Year :
2005
Title :
Chemistry
Exam :
JAMB Exam
Paper 1 | Objectives
41 - 49 of 49 Questions
| # | Question | Ans |
|---|---|---|
| 41. |
The most suitable metal that can be used as lightning conductor is? A. silver B. copper C. iron D. aluminium Detailed SolutionIn reality, silver actually has an even higher electrical conductivity than copper, but silver is too expensive to use. |
|
| 42. |
 In the diagram above which of the cures illustrates Arrhenius' law? A. Y B. Z C. R D. X |
D |
| 43. |
The most abundant element on the earth's crust is A. nitrogen B. hydrogen C. oxygen D. flourine Detailed Solution- The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen.HOWEVER; - Earth's crust is made up of several elements: oxygen, 46.6 percent by weight; silicon, 27.7 percent; aluminum, 8.1 percent; iron, 5 percent; calcium, 3.6 percent; sodium, 2.8 percent, potassium, 2.6 percent, and magnesium, 2.1 percent. - This implies that Oxygen is the most abundant element (by mass) in the Earth's crust, making up almost half of the crust's mass |
|
| 44. |
Metalliods are also referred to as A. semi-metals B. metals C. colliods D. non-metals |
A |
| 45. |
The ores that can be concentrated by flotation are A. nitride ores B. sulphide ores C. oxide ores D. non-metals |
B |
| 46. |
The property used in the industrial preparation of nitrogen and oxygen from air is? A. rate of diffusion B. density C. boiling point D. solubility Detailed SolutionFractional distillation of liquefied air, with Nitrogen distilling as a vapor at a lower boiling point of -196°C while O2 is left as a liquid. |
|
| 47. |
In a flame test for calcium, the flame appears A. green when viewed through a blue glass B. blue when viewed through a blue glass C. orange -red when viewed through a blue glass D. brick-red when viewed through a blue-glass Detailed SolutionWhen a Calcium compound is held in a non-luminous Bunsen flame and viewed directly with the naked eye, it is seen as brick red,then as light green as seen through blue glass. |
|
| 48. |
Which of the following alloys contain iron? A. Duralumin and steel B. Brass and bronze C. Steel and permalloy D. Soft solder and duralumin |
C |
| 49. |
To obtain pure carbon (II) oxide from its mixture with carbon (IV) oxide, the mixture should be A. passed over heated copper (II) oxide B. bubbled through water C. bubbled through concentrated tetroxosulphate (VI) acid D. bubbled through sodium hydroxide |
D |
| 41. |
The most suitable metal that can be used as lightning conductor is? A. silver B. copper C. iron D. aluminium Detailed SolutionIn reality, silver actually has an even higher electrical conductivity than copper, but silver is too expensive to use. |
|
| 42. |
In the diagram above which of the cures illustrates Arrhenius' law? A. Y B. Z C. R D. X |
D |
| 43. |
The most abundant element on the earth's crust is A. nitrogen B. hydrogen C. oxygen D. flourine Detailed Solution- The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen.HOWEVER; - Earth's crust is made up of several elements: oxygen, 46.6 percent by weight; silicon, 27.7 percent; aluminum, 8.1 percent; iron, 5 percent; calcium, 3.6 percent; sodium, 2.8 percent, potassium, 2.6 percent, and magnesium, 2.1 percent. - This implies that Oxygen is the most abundant element (by mass) in the Earth's crust, making up almost half of the crust's mass |
|
| 44. |
Metalliods are also referred to as A. semi-metals B. metals C. colliods D. non-metals |
A |
| 45. |
The ores that can be concentrated by flotation are A. nitride ores B. sulphide ores C. oxide ores D. non-metals |
B |
| 46. |
The property used in the industrial preparation of nitrogen and oxygen from air is? A. rate of diffusion B. density C. boiling point D. solubility Detailed SolutionFractional distillation of liquefied air, with Nitrogen distilling as a vapor at a lower boiling point of -196°C while O2 is left as a liquid. |
|
| 47. |
In a flame test for calcium, the flame appears A. green when viewed through a blue glass B. blue when viewed through a blue glass C. orange -red when viewed through a blue glass D. brick-red when viewed through a blue-glass Detailed SolutionWhen a Calcium compound is held in a non-luminous Bunsen flame and viewed directly with the naked eye, it is seen as brick red,then as light green as seen through blue glass. |
|
| 48. |
Which of the following alloys contain iron? A. Duralumin and steel B. Brass and bronze C. Steel and permalloy D. Soft solder and duralumin |
C |
| 49. |
To obtain pure carbon (II) oxide from its mixture with carbon (IV) oxide, the mixture should be A. passed over heated copper (II) oxide B. bubbled through water C. bubbled through concentrated tetroxosulphate (VI) acid D. bubbled through sodium hydroxide |
D |