Year :
2008
Title :
Chemistry
Exam :
WASSCE/WAEC MAY/JUNE
Paper 1 | Objectives
31 - 40 of 44 Questions
| # | Question | Ans |
|---|---|---|
| 31. |
Oxidation takes place at the anode during electrolysis because the anode A. is deficient in electrons B. is deficient in protons C. has excess electrons D. has attraction for positive ions |
C |
| 32. |
Calculate the quantity of electricity passed when 0.4 A flows for 1 hour 20 minutes through an electrolytic cell A. 4800C B. 3840 C C. 1920 C D. 32 C |
C |
| 33. |
A mixture of kerosene and diesel oil can be separated by A. crystallization B. distillation C. precipitation D. sublimation |
B |
| 34. |
Which of the following compounds would not give a precipitate with ammoniacal AgNO3 solution? A. CH3 C≡CCH3 B. HC≡CH C. CH3C≡CH D. CH3CH2C≡CH |
A |
| 35. |
When ethanol is heated with excess concentrated tetraoxosulphate (VI) acid, the organic product formed is A. ethanal B. ethanoic acid C. ethane D. ethene |
D |
| 36. |
The hydrolysis of groundnut oil by potassium hydroxide is known as A. hydrogenation B. saponification C. esteriffication D. neutralization |
B |
| 37. |
What is the main type of reaction alkenes undergo? A. Addition B. Condensation C. Elimination D. Substitutio |
A |
| 38. |
Arrange the following compounds in order of increasing boiling point A. I < II < IV < III B. IV < III < II < I C. I < II < III < IV D. IV < II < I < III Detailed SolutionHence, the arrangement is IV, II, I, III. |
|
| 39. |
A hydrocarbon containing 88.9% carbon has the empirical formula [H = 1 C = 12] A. CH B. CH2 C. C2H3 D. C2H5 Detailed Solutionelement : C | HAtomic Mass : 12.011 | 1.008 mass in 100 g of compound 88.9 | 11.100 we calculate the number of moles by dividing the mass by the atomic mass # moles in 100 g : 7.40155 | 11.01190 molar ratio 7.40155 : 11.01190 smallest No : 7.4015 divide by the smallest No. : 1.000 : 1.488 empirical formula is CH\(_2\) |
|
| 40. |
A solution of a salt was acidified with HCI when a few drops of BaCI2 solution were added, a white precipitate was formed. Which of the following anions is present in the salt? A. CO2- 3 B. NO- 3 C. SO2- 4 D. SO2- 3 |
C |
| 31. |
Oxidation takes place at the anode during electrolysis because the anode A. is deficient in electrons B. is deficient in protons C. has excess electrons D. has attraction for positive ions |
C |
| 32. |
Calculate the quantity of electricity passed when 0.4 A flows for 1 hour 20 minutes through an electrolytic cell A. 4800C B. 3840 C C. 1920 C D. 32 C |
C |
| 33. |
A mixture of kerosene and diesel oil can be separated by A. crystallization B. distillation C. precipitation D. sublimation |
B |
| 34. |
Which of the following compounds would not give a precipitate with ammoniacal AgNO3 solution? A. CH3 C≡CCH3 B. HC≡CH C. CH3C≡CH D. CH3CH2C≡CH |
A |
| 35. |
When ethanol is heated with excess concentrated tetraoxosulphate (VI) acid, the organic product formed is A. ethanal B. ethanoic acid C. ethane D. ethene |
D |
| 36. |
The hydrolysis of groundnut oil by potassium hydroxide is known as A. hydrogenation B. saponification C. esteriffication D. neutralization |
B |
| 37. |
What is the main type of reaction alkenes undergo? A. Addition B. Condensation C. Elimination D. Substitutio |
A |
| 38. |
Arrange the following compounds in order of increasing boiling point A. I < II < IV < III B. IV < III < II < I C. I < II < III < IV D. IV < II < I < III Detailed SolutionHence, the arrangement is IV, II, I, III. |
|
| 39. |
A hydrocarbon containing 88.9% carbon has the empirical formula [H = 1 C = 12] A. CH B. CH2 C. C2H3 D. C2H5 Detailed Solutionelement : C | HAtomic Mass : 12.011 | 1.008 mass in 100 g of compound 88.9 | 11.100 we calculate the number of moles by dividing the mass by the atomic mass # moles in 100 g : 7.40155 | 11.01190 molar ratio 7.40155 : 11.01190 smallest No : 7.4015 divide by the smallest No. : 1.000 : 1.488 empirical formula is CH\(_2\) |
|
| 40. |
A solution of a salt was acidified with HCI when a few drops of BaCI2 solution were added, a white precipitate was formed. Which of the following anions is present in the salt? A. CO2- 3 B. NO- 3 C. SO2- 4 D. SO2- 3 |
C |