Year :
1989
Title :
Chemistry
Exam :
WASSCE/WAEC MAY/JUNE
Paper 1 | Objectives
1 - 10 of 33 Questions
| # | Question | Ans |
|---|---|---|
| 1. |
The major raw material in a plastic industry is A. ethanol B. sulphur C. methylethanoate D. ethene E. ethane Detailed Solution- Earlier, molasses act as a raw material which yield ethanol from which ETHENE (gotten is used to) produce a range of poly(ethene) plastics.- Nowadays, starting new raw materials are obtained by the fractional distillation of crude oil or petroleum. - During the thermal cracking of petroleum; long chain alkanes are converted into smaller chain alkanes, ALKENES (with Ethene being the predominate), etc. - The Alkenes such as Ethene and Propene can be made into Poly(ethene) / plastic, nylon, etc. |
|
| 2. |
Which of the following reactions represents the laboratory preparation of hydrogen? A. C(s) + H 2 O(l) → CO(g) + H2(g) B. 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g) C. Zn(s) + 2HCI(aq) → ZnCI2(aq) + H2(g) D. Cu(s) + H2O(l) → CuO(s) + H2(g) E. 2AI(s) + 3H2O(l) → Al2O3(s) + 3H2(g) |
C |
| 3. |
Which of the following statements best explains cracking ? It is a process A. in which an alkene adds on itself repeatedly to form long chain polymers B. in which large hydrocarbon molecules are broken into smaller units C. for measuring theoctane number of petrol D. in which carbon chain results in a zigzag arrangement E. in which aromatic hydrocarbons are produced |
B |
| 4. |
120cm3 of hydrogen were sparked with 60cm 3 of oxygen at 110oC. What was the volume of stream produced? The equation for the reaction is 2H2(g) + O2(g) → 2H2O(g) A. 30cm3 B. 60cm3 C. 90cm3 D. 120cm3 E. 180cm3 |
D |
| 5. |
The earthly impurities in iron ore are removed in the blast furnace by the reaction A. CO2 + C →2CO B. Fe2O3 + 3CO →2Fe + 3CO2 C. SiO2 + CaO →CaSiO3 D. CaCO3 → CaO + CO2 E. C +CO2 → CO2 |
C |
| 6. |
Which of the following hydrocarbons is not likely to be present in petrol? A. C14H30 B. C10H22 C. C9H20 D. C7H16 E. C5H12 |
A |
| 7. |
The most suitable method to use when separating an insoluble solid from a liquid is A. evaporation B. filtration C. magnetization D. sublimation E. distillation |
B |
| 8. |
The following are miscible with water except A. ethylethanoate B. methanol C. ethanoic acid D. methanoic acid E. ethanol |
A |
| 9. |
If 200cm 3 of a gas at s.t.p. has a mass of 0.268g, what is its molar mass? (Molar volume of a gas at s.t.p. = 22.4 dm3) A. 300g B. 200g C. 150g D. 30g E. 15g |
D |
| 10. |
How many carbon atoms are there in a benzene ring? A. 4 B. 5 C. 6 D. 7 E. 8 |
C |
| 1. |
The major raw material in a plastic industry is A. ethanol B. sulphur C. methylethanoate D. ethene E. ethane Detailed Solution- Earlier, molasses act as a raw material which yield ethanol from which ETHENE (gotten is used to) produce a range of poly(ethene) plastics.- Nowadays, starting new raw materials are obtained by the fractional distillation of crude oil or petroleum. - During the thermal cracking of petroleum; long chain alkanes are converted into smaller chain alkanes, ALKENES (with Ethene being the predominate), etc. - The Alkenes such as Ethene and Propene can be made into Poly(ethene) / plastic, nylon, etc. |
|
| 2. |
Which of the following reactions represents the laboratory preparation of hydrogen? A. C(s) + H 2 O(l) → CO(g) + H2(g) B. 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g) C. Zn(s) + 2HCI(aq) → ZnCI2(aq) + H2(g) D. Cu(s) + H2O(l) → CuO(s) + H2(g) E. 2AI(s) + 3H2O(l) → Al2O3(s) + 3H2(g) |
C |
| 3. |
Which of the following statements best explains cracking ? It is a process A. in which an alkene adds on itself repeatedly to form long chain polymers B. in which large hydrocarbon molecules are broken into smaller units C. for measuring theoctane number of petrol D. in which carbon chain results in a zigzag arrangement E. in which aromatic hydrocarbons are produced |
B |
| 4. |
120cm3 of hydrogen were sparked with 60cm 3 of oxygen at 110oC. What was the volume of stream produced? The equation for the reaction is 2H2(g) + O2(g) → 2H2O(g) A. 30cm3 B. 60cm3 C. 90cm3 D. 120cm3 E. 180cm3 |
D |
| 5. |
The earthly impurities in iron ore are removed in the blast furnace by the reaction A. CO2 + C →2CO B. Fe2O3 + 3CO →2Fe + 3CO2 C. SiO2 + CaO →CaSiO3 D. CaCO3 → CaO + CO2 E. C +CO2 → CO2 |
C |
| 6. |
Which of the following hydrocarbons is not likely to be present in petrol? A. C14H30 B. C10H22 C. C9H20 D. C7H16 E. C5H12 |
A |
| 7. |
The most suitable method to use when separating an insoluble solid from a liquid is A. evaporation B. filtration C. magnetization D. sublimation E. distillation |
B |
| 8. |
The following are miscible with water except A. ethylethanoate B. methanol C. ethanoic acid D. methanoic acid E. ethanol |
A |
| 9. |
If 200cm 3 of a gas at s.t.p. has a mass of 0.268g, what is its molar mass? (Molar volume of a gas at s.t.p. = 22.4 dm3) A. 300g B. 200g C. 150g D. 30g E. 15g |
D |
| 10. |
How many carbon atoms are there in a benzene ring? A. 4 B. 5 C. 6 D. 7 E. 8 |
C |