1. Which of the following species determines the chemical properties of an atom? <br><br>
A. Electron<br>
B. Neutron<br>
C. Nucleus<br>
D. Proton<br><br>
2. The following glasswares are used to measure the volume of liquids except <br><br>
A. graduated beaker<br>
B. pipette<br>
C. test tube<br>
D. burette<br><br>
3. Pauli exclusion principle is related to <br><br>
A. quality of electrons in the valence shell<br>
B. filling the orbitals with lower energy first<br>
C. the filling of degenerated orbitals<br>
D. quantum numbers of electrons<br><br>
4. The species with no electron in the 3d- orbital is <br><br>
A. $Zn^{2+}$<br>
B. $Sc^{2+}$<br>
C. $Cu$<br>
D. $Mn$<br><br>
5. The separaring of oxygen from nitrogen by fractional distillation of air is possible because <br><br>
A. nitrogen is less dense than oxygen<br>
B. oxygen is more reactive than nitrogen<br>
C. the difference in their boioingn point<br>
D. they belong to the same period<br><br>
6. The purity of a solid sample can be determined by its <br><br>
A. boiling point<br>
B. melting point<br>
C. conductivity<br>
D. solubility<br><br>
7. The mass of one mole of $(NH_4)_2$ $CO_3$ is [O=16.0, N=14.0, C=12.0, H=1] <br><br>
A. $66.0g$<br>
B. $76.0g$<br>
C. $80.0g$<br>
D. $96.0g$<br><br>
8. Atomic orbital is <br><br>
A. the circular path through which electrons revolve around the nucleus.<br>
B. a region around the nucleus where electonsare most likely to be found.<br>
C. the path around the nucleus through which the protons move.<br>
D. the circular path through which electrons revolve around the proton <br><br>
9. The property of elements which increases down a group of the periodic table is <br><br>
A. electronegativity<br>
B. electron affinity<br>
C. ionic radius<br>
D. ionization energy<br><br>
10. The reason for the decrease in the atomic size of elements across a period is that <br><br>
A. nuclear charge increases while the outermost electrons are drawn closer to the nucleus.<br>
B. nuclear charge decreases while the outermost electrons are drawn closer to the nucleus.<br>
C. valence electron inrease across the period while the the valence shell remains constant.<br>
D. nucleus charge decreases while the distance of the valence shell from the nucleus is increasing.<br><br>
11. The oxidation number of nitrogen in $(PbNO_3)_2$ is <br><br>
A. $+2$<br>
B. $+3$<br>
C. $+4$<br>
D. $+5$<br><br>
12. Which of the following arrangements increases the correct decreasing order of ionization energy of perod 3 elements? <br><br>
A. $Na,Al,P,Cl$<br>
B. $Cl,P,Al,Na$<br>
C. $Na,P,Cl,Al$<br>
D. $Al,Na,P,Cl$<br><br>
13. Which of the following metals has the strongest metallic bond? <br><br>
A. $_{19}K$<br>
B. $_{13}Al$<br>
C. $_{12}Mg$<br>
D. $_{11}Na$<br><br>
14. Which of the following forces does not have van der Waal's forces? <br><br>
A. Copper<br>
B. Graphite<br>
C. Neon<br>
D. Iodine crystals<br><br>
15.The oxidation number of X in $XO_4^{3-}$ is <br><br>
A. $+1$<br>
B. $+3$<br>
C. $+4$<br>
D. $+5$<br><br>
16. The ionization energy is affected by the following factors except <br><br>
A. distance of the outermost electron(s) from the nucleus<br>
B. sice of the posiutive nuclear charge<br>
C. ability to attract shared electron(s)<br>
D. screening effect of the inner electron(s) <br><br>
17. Which of the following statements is correct? <br><br>
A. Covalent compounds would readily ionize in solution<br>
B. covalent compounds consist of ions<br>
C. Hydrogen bond is formed between a metal and a non-metal<br>
D. Ionic compounds in solution would conduct electricity<br><br>
18. The bond angle in tetrahedral molecules such as tetrachloromethane is <br><br>
A. $180.0^0$<br>
B. $109.5^0$<br>
C. $105.5^0$<br>
D. $90.0^0$<br><br>
19. The properties of a good primary standard include the following except <br><br>
A. high molecular mass<br>
B. low molecular mass <br>
C. high degree of purity<br>
D. readily available<br><br>
20. The use of diamonds in abrasives is due to its <br><br>
A. high melting point<br>
B. hardness<br>
C. octahedral shape<br>
D. durability<br><br>
21. Which of the following statements about endothermic reaction is correct? <br><br>
A. Activation energy is high<br>
B. A catalyst is required <br>
C. It occurs reversibly<br>
D. heat energy is absorbed <br><br>
22. A $0.1 moldm^{-3}$ solution of sodium hydroxide was diluted with distilled water to 0.001 $moldm^{-3}$. What is the dilution factor? <br><br>
A. 1000.00<br>
B. 100.00<br>
C. 10.00<br>
D. 0.01<br><br>
23. Graphite and diamond are similar in that they <br><br>
A. have octahedral shape<br>
B. have same density<br>
C. form carbon(IV)oxide on combustion<br>
D. coduct electricity<br><br>
24. In a saturated solution at a given temperature, the undissolved solutes are in equilibrum with <br><br>
A. the solvent<br>
B. dissolved solute particles<br>
C. the saturated solution<br>
D. insoluble solute particles<br><br>
25. The number of atoms present in 2.5 moles of a triatomic gas is equivalent to [1 mole= $6.0 \times 10^{23}$] <br><br>
A. $2.5 \times 10^{23}$<br>
B. $1.5 \times 10^{23}$<br>
C. $1.5 \times 10^{24}$<br>
D. $2.5 \times 10^{24}$<br><br>
26. When magnesium reacts with oxygen, heat is <br><br>
A. absorbed and the reaction is endothermic<br>
B. evolved and the reaction is endothermic <br>
C. evolved and the reaction is exothermic<br>
D. absorbed and the reaction is exothermic<br><br>
27. Which of the following gas is not acidic? <br><br>
A. $NO_2$<br>
B. $SO_2$<br>
C. $CO_2$<br>
D. $CO$<br><br>
28. A hydrocarbon contained 14.3% hydrogen. The empirical formula of the hydrocarbon would be [C=12, H=1] <br><br>
A. CH<br>
B. $CH_2$<br>
C. $CH_3$<br>
D. $CH_4$<br><br>
29. Which of the following statements is not the chemical property of an acid? <br><br>
A. Evolution of ammonia gas when heated to ammonia salts<br>
B. Evolution of $CO_2$ gas when heated to trioxocarbonate(IV) salts<br>
C. Formation of salt and water with alkalis <br>
D. Formation of salt and hydrogen gas with reactive metals<br><br>
30. Halogens generally react with metals to form <br><br>
A. alkalis<br>
B. acids <br>
C. bases<br>
D. salts<br><br>
31. Potassiu chloride solid does not conduct electricity because <br><br>
A. it is a covalent compound<br>
B. strong cohesive forces makes its ions immobile <br>
C. strong cohesive forces makes its molecules immobile<br>
D. each of pottassium and chlorine ions has noble gas structure<br><br>
32. When water was added to a white anhydious substances X, the colur changed to blue, X is <br><br>
A. $CuSO_4$<br>
B. $FeSO_4$<br>
C. $Na_2SO_4$<br>
D. $PbSO_4$<br><br>
33. Solubility curve can be applied in the determination of the <br><br>
A. amount of crystals formed <br>
B. amount of solvent that can be recovered <br>
C. amount of solid drugs in a given solution <br>
D. temperature of the solution<br><br>
34. If 0.2g of a salt is required to saturate $200cm^3$ of water at room temperature. What is the solubility of the salt? <br><br>
A. $0.2gdm^{-3}$<br>
B. $1.0gdm^{-3}$<br>
C. $2.0gdm^{-3}$<br>
D. $5.0gdm^{-3}$<br><br>
35. The property of a chemical reaction that is affected by a catalyst is the <br><br>
A. activation energy<br>
B. free energy<br>
C. equilibrum position<br>
D. enthalpy change<br><br>
36. Solule salts can be orepared by the following methods except <br><br>
A. neutralization<br>
B. reaction of an acid with trioxocarbonate (IV) salt <br>
C. double decomposition<br>
D. reaction of an acid with electropositive metals.<br>
37. Chemical reaction occurs when the colliding reactants have energy that is <br><br>
A. less than the activation energy<br>
B. greater than the activation energy<br>
C. greater than the energy of the product<br>
D. less than the energy of effective collusion.<br><br>
38. The common features of reactions at the anode is that <br><br>
A. electrons are consumed <br>
B. ions are reduced<br>
C. oxidation is involved <br>
D. the electrode dissolves <br><br>
39. Consider the following reaction equation: $2NO_{(g)}$ + $O_{2(g)}$ $\longrightarrow$ $2NO_{2(g)}$ What is the change in oxidation number of nitrogen? <br><br>
A. +2 to 0<br>
B. +2 to -2<br>
C. +2 to +4<br>
D. +4 to +2<br><br>
40. Which of the following factors characterize members of the same homologous series? <br><br>
A. The chemical properties change gradually throughout the series<br>
B. Physical properties of members are similar<br>
C. They have the same formula<br>
D. Successive members undergo changes in molecular formula by $CH_2$<br><br>
41. Calculate the mass of copper deposited if a current of 0.45 ampere flows through $CuSO_4$ solution for 1 hour 15 minutes. [Cu= 64.0, S= 32.0, O= 16.0, 1F= 96500C] <br><br>
A. 6.40g<br>
B. 0.67g<br>
C. 0.64g<br>
D. 0.45g<br><br>
42. Classifications of alkanols is based on the <br><br>
A. number of carbon atoms present in the compound<br>
B. molecular mass of the compound<br>
C. molecular formula of the compound<br>
D. number of alkyl1 groups bonded to the carbon having the hydroxy1 group.<br><br>
43. The name of the compound $C_4H_9COOC_3H_7$ is <br><br>
A. propy1 pentanoate<br>
B. penty1 propanoate <br>
C. buty1 propanoate<br>
D. propy1 butanoate<br><br>
44. Which of the following pairs of gases are pollutants from gas exhaust? <br><br>
A. Nitrogen(II) oxide and carbon (IV) oxide<br>
B. CArbon (IV) oxide and nitrogen<br>
C. Carbon (II) oxide and Sulphur (IV) oxide<br>
D. Carbon(II) oxidenajd oxygen<br><br>
45. Fats and oils can be obtained from any of the following sources except<br><br>
A. paraffin oil<br>
B. animals <br>
C. groundnuts <br>
D. palm kernel<br><br>
46. The condensation of two units of glucose will produce a dissacharide with the formula $C_{12} H_{22} O_{11}$ which is <br><br>
A. sucrose<br>
B. maltose<br>
C. galactose<br>
D. mannose<br><br>
47. The IUPAC name for the compound $ClCH_2CH_2OH$ is <br><br>
A. $1$-chloropropanol<br>
B. $2$-chloropropanol<br>
C. $1$-chloroethanol<br>
D. $2$-chloroethanol<br><br>
48. The real harmful effect of the release of cchloroflucarbon into the atmosphere is that it eventually causes <br><br>
A. excessive ultraviolet light from the sun to reach the earth surface<br>
B. excessive release of infrared light from the sun to the earth surface<br>
C. corrosive effect of the chemicals on human and animal<br>
D. acidic effects of chemical on humans <br><br>
49. See pages for figures <br><br>
50. Petroleum is a non-renewable source of energy because it <br><br>
A. is formed naturally<br>
B. is cheap<br>
C. can be recycled after the use<br>
D. cannot be regenerated once used up<br><br>
ANSWERS<br><br>
<table>
<thead>
<tr>
<th>1</th>
<th>A</th>
<th></th>
<th></th>
<th></th>
<th></th>
<th>21</th>
<th>D</th>
<th></th>
<th></th>
<th></th>
<th></th>
<th>41</th>
<th>B</th>
</tr>
</thead>
<tbody>
<tr>
<td>2</td>
<td>C</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>22</td>
<td>D</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>42</td>
<td>D</td>
</tr>
<tr>
<td>3</td>
<td>D</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>23</td>
<td>C</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>43</td>
<td>A</td>
</tr>
<tr>
<td>4</td>
<td>B</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>24</td>
<td>C</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>44</td>
<td>C</td>
</tr>
<tr>
<td>5</td>
<td>C</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>25</td>
<td>C</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>45</td>
<td>A</td>
</tr>
<tr>
<td>6</td>
<td>B</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>26</td>
<td>C</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>46</td>
<td>B</td>
</tr>
<tr>
<td>7</td>
<td>D</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>27</td>
<td>D</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>47</td>
<td>C</td>
</tr>
<tr>
<td>8</td>
<td>B</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>28</td>
<td>B</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>48</td>
<td>A</td>
</tr>
<tr>
<td>9</td>
<td>C</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>29</td>
<td>A</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>49</td>
<td>B</td>
</tr>
<tr>
<td>10</td>
<td>A</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>30</td>
<td>D</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>50</td>
<td>D</td>
</tr>
<tr>
<td>11</td>
<td>C</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>31</td>
<td>B</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>12</td>
<td>B</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>32</td>
<td>A</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>13</td>
<td>B</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>33</td>
<td>C</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>14</td>
<td>A</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>34</td>
<td>B</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>15</td>
<td>D</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>35</td>
<td>A</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>16</td>
<td>C</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>36</td>
<td>C</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>17</td>
<td>D</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>37</td>
<td>B</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>18</td>
<td>B</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>38</td>
<td>C</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>19</td>
<td>B</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>39</td>
<td>C</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>20</td>
<td>B</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>40</td>
<td>D</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
</tbody>
</table>
