Year :
2019
Title :
Chemistry
Exam :
WASSCE/WAEC MAY/JUNE
Paper 1 | Objectives
1 - 10 of 50 Questions
| # | Question | Ans |
|---|---|---|
| 1. |
The periodic table is an arrangement of elements according to their? A. Oxidation number B. Atomic number C. Mass number D. Nunber of neutrons Detailed SolutionElements are arranged in order of increasing atomic number |
|
| 2. |
A solid with higher melting and boiling points is likely to be? A. Covalent compound B. A Dative compound C. An Electrovalent compound D. A Non-metal Detailed SolutionIonic Compounds / Electrovalent compounds Have A High Melting Point and High Boiling Point. |
|
| 3. |
Which of the following metals reacts slowly with cold water? A. Iron B. Silver C. Calcium D. Pottassium Detailed SolutionCalcium reacts very slowly with cold water |
|
| 4. |
Which of the following elements has the highest ionization energy? A. Calcium B. Chlorine C. Flourine D. Magnesium |
D |
| 5. |
The bleaching action of chlorine is through the process? A. Hydration B. Hydrolysis C. Reduction D. Oxidation Detailed SolutionThe bleaching action lof chlorinr is due to its ability to react with water to form oxochlorate(i)acid |
|
| 6. |
If 6.5g of magnesium ribbon reacts completely with Hydrochloric acid, how many grams of hydrogen gas would be liberated?Mg(s) + 2 HCl(aq) --> MgCl 2(aq) + H 2(g)[ H = 1.0, Mg = 24.0 ] A. 0.54g B. 0.70g C. 1.08g D. 1.40g Detailed Solution24g of Mg will liberate 2g of H: 6.5g of Mg will liberate Xg of H = ( 6.5 X 2 ) / 24 = 0.5416g of Hygrogen ( H ) |
|
| 7. |
Calcium and magnesium belong to the group of the periodic table because both? A. are metals B. form cations C. form colourless salts D. have same number of valence electrons |
D |
| 8. |
Which of the substances is non-polar? A. Bromine B. Ammonia C. Water D. Hydrogen Bromide Detailed SolutionBr2 (Bromine) is nonpolar because, in this molecule, both bromine atoms have the same electronegativity due to which both atoms have equal charge distribution and results in a net-zero dipole moment. |
|
| 9. |
Which of the following pairs of components have the same molecular mass?[ H = 1.0, C = 12.0, O = 16.0 ] A. Ethene and Ethyne B. Ethane and Ethene C. Carbon (ii) Oxide and Ethene D. Carbon (iv) Oxide and Ethyne Detailed SolutionEthene = 28Ethyne = 26 Carbon(ii)Oxide = 28 Carbon(iv)Oxide = 44 |
|
| 10. |
When an equilibrium is established between dissolved and undissolved solutes, the solution is said to be? A. Saturated B. Unsaturated C. Concentrated D. Diluted Detailed SolutionThe term saturated solution is defined in chemistry as a solution in which no more solute can be dissolved in the solvent. |
| 1. |
The periodic table is an arrangement of elements according to their? A. Oxidation number B. Atomic number C. Mass number D. Nunber of neutrons Detailed SolutionElements are arranged in order of increasing atomic number |
|
| 2. |
A solid with higher melting and boiling points is likely to be? A. Covalent compound B. A Dative compound C. An Electrovalent compound D. A Non-metal Detailed SolutionIonic Compounds / Electrovalent compounds Have A High Melting Point and High Boiling Point. |
|
| 3. |
Which of the following metals reacts slowly with cold water? A. Iron B. Silver C. Calcium D. Pottassium Detailed SolutionCalcium reacts very slowly with cold water |
|
| 4. |
Which of the following elements has the highest ionization energy? A. Calcium B. Chlorine C. Flourine D. Magnesium |
D |
| 5. |
The bleaching action of chlorine is through the process? A. Hydration B. Hydrolysis C. Reduction D. Oxidation Detailed SolutionThe bleaching action lof chlorinr is due to its ability to react with water to form oxochlorate(i)acid |
| 6. |
If 6.5g of magnesium ribbon reacts completely with Hydrochloric acid, how many grams of hydrogen gas would be liberated?Mg(s) + 2 HCl(aq) --> MgCl 2(aq) + H 2(g)[ H = 1.0, Mg = 24.0 ] A. 0.54g B. 0.70g C. 1.08g D. 1.40g Detailed Solution24g of Mg will liberate 2g of H: 6.5g of Mg will liberate Xg of H = ( 6.5 X 2 ) / 24 = 0.5416g of Hygrogen ( H ) |
|
| 7. |
Calcium and magnesium belong to the group of the periodic table because both? A. are metals B. form cations C. form colourless salts D. have same number of valence electrons |
D |
| 8. |
Which of the substances is non-polar? A. Bromine B. Ammonia C. Water D. Hydrogen Bromide Detailed SolutionBr2 (Bromine) is nonpolar because, in this molecule, both bromine atoms have the same electronegativity due to which both atoms have equal charge distribution and results in a net-zero dipole moment. |
|
| 9. |
Which of the following pairs of components have the same molecular mass?[ H = 1.0, C = 12.0, O = 16.0 ] A. Ethene and Ethyne B. Ethane and Ethene C. Carbon (ii) Oxide and Ethene D. Carbon (iv) Oxide and Ethyne Detailed SolutionEthene = 28Ethyne = 26 Carbon(ii)Oxide = 28 Carbon(iv)Oxide = 44 |
|
| 10. |
When an equilibrium is established between dissolved and undissolved solutes, the solution is said to be? A. Saturated B. Unsaturated C. Concentrated D. Diluted Detailed SolutionThe term saturated solution is defined in chemistry as a solution in which no more solute can be dissolved in the solvent. |