1. The number of orbitals in a p-sub level of an atom is A. 2 B. 3 C. 5. D. 6
2. Which of the following electron configurations repre sents that of an atom in its ground state? A.$1s^{2} 2s^2 2p^6 3s^1 3p^1$ B. $ 1s^2 2s^1 2p^1$ C.$1s^2 2s^1 2p^3$ D. $1s^{2} 2s^{2} 2p^{6} 3s^0$
3. A beam of particles was passed between charged plates as illustrated in the diagram below.
X, Y and Z are respectively A. electron, neutron and proton. B. electron, proton and neutron. C. proton, neutron and electron. D. proton, electron and neutron.
4. Which of the following ions has an electron configuration different from the others? A. $17^{Cl-}$ B. $80^{2-}$ C. $12Mg^{2+}$ D. $13Al^{3+}$.
5. The atomic radii of metals are usually A. greater than their ionic radii. B. equal to their ionic radii. C. less than their ionic radii. D. less than those of non-metals in the same period.
6. Two elements, X and Y are in the same group on the periodic table because they both have the same A. number of electronic shells. B. number of valence electrons. C. atomic size. D. atomic number.
7. The d-block elements are paramagnetic because they A. contain paired electrons which are repelled by magnetic field. B. contain unpaired electrons in the partially filled 3d-orbital. D. have delocalized valence electrons.
8. Which of the following statements about a radioactive substance is/are correct? l. It emits radiation continuously and spontaneously. ll. The emitted radiations are affected by temperature and pressure. Ill. The radiation can penetrate opaque matter. A. Il only B. I and Il only C. I and Ill only D. Il and Ill only.
9. Which of the following elements is a metalloid? A. Carbon B. Oxygen C. Silicon D. Sodium
10. Which of the following halogens is liquid at room temperature? A. Chlorine B. Fluorine C. Iodine D. Bromine
11. The shape of a graphite crystal is A. tetrahedral. B. pyramidal. C. hexagonal. D. octahedral.
12. The compound formed by the combination of two elements with a large electronegativity difference is likely
18. Consider. the reaction represented by the following equation: $xCH_{3}OH+yO_2 + 2CO_2 + zH_{2} O$. The values of x, y and z respectively, are A. 2, 3 and 4. B. 2, 4 and 3. C. 1, 2 and 3. D. and 5.
13. The complex compound formed when aluminium dissolves in aqueous sodium hydroxide is A. $Na_{2}Al(OH)_{4}$ B. $Na Al(OH)_4$ C. $Na Al(OH)_3$ D. $Na_{3}Al(OH)_3$
14. The vapour pressure of a liquid depends on l. tempera ture. ll. rate of condensation. Ill. cohesive forces holding the particles together. A. Il only B. I and Il only C. I and Ill only D. Il and Ill only
15. MgO does not readily dissolve in water because A. of its high melting point. B. it is a covalent compound. C. it forms a hydroxide when dissolved in water. D. its lattice energy is higher than its hydration energy.
16. Consider the following reaction equation: $CaCO + 2HCl_{aq} 2CaCl + H_{2}O + CO_{3}$ . What mass of $CaCl_2$ would be obtained when 25.6 percent of CaCO is reacted with excess HCl? [$CaCO_3$ = 100;$ CaCl$= 111] A. 4.00g B. 4.44g C. 18.9g D. 27.8g.
17. The number of sulphur atoms in 3.20g of $S0_{2(aq) } is [O = 16.0; S = 32.0$; Avogadro constant = $6.02 \times 10^23] $ A. $3.01 \times 10^{22}$. B. $6.02 \times 10^{22}$. C. $6.02 \times 10^{23}$. D. $1.20 \times 1024$.
20. A sample of a gas may be identified as chlorine if it
turns A. damp blue litmus paper red. B. lime water milky. C. lead ethanoate paper black. D. starch iodide paper blue-black.
21. A metal M forms two types of chlorine,$ MC1_2$ and $MCI$ . Which of the following laws best explains the relationship between the chlorides? Law of A. conservation of mass. B. definite proportion. C. multiple proportion. D. reciprocal proportion.
22. Which of the following metals would readily displace hydrogen from steam? A. Copper B. Lead C. Magnesium D. Silver
23. The volume occupied by 0.4 g of hydrogen gas at s.t.p. is [ H = 1.00; Molar volume at s t p. = $22.4 dm^3]$ A. $2.24 dm^3$. B. $4.48 dm^3$. C. $22.4 drn^3$. D. $44.8 dm^3$.
24. When a substance changes directly from the gaseous state to the solid state without forming a liquid, the substance is said to A. condense. B. evaporate. C. sublime D. precipitate
25. At ordinary temperature $H_{2}O$ is a liquid while $H_{2} S$ is a gas. This is because $H_{2}O$ has A. weak intermolecular forces holding its molecules together. B. strong hydrogen bonds holding its molecules together. C induced dipole-induced dipole forces between its molecules. D. ionic forces between its molecules.
26. The postulate that molecules are in constant random motion best explains why liquids A. can undergo solidification. B. maintain their volumes. C. are incompressible. D. have no characteristic shape.
27. Which of the following gases has the lowest rate of diffusion under the same condition? [ H = 1.00; He 4.00; O = 16.0; Cl = 35.51A. $Cl_{2}$ B.$H_2$C. He D. $O_2$
28. The energy evolved when magnesium burns in air is in the form of A. heat. B. heat and sound. C. light and heat. D. sound.
29. A substance L react with$ NH_{4}N0_{3}$ to generate ammonia gas. L is likely to be A. HCl B. NaOH. C $CH_{3}COOH$. D. $CaSO_{4}$.
30. On heating, the following trioxocarbonate (IV) salts decompose to give solid residue except A. ammonium trioxocarbonate (IV). B. calcium trioxocarbonate (IV). C. lead (Il) trioxocarbonate (IV). D. zinc trioxocarbonate (IV).
31. Which bf the following pH values indicates that a solution is a strong base? A. 1 B. 5. C. 9 D. 13
32. The hydrolysis of$ NH_{4}Cl$ gives A. an acidic solution. B. an alkaline solution. C. a buffer solution. D. a neutral solution.
33. A spot of oil paint on a shirt can best be removed using A. brine. B. detergent. C. kerosene. D. warm water.
See pages for figure
34. Which of the following deduction could be correctly made from the graph? A. The solubility of U is not affected by change in temperature. B. The solubility of S decreases with increasing temperature. C. T is
most soluble among the salts. D. S is least soluble among the salts.
35. Consider the reaction represented by the following quation:$ CuO_{s} + H_{2}SO_{4(aq)}+ 2 CuSO_{4 (aq)}+ H_{2}O_{(l)}$ which of the following factors will not affect the rate of the reaction? A. Particle size of CuO B. Concentration of $H_{2}SO_{4}(aq)$ C. Temperature of the reacting mixure D. Pressure of reaction system.
Use the following graph to answer questions 36 and 37.
36. The activation energy for the reaction is A 4kJ B. 60kJ C. 80kJ D. 120J .
37. The type of reaction represented by the graph is enthothermic. B. exothermic. C. catalytic. D, spontaneous.
38. which of the following devices function on redox
reaction? l. Dry cell II. Car battery III. Electric generator A. I and II only B. II and III only C. I and II only D. I, II and III
39. The oxidation number of Fe in $[Fe(CN)6]^{3-}$ is A. +3 B. +2 C. -2 D. -3
40. consider the following reaction equation: $C_{16}H_{34} +2 C_{5}H_{12 }+C_{11}H_{22}$ .
The process represented by the equation is A. cracking. B. fermentation. C. polymerization. D. reforming.
41. See pages for figure
42. Which of the following statements about the structure is not correct? 'They A. are geometric isomers. B. are saturated hydrocarbons. C. have similar physical properties. D. are members of the same homologous series.
42. Which of the following substances would not produce ethanol when fermented? A. Cane sugar B, Glucose C. Starch D. Vinegar
43. An alkanol can be prepared by the reaction of an alkene with A. concentrated tetraoxosulphate (VI) acid. B. bromine in tetrachloroethane. C. aqueous potassium tetraoxomaganate (Vll). D. sodium hydroxide solution.
44. A compound contains 7.75 percent hydrogen, 37.21 percent carbon and 55.04 percent chlorine. Determine the empirical formula of the compound. [H = 1.00; C = 12.0; Cl = 35.5] A.$ C_{3}H_{3}Cl$ B. $C_{2}H_{5}Cl$ C. $C_{3}H_{8}Cl$ D.
$C_{5}H_{2}Cl$
45. A tertiary alkanol has a molecular formula $C_{4}H_{10}O$. What is the structural formula of the compound? A. $(CH_{3})_2 CHCHOH$ B. $CH_{3}CH_{2}CH(OH)CH_3$ C. $CH_{3}COH$ D. $CH_{3}CH_{2}CH_{2}CH_{2}OH$
46. Which of the following industrial processes depends on the action of enzymes? A. Liquefaction of air B. Manufacture of soap C. Brewing of beer D. Catalytic cracking
47. Which of the following pollutants is not usually recycled?A.Aluminium cans B. Glass bottles C. Nuclear wastes D. Paper wastes
48. A metal that is widely used in the manufacture of paints and overhead electric cables is A. aluminium. B. copper. C. iron. D. lead.
49. Brass is mixture of A. Cu and Sn. B. Cu and Zn.
C. Cu and Mg. D. Cu and Pb.
50. Which of the following substances is mainly responsible for the depletion of the ozone layer? A. Oxygen B. Chlorofluorocarbon C. Carbon (II) oxide D. Nitrogen (II) oxide.
