1. Allotropes of an element differ in their?
A. Physical properties
B. Chemical properties
C. Mass numbers
D. Electronic configuration
2. What is the mass number of an element if its atom contains 10 protons, 10 electrons and 12 neutrons?
A. 32
B. 22
C. 20
D. 10
3. Given that the electronic configuration of an element X is $1s^22s^22p^63s^23p^4$, it can be deduced that X?
A. Belongs to group VI in the periodic table
B. Belongs to period 4 in the periodic table
C. Contains 3 unpaired electrons in the ground state
D. Has atomic number 27
4. P,Q,R and S are metals in the same group in the periodic table but in periods 3, 4, 5, and 6 respectively. Which of them loses electrons least readily?
A. P
B. Q
C. R
D. S
5. Elements which belong to the same group in the periodic group are characterized by?
A. Difference of +1 in the oxidation numbers of successive members.
B. Presence of the same number of outermost electrons in the respective atoms.
C. Difference of 14 atomic mass units between successive members.
D. Presence of the same number of electron shells in the respective atoms.
6. The atom of an element X has teo electorns in its outermost shell. What is the formula of the compound formed when X combines with aluminium $(_{13}Al)$?
A. $AlX_2$
B. $Al_2X$
C. $Al_2X_2$
D. $Al_2X_3$
7. The presence of unpaired electrons in an atom of a transition metal gives rise to?
A. Paramegnetism
B. Malleability
C. Ductility
D. Shiny apperarance
8. What is responsible for mettalic bonding?
A. Sharing of electrons between the metal atoms
B. Attraction between the atomic nuclei and cloud of electrons
C. Transfer of electrons from one atom to another
D. Attraction between positive and negative ions.
9. Which of the following compounds is covalent?
A. $CaCl_2$
B. MgO
C. NaH
D. $CH_4$
10. A sheet of paper is placed in the path of a beam from a radioactive source. The emissions that pass through the paper consist of?
A. Alpha particles and gamma rays
B. Alpha and beta particles
C. Beta particles and gamma rays.
D. Alpha particles only
11. Which of the following features of a human skeleton can be determined by carbon-dating?
A. Height
B. Mass
C. Age
D. Race
12. Which of the following statements about ideal gases is/are correct. I. The cohesive forces between their particles are negligible. II. They have no definite volume, but occupy the volume of their containers. III. They are not compressible. IV.Their particles collide with loss of energy.
A. I only
B. I and II only
C. I, II and III only
D. I,II,III and IV
13. $P_{Total}$ = $P_1 + P_2 + P_3 + ..........P_n$, where $P_{Total}$ is the pressure of a mixture of gases. The equation above is an expression of?
A. Graham's law
B. Gay-Lussac's law
C. Boyle's law
D. Dalton's law
14. If $1.0dm^3$ of gas X diffuses through a porous plug in 60 seconds while the same volume of hydrogen diffuses in 15 seconds under the same condition, calculate the relative molecular mass of X. [H = 1.0]
A. 4.0
B. 8.0
C. 16
D. 32
15. Which of the following pairs of reagents react to produce hydrogen?
A. Zinc and concentrated trioxonitrate (V) acid
B. Water and calcium dicarbide
C. Copper and dilute hydrochloric acid
D. Magnesium and dilute tetraoxosulphate (VI) acid
16. A mixture of calcium chloride and calcium trioxocarbonate (IV) in water can be separated by?
A. Evaporation
B. Sublimation
C. Distillation
D. Filtration
17. Which of the following would dissolve in warm dilute $H_2SO_4$ without effervescence, to give a blue solution?
A. Copper turnings
B. Copper (II) trioxocarbonate (IV)
C. Copper (II) oxide
D. Copper alloy
18. In which of the reactions represented by the following equations is $HNO_3$ behaving as a typical acid?
A. CaO + $2HNO_3$ $\longrightarrow$ $CaO(NO_3)_2$ + $H_2O$.
B. Cu + $4HNO_3$ $\longrightarrow$ $Cu(NO_3)_2$ + $2H_2O$ + $ 2NO_2$.
C. S + $6HNO_3$ $\longrightarrow$ $H_2SO_4$ + $6NO_2$ + $2H_2O$
D. P + $5HNO_3$ $\longrightarrow$ $H_3PO_4$ + $5NO_2$ + $H_2O$
Use the following information to answer Questions 19 and 20
A gas was evolved when a sample of gastric juice reacted with sodium trioxocarbonate (IV)
19. The gas evolved was?
A. $NH_3$
B. $SO_2$
C. HCl
D. $CO_2$
20. It can be concluded that gastric juice
A. Contains enzymes
B. Is acidic
C. Is a mixture
D. Has pH value of 7
21. See pages for figures
22. See pages for figures
23. See pages for figures
24. What is the oxidation number of nitrogen $Cu^{2+}$ in $Al(NO_3)_3$?
A. +1
B. +3
C. +5
D. +6
25. What is oxidized in the reaction represented by the equation by the following equation? 3Cu + $8HNO_3$ $\longrightarrow$ $3Cu(NO_3)_2$ + 2NO + $4H_2O$?
A. Oxygen
B.Hydrogen
C. Nitrogen
D. Copper
26. Which of the following substances decomposes when an electric current is passed through it?
A. Glucose solution
B. Zinc rod
C. Hydrochloric acid
D. Tetrachloromethane
27. A concentrated solution containig $H^+$, $OH^-$ and $Cl^-$ was electrolyzed using platinum electrodes. Which of the ions will be discharged at the cathode?
A. $H^+$
B. $Cu^2+$
C. $OH^-$
D. $Cl^-$
28. Given that the order of reactivivity of four metals is P>Q>R>S, which of the following reactions is feasible?
A. S + $P^+$ $\longrightarrow$ P + $S^+$
B. Q + $S^+$ $\longrightarrow$ S + $Q^+$
C. R + $P^+$ $\longrightarrow$ P + $R^+$
D. S + $Q^+$ $\longrightarrow$ Q + $S^+$
29. In the electrolysis of $CuSO_4(aq)$ using copper electrodes, the reaction at the anode is?
A. Discharge of $SO^2-_4$
B. Discharge of $OH^-$
C. Dissolution of copper electrodes
D. Evolution of oxygen
30. A feasible cell was constructed by joining the two half cells thus: $Cu^2+_(aq)$ + $2e^-$ $\longrightarrow$ $Cu_(s) E^o$ = +0.34v $Zn^2+_(aq)$ + $2e^-$ $\longrightarrow$ $Zn_(s) E^o$ + -0.76V. What is the standard e.m.f of the cell?
A. -1.1V
B. -0.42V
C. +0.42V
D. +1.1V
31. Hydrogenation of butene yields ?
A. Butyne
B. Butane
C. Pentene
D. Butanol
32. Benzene produces more soot than ethene on burning because benzene?
A. Has a higher molar mass
B. Has a higher degree of unsaturation
C. Undergoes both substitution and addition reactions.
D. Is a liquid at room temperature
33. See pages for figures
34. Which of the following fractions of crude oil is likely to contain the hydrocarbon $C_{12}H_{26}$?
A. Kerosene
B. Naptha
C. Gas oil
D. Fuel oil
35. See pages for figures
36. Which of the following compounds exhibits both structural isomerism and cis-trans isomerism?
A. $C_4H_8$
B. $CH_3OCH_3$
C. $C_5H_12$
D. $C_6H_6$
37. If X reacts with excess acidified $K_2Cr_2O_7$ to produce an alkanoic acid, X is an?
A. Alkanol
B. Alkene
C. Amino acid
D. Alkanone
38. One of the products of combustion of pentane in excess air is?
A. Pentanol
B. Pentene
C. Nitrogen (II) oxide
D. Carbon (IV) oxide
39. Which of the following polymers contains nitrogen?
A. Nylon
B. Polyvinyl chloride
C. Polyethene
D. Cellulose
40. What is the function of $H_2SO_4$ in the following reaction? $C_{12}H_{22}O_{11}$ conc. $H_2SO_4$ 12C + $_{11}H_20$
A. Oxidizing agent
B. Strong acid
C. Dehydrating agent
D. Catalyst
41. Which of the following establishments uses the process of fermentation in its operation?
A. Fertilizer plant
B. Textile industry
C. Brewery
D. Soap manufacturing industry
42. Sugars can be hydrolyzed at room temperature by the action of
A. Mineral acids
B. Strong bases
C. Enzymes
D. Oxidants
43. Which of the following constitutes an advantage in the use of hard water?
A. Formation of scum with soap
B. Furring of kettles
C. Blockage of water pipes
D. Formation of strong bones
44. Which of the following compounds is readily soluble in water?
A. CuO
B. AgCl
C. $Na_2SO_4$
D. $CaCO_3$
45. Calculate the mass of $ZnSO_4$ produced when excess of $ZnCO_3$ is added to $50.0cm^3$ of 4.00 $mol dm^-3$ $H_2SO_4$. The equation for the reaction is: $ZnCO_3$ + $H_2SO_4$ $\longrightarrow$ $ZnSO_4$ + $CO_2$ + $H_2O$ [$ZnSO_4$ = 161 g $mol^{-1}$]
A. 0.200g
B. 1.29g
C. 32.2g
D. 39.0g
46. $10cm^3$ of distilled water is added to $10cm^3$ of an aqueous salt solution , the concentration of the solution
A. Increases
B. Decreases
C. Remains constant
D. Doubles
47. Which of the following reactions represents the change that occurs when a photographic film is exposed to sunlight?
A. Ag $\longrightarrow$ $Ag^+$ + $e^-$
B. $Ag^+$ + $e^-$ $\longrightarrow$ Ag
C. 2Ag + $Br_2$ $\longrightarrow$ 2AgBr
D. $Ag^+$ + Br $\longrightarrow$ AgBr
48. The main type of reaction that occurs in the blast furnace during the extraction of iron is?
A. Reduction reaction
B. Decomposition
C. Exothermic reaction
D. Combustion
49. Acidic industrial waste can be treated with?
A. Lime
B. Brine
C. Water
D. Ethanool
50. Waste plastics accumulate in the soil and pollute the environment because plastic materials are?
A. Insoluble in water
B. Non-biodegradeable
C. Easily affected by hesat
D. Inflammable
| Question | Answer |
|---|---|
| 1 | A |
| 2 | B |
| 3 | A |
| 4 | D |
| 5 | B |
| 6 | D |
| 7 | A |
| 8 | B |
| 9 | D |
| 10 | C |
| 11 | C |
| 12 | B |
| 13 | D |
| 14 | C |
| 15 | D |
| 16 | D |
| 17 | A |
| 18 | A |
| 19 | D |
| 20 | B |
| 21 | B |
| 22 | B |
| 23 | D |
| 24 | C |
| 25 | D |
| 26 | C |
| 27 | B |
| 28 | A |
| 29 | C |
| 30 | A |
| 31 | B |
| 32 | A |
| 33 | D |
| 34 | A |
| 35 | C |
| 36 | B |
| 37 | A |
| 38 | D |
| 39 | A |
| 40 | C |
| 41 | C |
| 42 | D |
| 43 | D |
| 44 | C |
| 45 | C |
| 46 | B |
| 47 | B |
| 48 | A |
| 49 | A |
| 50 | B |