Year :
2013
Title :
Chemistry
Exam :
WASSCE/WAEC MAY/JUNE
Paper 1 | Objectives
11 - 20 of 47 Questions
| # | Question | Ans |
|---|---|---|
| 11. |
In the periodic table, alkaline earth metals can be found in group A. l B. ll C. VI D. VII |
B |
| 12. |
In which of the following series are the atoms arranged in order of increasing ionization energy? A. Li, Na K B. B, Be, Li C. O, F, Ne D. Be, mG, Ca Detailed SolutionThe ionization energy increases across the period. It increases up the group. |
|
| 13. |
Which of the following bond types is responsible for the high boiling point of water? A. Metallic bond B. Covalent bond C. lonic bond D. Hydrogen bond Detailed SolutionThe high boiling point is due to the breaking of the intermolecular force called Hydrogen bond. |
|
| 14. |
In metallic solid, the forces of attraction is between the mobile valence electrons and the A. atoms B. neutrons C. negative ions D. positively charged nuclei |
D |
| 15. |
The bonds in crystalline ammonium chloride are A. covalent and dative B. ionic and covalent C. ionic, covalent and dative D. ionic, covalent and hydrogen bond Detailed SolutionN makes three covalent bonds with three Hydrogen and a coordinate (dative covalent) bond with with hydrogen ion, forming ammonium ion (NH\(_4 ^+\). The ammonium ion forms an ionic bond with chloride ion to form NH\(_4\)Cl. |
|
| 16. |
Which of the following elements is diatomic? A. Sodium B. Oxygen C. Iron D. Neon Detailed SolutionThe seven diatomic elements are Hydrogen, Nitrogen, Oxygen, Fluorine, Chlorine, Iodine, Bromine. |
|
| 17. |
Noble gas molecules are held together by A. van der Waals forces B. hydrogen bonds C. dative bonds D. covalent bonds |
A |
| 18. |
Which of the following statements about nuclear reaction is correct? The reaction A. involves neutrons only B. takes place inside the nucleus C. is governed by temperature and pressure D. involves protons and electrons only Detailed SolutionA nuclear reaction is semantically considered to be the process in which two nuclei, or a nucleus and an external subatomic particle, collide to produce one or more new nuclides. |
|
| 19. |
Consider the reaction represented by the following equation: C\(_2\)H\(_2\) + yH\(_2\) → C\(_2\)H\(_6\). The value of y in the reaction is A. 4 B. 3 C. 2 D. 1 Detailed SolutionC\(_2\)H\(_2\) + yH\(_2\) → C\(_2\)H\(_6\)To balance the equation, we must have 2 carbon atoms on both sides and 6 hydrogen atoms. On the LHS and RHS, carbon = 2 atoms. On the LHS, Hydrogen = 2 + 2y. On the RHS, Hydrogen = 6. ⇒ 2 + 2y = 6 2y = 4 y = 2. |
|
| 20. |
The volume of 0.25 moldm-3 solution of KOH that would yield 6.5g of of solid KOH on evaporation is (K = 39.0; o = 16.0; H = 1.00) A. 464.30 cm3 B. 625.00 cm3 C. 1000.00 cm3 D. 2153.80 cm3 |
A |
| 11. |
In the periodic table, alkaline earth metals can be found in group A. l B. ll C. VI D. VII |
B |
| 12. |
In which of the following series are the atoms arranged in order of increasing ionization energy? A. Li, Na K B. B, Be, Li C. O, F, Ne D. Be, mG, Ca Detailed SolutionThe ionization energy increases across the period. It increases up the group. |
|
| 13. |
Which of the following bond types is responsible for the high boiling point of water? A. Metallic bond B. Covalent bond C. lonic bond D. Hydrogen bond Detailed SolutionThe high boiling point is due to the breaking of the intermolecular force called Hydrogen bond. |
|
| 14. |
In metallic solid, the forces of attraction is between the mobile valence electrons and the A. atoms B. neutrons C. negative ions D. positively charged nuclei |
D |
| 15. |
The bonds in crystalline ammonium chloride are A. covalent and dative B. ionic and covalent C. ionic, covalent and dative D. ionic, covalent and hydrogen bond Detailed SolutionN makes three covalent bonds with three Hydrogen and a coordinate (dative covalent) bond with with hydrogen ion, forming ammonium ion (NH\(_4 ^+\). The ammonium ion forms an ionic bond with chloride ion to form NH\(_4\)Cl. |
| 16. |
Which of the following elements is diatomic? A. Sodium B. Oxygen C. Iron D. Neon Detailed SolutionThe seven diatomic elements are Hydrogen, Nitrogen, Oxygen, Fluorine, Chlorine, Iodine, Bromine. |
|
| 17. |
Noble gas molecules are held together by A. van der Waals forces B. hydrogen bonds C. dative bonds D. covalent bonds |
A |
| 18. |
Which of the following statements about nuclear reaction is correct? The reaction A. involves neutrons only B. takes place inside the nucleus C. is governed by temperature and pressure D. involves protons and electrons only Detailed SolutionA nuclear reaction is semantically considered to be the process in which two nuclei, or a nucleus and an external subatomic particle, collide to produce one or more new nuclides. |
|
| 19. |
Consider the reaction represented by the following equation: C\(_2\)H\(_2\) + yH\(_2\) → C\(_2\)H\(_6\). The value of y in the reaction is A. 4 B. 3 C. 2 D. 1 Detailed SolutionC\(_2\)H\(_2\) + yH\(_2\) → C\(_2\)H\(_6\)To balance the equation, we must have 2 carbon atoms on both sides and 6 hydrogen atoms. On the LHS and RHS, carbon = 2 atoms. On the LHS, Hydrogen = 2 + 2y. On the RHS, Hydrogen = 6. ⇒ 2 + 2y = 6 2y = 4 y = 2. |
|
| 20. |
The volume of 0.25 moldm-3 solution of KOH that would yield 6.5g of of solid KOH on evaporation is (K = 39.0; o = 16.0; H = 1.00) A. 464.30 cm3 B. 625.00 cm3 C. 1000.00 cm3 D. 2153.80 cm3 |
A |