1. The periodic table is an arrangement of elements according to their
A. Oxidation number
B. Atomic number
C. Mass number
D. Number of neutron
2. A solid substance with high melting and boiling points is likely to be
A. A covalent compound
B. A dative covalent compound
C. An electrovalent compound
D. A non-metal
3. Which of the following metals reacts slowly with colld water?
A. Iron
B. Silver
C. Calcium
D. Potassium
4. Which of the following elements has the highest ionization energy?
A. Calcium
B. Chlorine
C. Fluorine
D. Magnesium
5. The bleaching action of chlorine is through the process of
A. Hydration
B. Hydrolysis
C. Reduction
D. Oxidation
6. If 6.5g of mangnesium ribbon reacts completely with hydrochloric acid, how many grams of hydrogen gas would be liberated?
$Mg_{(s)}$ + $2HCl_{(aq)}\longrightarrow MgCl_{2_{(aq)}}$ + $H_{2_{(g)}}$ [H = 1.0. Mg =24.0]
A. 0.54g
B. 0.70g
C. 1.08g
D. 1.40g.
7. Calcium and magnesium belong to the same group of the periodic table because both
A. Are metals
B. Form cations
C. Form colourless salts
D. Have same number of valence electrons.
8. Which of the folllowing substances is non-polar?
A. $Br_2$
B. $NH_3$
C. ${H_2}O$
D. $HB_r$
9. Which of the following pairs of components have the same molecular mass? [H = 1.0, C = 12.0, O = 16.0]
A. Ethene andethyne
B. Ethane and ethene
C. Carbon (II)oxide and ethene
D. Carbon (IV)oxide and ethyne.
10. When an equilibrum is established between dissolved and undissolved solutes, the solution is to be
A. Saturated
B. Unsaturated
C. Concentrated
D. Dilute
11. How many moles of carbon (IV)oxide contains 16.0g of oxygen? [C =12.0, O = 16.0]
A. 0.20 mol
B. 0.25 mol
C. 0.40 mol
D. 0.50 mol
12. Stoichoimetry is based on the law of
A. Multiple proportion
B. Constant composition
C. Conservation of energy
D. Conservation of mass
13. What is the percentage by mass of hydrogen in $CH_3COOH$? [$CH_3COOH$ = 60]
A. 1.7%
B. 5.0%
C. 6.7%
D. 7.1%
14. Which of the following compound has coordinate bonds in its structure?
A. ${Al_2}{Cl_6}$
B. $Mg{Cl_2}$
C. $Agcl$
D. $NaCl$
15. The name of the compound $C{H_3}C{(CH_3)_2}C{H_2}C{H_3}$ is
A. 2-methyl butane
B. 2,2-dimethyl butane
C. 2-methyl pentane
D. 2,2-dimethyl pentane
16. The properties of a good priamry standard include the following except
A. High molecular mass
B. Low molecular mass
C. High degree of purity
D. Readily available
17. What is the solubility of a salt X at $25^0C$ if the saturated solution of the salt contains 0.28g in 100cm3 of solution? [X = 56.0g]
A. $0.05 mol dm^{-3}$
B. $0.10 mol dm^{-3}$
C. $2.60 mol dm^{-3}$
D. $2.80 mol dm^{-3}$
18. Vinegar is an aqueous solution of
A. Hydrochloric acid
B. Ethanediotic acid
C. Ethanoic acid
D. Hydrofluoric acid.
19. Which of the following solutions containing one mole per dm-3 of the compound would have the lowest pH?
A. Ethanoic acid
B. Hydrochloric acid
C. Sodium chloride
D. Sodium hydrogentrioxocarbonate (IV)
20. A sample of air was bubbled into water. The pH of the waterslowly cahnged from 7 to 6. Which of the following gases in the samples caused the change?
A. Carbon (IV)oxide
B. Carbon (II)oxide
C. Nitrogen
D. Oxygen
21. The most suitable indicator for the reaction between $NaOH_{(aq)}$ and HCOOH(aq) is
A. Bromocresol
B. Methyl orange
C. Methyl red
D. Phenolphthalein
22. Consider the following reaction equation: $2Al{(OH)_3}$ + $3{H_2}{SO_4}\longrightarrow Al{_2}(S{O_4})_3$ +$6{H_2}O$. How many moles of tetraoxosulphate (VI) acid is needed to produce 0.5 mol of aluminium tetraoxosulphate (VI)?
A. 0.5
B. 1.0
C. 1.5
D. 3.0
23. Which of the following pairs of substances has the highest heat of neutralization?
A. Strong acid and strong base
B. Weak acid and weak base
C. Strong acid and weak base
D. Weak acid and strong base
24. When quicklime dissolves in water,
A. Heat is absorbed
B. Heat is evolved
C. Oxygen is liberated
D. Hydrogen is given off
25. If the value of H is positive for a reaction, it means that the reaction is
A. Exothermic
B. Endothermic
C. Spontaneous
D. Slow
26. Which of the following compounds is formed by the oxidation of ethanol?
A. $C_2H_4CO_2H$
B. $C_2H_5CO_2H$
C. $CH_3OH$
D. $CH_3CO_2H$
27. What is the characteristic of the gas liberated when diluted hydrochloric acid is added to iron (II) sulphide?
A. Turns lime water milky
B. Decolorizes bromine water
C. Gives a pop sound
D. Turns lead(II) ehanoate paper black.
28. An organic compound contains 72% carbon, 12% hydrogen and 16% oxygen by mass. What is the emperical formula of thr compound? [H = 1.0, C = 12.0, O = 16.0]
(a) $C_3H_8O$
(b) $C_6H_{12}$
(c) $C_6H_{12}O_2$
(d) $C_{12}H_{12}O_{11}$
29. Whenexcess chlorine is mixed with ethane at room temprature, the product formed is
A. 1,2-dichloroethane
B. 1,2-dichloroethene
C. 1,1-dichloroethane
D. 1,1- dichloroethene
30. Which of the following reagents could be used to distinguish between propan-1-ol and propan -2-ol?
A. $H+/{K_2}{Cr_2}{O_7}$
B. ${I_2}/OH$
C. $C{H_3}COOH$
D. $NaCl$
31. If a catalyst is added to a system at equilibrum and the temprature and pressure remain constant, there would be no effect on the
A. Activation energy of the reaction
B. Rate of the forward reaction
C. Rate of the reverse reaction
D. Heat of reaction
32. Consider the following reaction equation: 3CL2 + 2NH3 – N2 + 6HCL NH3 is acting as
A. A reducing agent
B. A dehydrating agent
C. A drying agent
D. An oxidozing agent
33. The oxidation number of chromium in $Cr_2 O_7^{2-}$ is
A. +4
B. +5
C. +6
D. +7
34. The process by which alkanoic acid reacts reversibly with alkanols is known as
A. Sapomification
B. Esterification
C. Carboxylation
D. Halogenation
35. If the oxidation potential of Mg and AI are +2.37 volts and +1.66 volts respectively, then Mg would
A. Not replace AI
B. Be replaced by AI
C. Remain in the solution
D. Replace AI
36. See pages for figures
37. In a mixture of gases which do not react chemically together, the pressure of the individual gas is
A. atmospheric pressure
B. vapour pressure
C. total pressure
D. partial pressure
38. Biotechnology is applied in the
A. treatment of sewage
B. treatment of water
C. purification of chemicals
D. purification of metals
39. Which of the following organic compounds has the lowest boiling point?
A. $C_6H_{14}$
B. $C_5H_{12}$
C. $C_4H_{10}$
D. $(CH_3)_3CH$
40. See pages for figures
41. Which of the following substances can be considered as heavy chemical?
A. $CaOCl_2$
B. $H_2SO_4$
C. $AgNO_3$
D. $CaO$
42. In Boyle's law,
A. T is constant, while P varies directly with P
B. P is constant, while V varies inversely with T
C. V is constant, while P varies directly with T
D. T is constant, while V varies inversely with P
43. Which of the following apparatus is not used in volumetric analysis?
A.Pipette
B. Burette
C. Desiccator
D. Conical flask
44. One of the deductions from Rutherford's alpha particle scattering experiments is that
A. electrons are negatively charged
B. electrons have negligible mass
C. nuclei of atoms are positively charged
D. protons are positively charged
45. The atoms $^{64}_{29}Cu$ and $^{65}_{30}Z{_n}$ have the same number of
A. nucleons
B. electrons
C. neutrons
D. protons
46. The number of electrons in the 3d orbital of $_{24}Cr$ is
A. $2$
B. $3$
C. $4$
D. $5$
47. The method used to collect a gas in the laboratory depends on its I. boiling point II. density III. smell IV. solubility in water
A.I and II only
B. II and IV only
C. III and IV only
D. I,II,III and Iv only
48. Which of the following methods is not used to separate mixtures?
A.Chromatography
B. Crystallization
C. Distillation
D. Electrolysis
49. The group to which elements belong in the periodic table is determined by the number of
A. electrons
B. core electrons
C. valence shells
D. valence electrons
50. Kipps apparatus can be used to prepare
A. $H_2$
B. $NH_3$
C. $O_2$
D. $H_2S$
ANSWERS
1
A
21
A
41
B
2
B
22
B
42
A
3
D
23
C
43
B
4
C
24
D
44
A
5
B
25
B
45
C
6
C
26
B
46
D
7
A
27
A
47
C
8
D
28
A
48
C
9
A
29
D
49
D
10
C
30
B
50
B
11
D
31
A
12
A
32
A
13
A
33
C
14
B
34
A
15
B
35
B
16
A
36
B
17
C
37
A
18
C
38
B
19
A
39
A
20
C
40
A
