Year :
2014
Title :
Chemistry
Exam :
WASSCE/WAEC MAY/JUNE
Paper 1 | Objectives
41 - 45 of 45 Questions
| # | Question | Ans |
|---|---|---|
| 41. |
The production of biogas from the fermentation of waste materials is an example of A. combustion B. incineration C. refining D. recycling |
D |
| 42. |
The purity of a solid sample can best be determined by its? A. boiling point B. melting point C. conductivity D. solubility Detailed Solution- The presence of impurities in a substance results in a lower melting point due to a process called melting point depression.- That implies a pure solid has a SHARP melting point which is of the standard value when compared. |
|
| 43. |
Which of the following gases is used to retard the vaporization of the filament in a light bulb? A. Argon B. Helium C. Hydrogen D. Oxygen |
A |
| 44. |
The most common process in the extraction of metals from their ore is A. catalysis B. electrolysis C. oxidation D. reduction |
D |
| 45. |
The oxide from electric power station is A. carbon (IV) oxide B. copper (ll) oxide C. nitrogen (IV) oxide D. sulphur (IV) oxide |
B |
| 41. |
The production of biogas from the fermentation of waste materials is an example of A. combustion B. incineration C. refining D. recycling |
D |
| 42. |
The purity of a solid sample can best be determined by its? A. boiling point B. melting point C. conductivity D. solubility Detailed Solution- The presence of impurities in a substance results in a lower melting point due to a process called melting point depression.- That implies a pure solid has a SHARP melting point which is of the standard value when compared. |
|
| 43. |
Which of the following gases is used to retard the vaporization of the filament in a light bulb? A. Argon B. Helium C. Hydrogen D. Oxygen |
A |
| 44. |
The most common process in the extraction of metals from their ore is A. catalysis B. electrolysis C. oxidation D. reduction |
D |
| 45. |
The oxide from electric power station is A. carbon (IV) oxide B. copper (ll) oxide C. nitrogen (IV) oxide D. sulphur (IV) oxide |
B |