Year :
2020
Title :
Chemistry
Exam :
WASSCE/WAEC MAY/JUNE
Paper 1 | Objectives
11 - 20 of 49 Questions
| # | Question | Ans |
|---|---|---|
| 11. |
Group VIl elements in their combined states are called? A. Halogens B. Anions C. Halide D. Cations Detailed SolutionHalide: A binary compound of a halogen with another element or group. |
|
| 12. |
When an ionic bond is broken, bonding electrons are A. shared between participating atoms B. gained by the most electropositive atom C. gained by the most electronegative atom D. lost by both participating atoms. |
B |
| 13. |
The oxidation state of chlorine in NaClO\(_3\) is? A. +1 B. +3 C. +5 D. +6 Detailed Solutionthe oxidation number of chlorine in NaClO3 is +5. |
|
| 14. |
A balanced chemical equation is based on the law of? A. Periodicity B. Constant composition C. Multiple proportion D. Conservation of mass Detailed SolutionThe law of conservation of mass is important because it allows us to predict the amount of product formed in a chemical reaction, as well as the amount of consumed reactant. |
|
| 15. |
Which of the following pairs of elements has the greatest difference in electronegativity? A. Na and F B. Na and CI C. Na and Br D. Na and I Detailed Solution- sodium has an electro negativity of 0.93- Hence; sodium and flourine have the highest difference. |
|
| 16. |
A factor that is considered most important when siting a chemical industry is? A. nearness to other industrial establishments B. nearness to raw materials C. favourable climate conditions D. availability of storage facilities |
B |
| 17. |
The boiling point of pentane is higher than that of propane because? A. carbon-carbon single bonds are stronger than carbon-hydrogen bonds. B. Pentane has more covalent bonds to break C. Pentane does not burn easily as propane D. The intermolecular forces in pentane are stronger than those of propane Detailed SolutionThe boiling points of alkanes increase with increasing number of carbons. This is because the intermolecular attractive forces, although individually weak, become cumulatively more significant as the number of atoms and electrons in the molecule increases. |
|
| 18. |
Which of the following solids would not decompose on heating? A. Ammonium chloride B. Lead (i) trioxonitrate (V) C. Potassium trioxocarbonate (IV) D. Sodium hydrogen trioxocarbonate (IV) Detailed Solutiontrioxoxcarbonates (iv) of Na & K are stable to heat |
|
| 19. |
The following molecules have double covalent bonds between two atoms except? A. oxygen B. carbon (IV)oxide C. ethene D. water Detailed SolutionIn the case of water, hydrogen bonds form between neighboring hydrogen and oxygen atoms of adjacent water molecules. The attraction between individual water molecules creates a bond known as a hydrogen bond. |
|
| 20. |
The type of isomerism exhibited by cis and trans isomers is? A. positional B. geometrical C. functional D. optical Detailed Solution- Cis–trans isomerism, also known as geometric isomerism or configurational isomerism arises when atoms or groups are arranged differently in space due to restricted rotation of a bond or bonds in a molecule. |
| 11. |
Group VIl elements in their combined states are called? A. Halogens B. Anions C. Halide D. Cations Detailed SolutionHalide: A binary compound of a halogen with another element or group. |
|
| 12. |
When an ionic bond is broken, bonding electrons are A. shared between participating atoms B. gained by the most electropositive atom C. gained by the most electronegative atom D. lost by both participating atoms. |
B |
| 13. |
The oxidation state of chlorine in NaClO\(_3\) is? A. +1 B. +3 C. +5 D. +6 Detailed Solutionthe oxidation number of chlorine in NaClO3 is +5. |
|
| 14. |
A balanced chemical equation is based on the law of? A. Periodicity B. Constant composition C. Multiple proportion D. Conservation of mass Detailed SolutionThe law of conservation of mass is important because it allows us to predict the amount of product formed in a chemical reaction, as well as the amount of consumed reactant. |
|
| 15. |
Which of the following pairs of elements has the greatest difference in electronegativity? A. Na and F B. Na and CI C. Na and Br D. Na and I Detailed Solution- sodium has an electro negativity of 0.93- Hence; sodium and flourine have the highest difference. |
| 16. |
A factor that is considered most important when siting a chemical industry is? A. nearness to other industrial establishments B. nearness to raw materials C. favourable climate conditions D. availability of storage facilities |
B |
| 17. |
The boiling point of pentane is higher than that of propane because? A. carbon-carbon single bonds are stronger than carbon-hydrogen bonds. B. Pentane has more covalent bonds to break C. Pentane does not burn easily as propane D. The intermolecular forces in pentane are stronger than those of propane Detailed SolutionThe boiling points of alkanes increase with increasing number of carbons. This is because the intermolecular attractive forces, although individually weak, become cumulatively more significant as the number of atoms and electrons in the molecule increases. |
|
| 18. |
Which of the following solids would not decompose on heating? A. Ammonium chloride B. Lead (i) trioxonitrate (V) C. Potassium trioxocarbonate (IV) D. Sodium hydrogen trioxocarbonate (IV) Detailed Solutiontrioxoxcarbonates (iv) of Na & K are stable to heat |
|
| 19. |
The following molecules have double covalent bonds between two atoms except? A. oxygen B. carbon (IV)oxide C. ethene D. water Detailed SolutionIn the case of water, hydrogen bonds form between neighboring hydrogen and oxygen atoms of adjacent water molecules. The attraction between individual water molecules creates a bond known as a hydrogen bond. |
|
| 20. |
The type of isomerism exhibited by cis and trans isomers is? A. positional B. geometrical C. functional D. optical Detailed Solution- Cis–trans isomerism, also known as geometric isomerism or configurational isomerism arises when atoms or groups are arranged differently in space due to restricted rotation of a bond or bonds in a molecule. |