Your results on Chemistry 2013 are shown below

:

1. Which of the following instruments is used in detecting the presence of radiation?

• Cathode ray tube
• Geiger-Muller counter
• Mass spectrometer
• X-ray tube

2. The molecule which has a linear shape is

• CH4
• NH3
• H2S
• CO2

3. The formula of the compound formed between a trivalent metal, M and a divalent non metal, Y is

• M2Y2
• M3Y2
• MY
• M3Y

4. An atom of an element X gains two electrons. The symbol of the ion formed is

• X+
• X2+
• X2-
• X-

5. Which of the following statements is correct?

• Atomic size decreases down the group
• Atomic size increases across the period
• Anions are smaller than the parent atom
• Cations are smaller than the parent atom

6. Which of the following arrangements represents the correct order of electronic energy level?

• 2p 2s 3p 3s 3d 4s
• 2s 2p 3s 3p 3d 4s
• 2s 2p 3s 3p 4s 3d
• 2s 3s 2p 3p 4s 3d

7. The element with electron configuration 1s2 2s2 2p6 3s2 3p1 belongs to

• s-block, period 3, group 1
• p-block, period 3, group 2
• s-block, period 3, group 3
• p-block, period 3, group 3

8. In the periodic table, all the elements within the same group have the same

9. Which of the following halogens is liquid at room temperature?

• Iodine
• Chlorine
• Bromine
• Fluorine

10. Rare gases are stable because they

• Chemically active
• Contain equal number of protons and neutrons
• Contain more electrons than protons
• Have octet structures

11. In the periodic table, alkaline earth metals can be found in group

• I
• II
• VI
• VII

12. In which of the following series are atoms arranged in order of increasing ionization energy?

• Li, Na, K
• B, Be, Li
• Have octet structures
• Be, Mg, Ca

13. Which of the following types is responsible for high boiling point of water?

• Metallic bond
• Covalent bond
• Ionic bond
• Hydrogen bond

14. In metallic solid, the forces of attraction is between the mobile valence electrons and the

• Atoms
• Neutrons
• Negative ions
• Positively charged nuclei

15. The bonds is crystalline ammonium chloride are

• Covalent and dative
• Ionic and covalent
• Ionic, covalent and dative
• Ionic, covalent and hydrogen bond

16. Which of the following elements is diatomic?

• Sodium
• Oxygen
• Iron
• Neon

17. Noble gas molecules are held together by

• Van der Waals forces
• Hydrogen bonds
• Dative bonds
• Covalent bonds

18. Which of the following statement about nuclear reaction is correct? The reaction

• InvolvesNneutron only
• Takes place inside the nucleus
• Is governed by temperature and pressure
• Involves protons and electrons only

19. Consider the reaction represented by the following equation C2H2+ yH2 C2H6. The value of y in the reaction is

• 4
• 3
• 2
• 1

20. The volume of 0.25 moldm3 solution of K0H that would yield 6.5grams of solid K0H on evaporation is (K=39.0; O=16.0; H=1.00)

• 464.30cm3
• 625.00cm3
• 1000.00cm3
• 2153.80cm3

21. The percentage by mass of calcium Ca(OCL)2 Ca = 40.0; Cl = 35.5; O = 16.0

• 28.0%
• 31.6%
• 443.8%
• 44.5%

22. The gas law which describes the relationship between volume and temperature is .

• Boyle’s law
• Charles’ law
• Dalton’s law
• Graham’s law

23. Which of the following phenomena leads to decrease volume of a liquid in an open container?

• Brownian motion
• Diffusion
• Evaporation
• Sublimation

24. The pressure exerted by a gas is a function of the

• Total volume of the gas
• Speed of the gaseous molecules
• Mass of each gaseous molecule
• Frequency of collision between gaseous molecules

25. Which of the following gases are arranged in increasing order of diffusion rate? H= 1.0; C=12; N = 14.0; O = 16; S = 32

• SO2, O2, NH3, H2
• H2S, NH2, O2, SO2
• CO2, N2O, O2, SO2
• NH3, NO2, N2, CO2

26. Which of the following variables is a measure of the average kinetic of the molecule of a gas?26. Which of the following variables is a measure of the average kinetic of the molecule of a gas?27. When heat is absorbed during chemical reaction the reaction is aid to be

27. When heat is absorbed during chemical reaction the reaction is aid to be

• Adiabatic
• Endothermic
• Exothermic
• Isothermal

28. The aqueous solution which has pH > 7 is

• FeCL3(aq)
• CuSO4(aq)
• KNO3 (aq)
• Na2CO3(aq)

29. Which of the following acids would readily react with CaCO3 to liberate CO2?

• CH3COOH
• H2SO4
• H2SO3
• HNO3

30. Which of the following compounds crystallizes without water of crystallization?

• MgSO4
• Na2CO3
• NaCl
• FeSO4

31. A substance is said to be impure if

• its melting point range is wide
• it dissolves in water with difficulty
• it has a low melting point
• it is coloured

32. The following factors affect the solubility of a solid in a given solvent except

• Nature of solute
• Nature of solvent
• Pressure
• Temperature

33. Consider the reaction represented by the equation N2O4(g) 2NO2(aq) ; ∆ = + x K Jmol-1.what happen when the temperature is reduced at equilibrium?

• Concentration of N2O 4 (g)decreases
• Concentration of N2O4(g) increases
• Pressure exerted by the gases increases
• pressure exerted by the gases remains constant

34. Which of the following cells produce electrical energy from chemical reactions?I Lead – acid battery II dry cell III Daniel cell IV Electrolytic cell

• I and II
• I,II and III
• II,III and IV
• I,III and IV only

35. What happens at the cathode during electrolysis?

• Anion is oxidized
• Anion loses electrons
• Cation is oxidized
• Cation is discharge

36. Which of the following substance are electrolytes? I PbBr₂₍ᵢ₎ II NaCL₍aq₎ III NaCl(s) IV C6H12O6(aq)

• I and II only
• I,II and IV
• II, III and IV only
• I, III, and IV only

37. Consider the redox reaction as represented by the following equation: I2 (aq) + 2S2O32- (aq) 2I-(aq) + S4O62-(aq) which of the species is reduced?

• S4O62- (aq)
• S4O32- (aq)
• I2 (aq)
• I2-(aq)

38. The separation of petroleum fraction depends on the differences in their

• Melting point
• Molar masses
• solubilities
• Boiling points

39. 39. The major point formed by the reaction between ethanoic acid and aqueous sodium hydroxide is

• Soap
• Sodium ethanoate
• Sodium methoxide
• Water

40. Which of the following organic compounds would decolourise bromine water?

• Benzene
• Cyclobutane
• Hexane
• Penane

41. 41. How many isomers are in C3H6Cl2?

• 2
• 3
• 4
• 5

42. A colourless hydrocarbon with a sweet smell undergoes substitution reaction. The hydrocarbon is likely to be

• alkanol
• benzene
• ester
• methane

43. Which of the follwoing reactions is common to all hydrocarbons

• combustion
• addition
• polymerization
• condensation

44. A hydrocarbon compound contains 92.3% carbon. Determine its empirical formular
[H:1, C:12]

• CH
• CH2
• CH3
• C2H3

45. The main function of limestone in a blast furnace is to

• act as catalyst
• act as reducing agent
• remove impurity
• supply carbon(iv)oxide

46. Which of the following raw materials is used in plastic industry?

• ethene
• methane
• calcium
• hydrogen

47. Which of the following statements about thermoplastic material is correct? They

• do not melt on heating
• harden on heating
• decompose on heating
• soften and melt on heating

48. Bronze is a mixture of

• Cu and Mg
• Cu and Sn
• Cu and Zn
• Cu and Pb

49. WHich of the following statements about fine chemical is correct?

• It is injurious to the health
• has low degree of purity
• is produced in relatively small amount
• can be stored for a long time

50. Which of the following materials is classified as a non-biodegradable pollutant?

• Animal hide
• Paper
• Plastic
• Wood

ANSWERS

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