Year :
2005
Title :
Chemistry
Exam :
JAMB Exam
Paper 1 | Objectives
21 - 30 of 49 Questions
| # | Question | Ans |
|---|---|---|
| 21. |
The air around smelting industries is likely to contain A. H2S, CO and N2 B. CO2, SO3 and H2 C. H2, SO2 and CO2 D. SO2, N2 and CO2 |
C |
| 22. |
Kerosine is commonly used to remove the red colour stain of palm oil from cloths because it A. helps to spread the oil over a larger surface area B. react with the oil to form an odourless compound C. makes the oil evaporate easily by dissolving it D. helps to dilute the oil and reduce its colour |
C |
| 23. |
The gas that is the most dangerous pollutant to human is A. sulphur (IV) oxide B. carbon (IV) oxide C. nitrogen (II) oxide D. hydrogen sulphide |
D |
| 24. |
Natural water collected from rivers and ponds contain oxygen, carbon (IV) oxide and A. nitrogen B. hydrogen C. chlorine D. sulphur E. oxide |
A |
| 25. |
How many moles of limestone will be required to produce 5.6g of CaO? A. 0.20 mol B. 0.10 mol C. 1.12 mol D. 0.56 mol Detailed SolutionCaCO3 → CaO + CO2CaCO3 = 40 + 12 + 16 * 3 = 100, CaO = 40 + 16 = 56 56gt of CaO was produced by 100g of CaCO3 ∴ 5.6g of CaO will produce by (5.6 * 100)/56 = 10g of CaCO3 moles = mass/molar mass = 10/100 = 0.10m |
|
| 26. |
The shape of the hydrocarbon compound CH4 is A. square planar B. planar C. linear D. tetrahedral |
D |
| 27. |
Which of these properties gives a solid its definite shape? A. strong intermolecular attraction B. high melting point C. high boiling point D. weak intermolecular attraction |
A |
| 28. |
Sugar is separated from its impurities by A. precipitation B. crystallization C. distillation D. evaporation |
B |
| 29. |
The component of an atom that contributes least to its mass is the A. proton B. nucleus C. neutron D. electron |
D |
| 30. |
An element wil readily form an electrovalent compound if it electron configuration is A. 2, 8, 1 B. 2, 8, 4 C. 2, 8, 8 D. 2, 8, 5 |
A |
| 21. |
The air around smelting industries is likely to contain A. H2S, CO and N2 B. CO2, SO3 and H2 C. H2, SO2 and CO2 D. SO2, N2 and CO2 |
C |
| 22. |
Kerosine is commonly used to remove the red colour stain of palm oil from cloths because it A. helps to spread the oil over a larger surface area B. react with the oil to form an odourless compound C. makes the oil evaporate easily by dissolving it D. helps to dilute the oil and reduce its colour |
C |
| 23. |
The gas that is the most dangerous pollutant to human is A. sulphur (IV) oxide B. carbon (IV) oxide C. nitrogen (II) oxide D. hydrogen sulphide |
D |
| 24. |
Natural water collected from rivers and ponds contain oxygen, carbon (IV) oxide and A. nitrogen B. hydrogen C. chlorine D. sulphur E. oxide |
A |
| 25. |
How many moles of limestone will be required to produce 5.6g of CaO? A. 0.20 mol B. 0.10 mol C. 1.12 mol D. 0.56 mol Detailed SolutionCaCO3 → CaO + CO2CaCO3 = 40 + 12 + 16 * 3 = 100, CaO = 40 + 16 = 56 56gt of CaO was produced by 100g of CaCO3 ∴ 5.6g of CaO will produce by (5.6 * 100)/56 = 10g of CaCO3 moles = mass/molar mass = 10/100 = 0.10m |
| 26. |
The shape of the hydrocarbon compound CH4 is A. square planar B. planar C. linear D. tetrahedral |
D |
| 27. |
Which of these properties gives a solid its definite shape? A. strong intermolecular attraction B. high melting point C. high boiling point D. weak intermolecular attraction |
A |
| 28. |
Sugar is separated from its impurities by A. precipitation B. crystallization C. distillation D. evaporation |
B |
| 29. |
The component of an atom that contributes least to its mass is the A. proton B. nucleus C. neutron D. electron |
D |
| 30. |
An element wil readily form an electrovalent compound if it electron configuration is A. 2, 8, 1 B. 2, 8, 4 C. 2, 8, 8 D. 2, 8, 5 |
A |