Year :
1991
Title :
Chemistry
Exam :
WASSCE/WAEC MAY/JUNE
Paper 1 | Objectives
11 - 20 of 35 Questions
| # | Question | Ans |
|---|---|---|
| 11. |
The products of the electrolysis of dilute sodium chlorid solution with platinum electrodes are A. hydrogen and oxygen B. oxygen and chlorine C. chlorine and water D. sodium amalgam and chlorine E. sodium hydroxide and water |
A |
| 12. |
Which of the following modes of motion is exhibited by the particles of a solid? A. Vibrational and random motion B. Vibrational and translational motion C. Translational and random motion D. Vibrational motion only E. Translational motion only Detailed SolutionThe cohesive forces binding the particles of a solid are strong enough to restrict their movement so that they are held together in a fixed point. They only vibrate and rotate about their fixed point. |
|
| 13. |
Which of the following statements is not correct? Group 7 elements A. are diatomic B. are good oxidizing agents C. are highly electronegative D. have relatively low ionization potentials E. have high electron affinity |
D |
| 14. |
In which of the following are the substances arranged in their correct order of increasing melting point? A. Sodium chloride, sulphur, diamond B. Diamond, sodium chloride, sulphur C. Sulphur, sodium chloride, diamond D. Diamond, sulphur, sodium chloride E. Sulphur, diamond, sodium chloride |
C |
| 15. |
A compound which liberates carbon (IV) oxide from a hydrogentrioxocarbonate (lV) could have the molecular formula A. C2H5OH B. C 3H 4 C. HCOOH D. H2O2 E. C6H6 |
C |
| 16. |
CH4(g) + 2O2(g) → 2H2O(l) + CO2(g) ∆H = 890KJ mo-1 ∆H in the reaction represented by the equation above is the enthalpy of A. formation B. combustion C. solution D. activation E. neutralization |
B |
| 17. |
Consider the reaction represented by the equation below: H2(g) + 12(s) ⇌ 2HI(g) ∆H negative. Which of the following takes place when the temperature of the reaction vessel is decreased? A. the gases condense B. the yield of hydrogen increases C. the concentration of the reactants remain constant D. more of the hydrogen iodide decomposes E. the yield of hydrogen iodide increases |
E |
| 18. |
2NaNO3 → 2NaNO2 + O2. From the equation above, what is the volume of oxygen produced at s.t.p. when 8.5g of 2NaNO3 is heated until no further gas is evolved? (2NaNO3 = 85, molar volume of gases at s.t.p. = 22.4dm3) A. 1.12dm3 B. 2.24dm3 C. 4.48dm3 D. 11.2dm3 E. 22.4dm3 Detailed Solution85g of 2NaNO\(_3\) will liberated 22.4dm\(_3\)8.5g = xdm\(_3\) cross multiply: x = [8.5 * 22.4] / 85 x = 2.24dm\(_3\) : 8.5g of 2NaNO\(_3\) will liberated 2.24dm\(_3\) |
|
| 19. |
Esterification of propane 1,2,3-triol and unsaturated higher carboxylic acids will produce A. fats B. soap C. methly-propanoate D. alkanols E. oils |
C |
| 20. |
The ratio of reactants to products is 1: 3: 2 in the reaction represented by the equation below: N2,/SUB> (g) → 2NH3(g) which of the following law is demonstrated by this? A. Boyle's law B. Law of multiple proportion C. Gay Lussac's law D. Law of constant composition E. Avogadro's law |
C |
| 11. |
The products of the electrolysis of dilute sodium chlorid solution with platinum electrodes are A. hydrogen and oxygen B. oxygen and chlorine C. chlorine and water D. sodium amalgam and chlorine E. sodium hydroxide and water |
A |
| 12. |
Which of the following modes of motion is exhibited by the particles of a solid? A. Vibrational and random motion B. Vibrational and translational motion C. Translational and random motion D. Vibrational motion only E. Translational motion only Detailed SolutionThe cohesive forces binding the particles of a solid are strong enough to restrict their movement so that they are held together in a fixed point. They only vibrate and rotate about their fixed point. |
|
| 13. |
Which of the following statements is not correct? Group 7 elements A. are diatomic B. are good oxidizing agents C. are highly electronegative D. have relatively low ionization potentials E. have high electron affinity |
D |
| 14. |
In which of the following are the substances arranged in their correct order of increasing melting point? A. Sodium chloride, sulphur, diamond B. Diamond, sodium chloride, sulphur C. Sulphur, sodium chloride, diamond D. Diamond, sulphur, sodium chloride E. Sulphur, diamond, sodium chloride |
C |
| 15. |
A compound which liberates carbon (IV) oxide from a hydrogentrioxocarbonate (lV) could have the molecular formula A. C2H5OH B. C 3H 4 C. HCOOH D. H2O2 E. C6H6 |
C |
| 16. |
CH4(g) + 2O2(g) → 2H2O(l) + CO2(g) ∆H = 890KJ mo-1 ∆H in the reaction represented by the equation above is the enthalpy of A. formation B. combustion C. solution D. activation E. neutralization |
B |
| 17. |
Consider the reaction represented by the equation below: H2(g) + 12(s) ⇌ 2HI(g) ∆H negative. Which of the following takes place when the temperature of the reaction vessel is decreased? A. the gases condense B. the yield of hydrogen increases C. the concentration of the reactants remain constant D. more of the hydrogen iodide decomposes E. the yield of hydrogen iodide increases |
E |
| 18. |
2NaNO3 → 2NaNO2 + O2. From the equation above, what is the volume of oxygen produced at s.t.p. when 8.5g of 2NaNO3 is heated until no further gas is evolved? (2NaNO3 = 85, molar volume of gases at s.t.p. = 22.4dm3) A. 1.12dm3 B. 2.24dm3 C. 4.48dm3 D. 11.2dm3 E. 22.4dm3 Detailed Solution85g of 2NaNO\(_3\) will liberated 22.4dm\(_3\)8.5g = xdm\(_3\) cross multiply: x = [8.5 * 22.4] / 85 x = 2.24dm\(_3\) : 8.5g of 2NaNO\(_3\) will liberated 2.24dm\(_3\) |
|
| 19. |
Esterification of propane 1,2,3-triol and unsaturated higher carboxylic acids will produce A. fats B. soap C. methly-propanoate D. alkanols E. oils |
C |
| 20. |
The ratio of reactants to products is 1: 3: 2 in the reaction represented by the equation below: N2,/SUB> (g) → 2NH3(g) which of the following law is demonstrated by this? A. Boyle's law B. Law of multiple proportion C. Gay Lussac's law D. Law of constant composition E. Avogadro's law |
C |