C. There is no visible reaction
D. It is highly corrosive

42 How many moles are there in 3.0g of O₃? [O = 16.0]

A. 0.0093
B. 0.0930
C. 0.6250
D. 0.0625

43. Copper (II) ions are able to participate in coordinate covalent bonding because they

A. Are colored
B. Have unpaired electron
C. Have vacant d-orbitals
D. Are positively charged

44. Determine the volume of 0.100mol of HCL in 0.250moldm^{-3 of solution}

A. 20cm³
B. 100cm³
C. 200cm³
D. 400cm³

45. Which of the statement about gases is not correct?

A. The total kinetic energy of the gas is not affected by collision
B. Molecules of the gas are in constant motions
C. Gases have low density compared to solid and and liquid of equal mass
D. Gas are highly soluble in water at high temperatures

46. Arrange the following compound in decreasing order of boiling point NH₃,HF,SiH₄,CH₄.

A. NH₃,CH₄,SiH₄,HF
B. CH₄,SiH₄,NH₃,HF
C. HF,NH₃,SiH₄,CH₄
D. CH₄,SiH₄,HF,NH₃

47. The following statement are correct except

A. Energy is released when liquid changed to solids
B. Particles move faster in the gaseous state than in the liquid state
C. Carbon atoms in gaseous methane are further apart than those in solid diamond
D. There is large decrease in the volume of a solid metal when pressure is applied to it

48. The vapour density of an organic compound with molecular formula C₂H₄O₂ is[H=1.0 C=12.0 O=16.0]

A. 120
B. 65
C. 40
D. 30

49. A mixture containing two salt of different solubility can be separated by

A. Chromatography
B. Distillation
C. Crystallization
D. Evaporation

50. The separation techniques that is suitable for separating iodine from tetrachloromethane is

A. Solvent extraction
B. Fractional distillation
C. Decantation
D. Filtration