Year :
2005
Title :
Chemistry
Exam :
WASSCE/WAEC MAY/JUNE
Paper 1 | Objectives
1 - 10 of 37 Questions
| # | Question | Ans |
|---|---|---|
| 1. |
The electronic configuration of an element X is 1s22s 22s63p 2 3p4. It can be deduced that X A. Belongs to group 6 of the Periodic Table B. Belongs to group IV of the Periodic Table C. has 3 unpaired electrons in its atom D. has relative molecular mass of 16 |
A |
| 2. |
What is the mass number of an element having 20 neutrons, 15 protons and 15 electrons? A. 15 B. 30 C. 35 D. 50 Detailed SolutionMass number = Protons = Neutrons = 15 + 20 = 35 |
|
| 3. |
Which of the following sets of elements are arranged in order of decreasing atomic size in the Periodic Table? A. 6C, 4Be, 7N,8 O B. 4Be,6 C,7 N,8 O C. 8O, 7 N, 6C, 4Be D. 7N, 8O, 6C,4BeBe |
B |
| 4. |
Which of the following changes is characteristic of an alpha-particle emission? A. the nucleus loses two protons and two neutrons B. a proton combines with an electron giving off heat C. the nucleus splits into two equal parts D. four neutrons are lost |
A |
| 5. |
An element X has an atomic number of 16. What is its most likely oxidation state in its binary compounds? A. -3 B. -2 C. +2 D. +4 |
B |
| 6. |
An element which can exist in two or more forms in the same physical state, exhibits A. isotopy B. structural isomerism C. allotropy D. variable valency |
C |
| 7. |
Which of the following can be used to predict the type of bonding in HCI? A. pH value B. Electronegativity difference C. Heat of neutralization D. Heat of solution |
B |
| 8. |
Which of the following molecules has a linear structure? A. NH3 B. H2O C. CO2 D. CH4 |
C |
| 9. |
The volume occupied by a given mass of gas depends on its A. diffusion rate B. temperature and pressure C. degree of solubility D. relative density |
B |
| 10. |
In which of the following reactions is the position of equilibrium not affected by an increase in pressure? A. 3Fe(s) + 4H2O(g) ⇌ Fe3O4(s) + 4H2(g) B. 2NO2(g) ⇌ N2O 4(g) C. 3H2(g) + N2(g) ⇌ 2NH3(g) D. 2SO2(g) + O2(g) ⇌ 2SO3(g) |
A |
| 1. |
The electronic configuration of an element X is 1s22s 22s63p 2 3p4. It can be deduced that X A. Belongs to group 6 of the Periodic Table B. Belongs to group IV of the Periodic Table C. has 3 unpaired electrons in its atom D. has relative molecular mass of 16 |
A |
| 2. |
What is the mass number of an element having 20 neutrons, 15 protons and 15 electrons? A. 15 B. 30 C. 35 D. 50 Detailed SolutionMass number = Protons = Neutrons = 15 + 20 = 35 |
|
| 3. |
Which of the following sets of elements are arranged in order of decreasing atomic size in the Periodic Table? A. 6C, 4Be, 7N,8 O B. 4Be,6 C,7 N,8 O C. 8O, 7 N, 6C, 4Be D. 7N, 8O, 6C,4BeBe |
B |
| 4. |
Which of the following changes is characteristic of an alpha-particle emission? A. the nucleus loses two protons and two neutrons B. a proton combines with an electron giving off heat C. the nucleus splits into two equal parts D. four neutrons are lost |
A |
| 5. |
An element X has an atomic number of 16. What is its most likely oxidation state in its binary compounds? A. -3 B. -2 C. +2 D. +4 |
B |
| 6. |
An element which can exist in two or more forms in the same physical state, exhibits A. isotopy B. structural isomerism C. allotropy D. variable valency |
C |
| 7. |
Which of the following can be used to predict the type of bonding in HCI? A. pH value B. Electronegativity difference C. Heat of neutralization D. Heat of solution |
B |
| 8. |
Which of the following molecules has a linear structure? A. NH3 B. H2O C. CO2 D. CH4 |
C |
| 9. |
The volume occupied by a given mass of gas depends on its A. diffusion rate B. temperature and pressure C. degree of solubility D. relative density |
B |
| 10. |
In which of the following reactions is the position of equilibrium not affected by an increase in pressure? A. 3Fe(s) + 4H2O(g) ⇌ Fe3O4(s) + 4H2(g) B. 2NO2(g) ⇌ N2O 4(g) C. 3H2(g) + N2(g) ⇌ 2NH3(g) D. 2SO2(g) + O2(g) ⇌ 2SO3(g) |
A |