Year :
1990
Title :
Chemistry
Exam :
WASSCE/WAEC MAY/JUNE
Paper 1 | Objectives
1 - 10 of 32 Questions
| # | Question | Ans |
|---|---|---|
| 1. |
Catalytic hydrogenation of oils results in the production of A. soaps B. detergents C. alkanes D. butter E. margarine |
E |
| 2. |
Which of the following reaction will not take place under normal conditions? A. Zn(s) + 2HCI2(aq) + H 2(g) B. Fe (s) + H 2SO4(aq) → FeSO4(aq) + H2(g) C. Cu (s) + 2HCI (aq) → CuCI 2(aq) + H2(g) D. Ca(s) + 2H Ca(OH)2(g) E. 2Na(s) + 2H 2O (1) → 2NaOH(aq) + H2(g) |
C |
| 3. |
A sample of orange juice is suspected to have been contaminated with a yellow dye. Which of the following methods can be used to detect the dye? A. Decantation B. Chromatography C. Distillation D. Filtration E. Evaporation |
B |
| 4. |
The electronic configuration 1s2 22s 22p 63s23p 6 is that of a A. noble gas B. Group ll element C. Group lll element D. Group V element E. Group VI element |
A |
| 5. |
The heat accompanying the reaction represented by the equation H2O (l) → H 2O(g) is described as the heat of A. solution B. neutralization C. vaporization D. sublimation E. activation |
C |
| 6. |
Aluminum is above iron in the electrochemical series, yet iron corrodes easily on exposure to air while aluminium does not. This is because aluminium A. has a lower density than iron B. is a better conductor than iron C. does not corrode spontaneously D. forms thin layer of inert oxide in moist air E. forms amphoteric oxides while iron does not |
D |
| 7. |
When a solid melts and consequently boils, there is A. a gradual increase in the average kinetic energy of the particles B. a sudden decrease in the kinetic energy of the particles C. no change in the average kinetic energy of the particles D. a rapid change in the nature of bonding of the components E. a change in the size of the fundamental particles Detailed Solution- When a metal melts or boils, this is a change of physical state. Energy is transferred to a substance to melt or boil it.- an increase in temperature will increase the average kinetic energy of the molecules. - This energy is needed to overcome the forces of attraction between the metal ions and the delocalize electrons in the metal. The more energy needed, the higher the melting point or boiling point . |
|
| 8. |
Which of the following compounds will undergo additional reactions? A. Ethyne B. Butane C. Pentane D. Tetrachloromethane E. Ethanol |
A |
| 9. |
Which of the following reactions does not occur in the blast furnace during the extraction of iron? A. Fe2O3 (s) + 3CO(g) → 2Fe(l) + 3CO2(g) B. C2 + CO 2(g) C. CaO(s) + SiO2(s) → CaSiO 3(s) D. FeO(s) + CO2(g) + Fe(l) E. 2Fe2O(s) → 4Fe(l) 3O2(g) |
E |
| 10. |
A catayst which increases the rate of a chemical reaction does so by A. increasing the reaction pathway B. increasing the surface area of the reactants C. increasing the pressure on the system D. decreasing the temperature at which the reaction occurs E. decreasing the activation energy of the reaction |
E |
| 1. |
Catalytic hydrogenation of oils results in the production of A. soaps B. detergents C. alkanes D. butter E. margarine |
E |
| 2. |
Which of the following reaction will not take place under normal conditions? A. Zn(s) + 2HCI2(aq) + H 2(g) B. Fe (s) + H 2SO4(aq) → FeSO4(aq) + H2(g) C. Cu (s) + 2HCI (aq) → CuCI 2(aq) + H2(g) D. Ca(s) + 2H Ca(OH)2(g) E. 2Na(s) + 2H 2O (1) → 2NaOH(aq) + H2(g) |
C |
| 3. |
A sample of orange juice is suspected to have been contaminated with a yellow dye. Which of the following methods can be used to detect the dye? A. Decantation B. Chromatography C. Distillation D. Filtration E. Evaporation |
B |
| 4. |
The electronic configuration 1s2 22s 22p 63s23p 6 is that of a A. noble gas B. Group ll element C. Group lll element D. Group V element E. Group VI element |
A |
| 5. |
The heat accompanying the reaction represented by the equation H2O (l) → H 2O(g) is described as the heat of A. solution B. neutralization C. vaporization D. sublimation E. activation |
C |
| 6. |
Aluminum is above iron in the electrochemical series, yet iron corrodes easily on exposure to air while aluminium does not. This is because aluminium A. has a lower density than iron B. is a better conductor than iron C. does not corrode spontaneously D. forms thin layer of inert oxide in moist air E. forms amphoteric oxides while iron does not |
D |
| 7. |
When a solid melts and consequently boils, there is A. a gradual increase in the average kinetic energy of the particles B. a sudden decrease in the kinetic energy of the particles C. no change in the average kinetic energy of the particles D. a rapid change in the nature of bonding of the components E. a change in the size of the fundamental particles Detailed Solution- When a metal melts or boils, this is a change of physical state. Energy is transferred to a substance to melt or boil it.- an increase in temperature will increase the average kinetic energy of the molecules. - This energy is needed to overcome the forces of attraction between the metal ions and the delocalize electrons in the metal. The more energy needed, the higher the melting point or boiling point . |
|
| 8. |
Which of the following compounds will undergo additional reactions? A. Ethyne B. Butane C. Pentane D. Tetrachloromethane E. Ethanol |
A |
| 9. |
Which of the following reactions does not occur in the blast furnace during the extraction of iron? A. Fe2O3 (s) + 3CO(g) → 2Fe(l) + 3CO2(g) B. C2 + CO 2(g) C. CaO(s) + SiO2(s) → CaSiO 3(s) D. FeO(s) + CO2(g) + Fe(l) E. 2Fe2O(s) → 4Fe(l) 3O2(g) |
E |
| 10. |
A catayst which increases the rate of a chemical reaction does so by A. increasing the reaction pathway B. increasing the surface area of the reactants C. increasing the pressure on the system D. decreasing the temperature at which the reaction occurs E. decreasing the activation energy of the reaction |
E |