Year :
1988
Title :
Chemistry
Exam :
JAMB Exam
Paper 1 | Objectives
11 - 20 of 45 Questions
| # | Question | Ans |
|---|---|---|
| 11. |
Which of the following will produce the greatest increase in the rate of the chemical reaction represented by the equation Na2S2O3(aq) + 2HCl(aq) → 2NaCI(aq) + H2O(I) + SO2(g) + S(g)? A. A decrease in temperature and an increase in the concentration of the reactants B. An increase in the temperature and a decrease in the cocentration of the reactants C. An increase in temperature and an increase in the concentration of the reactants D. A decrease in the temperature and a decrease in the concentration of the reactants |
C |
| 12. |
Which of the followingstatements is TRUE? A. The dissolution of NaOH(s) in water is endothermic B. The heat os solution of NaOH(s) is positive C. The NaOH(s) gains heat from the surroundings D. The heat of solution of NaOH(s) is negative |
D |
| 13. |
Which property of a reversible reaction is affected by a catalyst? A. Heat content (enthalphy) B. Energy of activation C. Free energy change D. Equilibrium position |
B |
| 14. |
Which of the following is used in fire extinguishers? A. Carbon (ll) oxide B. Carbon (lV) oxide C. Sulphur (lV) oxide D. Ammonia |
B |
| 15. |
When H2S gas is passed into a solution of iron (III) chloride, the colour changes from yellow to green. This is because? A. H(s)S is reduced to S B. Fe3+ ions are oxidized by H(s)S C. Fe3+ ions are oxidized Fe3+ ions D. Fe3+ ions are reduced to Fe2+ ions |
D |
| 16. |
Suitable reagents for the laboratory preparation nitrogen are? A. sodium dioxonitrate (III) and ammonium chloride B. sodium dioxonitrate (V) and ammonium chloride C. sodium chloride and ammonium chloride D. sodium chloride and ammonium diozonitrate (III) |
A |
| 17. |
The thermal decomposition of copper (ll)trioxonitrate (V) yields copper (ll) oxide, oxygen and? A. nitrogen (ll) oxide B. nitrogen (l) oxide C. nitrogen (lV) oxide D. nitrogen |
C |
| 18. |
Chlorine is produced commmercially by? A. electrolysis of dilute hydrochloric acid B. electrolysis of brine C. neutralization of hydrogen chloride D. heating potassium trioxochlorate (V) |
B |
| 19. |
Aluminium is extracted commercially from its ore by? A. heating aluminium oxide with coke in a furance B. the electrolysis of fused aluminium oxide in cryolite C. treating cryolite with sodium hydroxide solution under prressure D. heating sodium aluminium silicate to a high temperature |
B |
| 20. |
Given the reactions (i) Fe(s) + X(NO3)2(aq) → Fe(NO3) + X(s) (ii) H2(g) + XO A. copper B. zinc C. calcium D. lead |
A |
| 11. |
Which of the following will produce the greatest increase in the rate of the chemical reaction represented by the equation Na2S2O3(aq) + 2HCl(aq) → 2NaCI(aq) + H2O(I) + SO2(g) + S(g)? A. A decrease in temperature and an increase in the concentration of the reactants B. An increase in the temperature and a decrease in the cocentration of the reactants C. An increase in temperature and an increase in the concentration of the reactants D. A decrease in the temperature and a decrease in the concentration of the reactants |
C |
| 12. |
Which of the followingstatements is TRUE? A. The dissolution of NaOH(s) in water is endothermic B. The heat os solution of NaOH(s) is positive C. The NaOH(s) gains heat from the surroundings D. The heat of solution of NaOH(s) is negative |
D |
| 13. |
Which property of a reversible reaction is affected by a catalyst? A. Heat content (enthalphy) B. Energy of activation C. Free energy change D. Equilibrium position |
B |
| 14. |
Which of the following is used in fire extinguishers? A. Carbon (ll) oxide B. Carbon (lV) oxide C. Sulphur (lV) oxide D. Ammonia |
B |
| 15. |
When H2S gas is passed into a solution of iron (III) chloride, the colour changes from yellow to green. This is because? A. H(s)S is reduced to S B. Fe3+ ions are oxidized by H(s)S C. Fe3+ ions are oxidized Fe3+ ions D. Fe3+ ions are reduced to Fe2+ ions |
D |
| 16. |
Suitable reagents for the laboratory preparation nitrogen are? A. sodium dioxonitrate (III) and ammonium chloride B. sodium dioxonitrate (V) and ammonium chloride C. sodium chloride and ammonium chloride D. sodium chloride and ammonium diozonitrate (III) |
A |
| 17. |
The thermal decomposition of copper (ll)trioxonitrate (V) yields copper (ll) oxide, oxygen and? A. nitrogen (ll) oxide B. nitrogen (l) oxide C. nitrogen (lV) oxide D. nitrogen |
C |
| 18. |
Chlorine is produced commmercially by? A. electrolysis of dilute hydrochloric acid B. electrolysis of brine C. neutralization of hydrogen chloride D. heating potassium trioxochlorate (V) |
B |
| 19. |
Aluminium is extracted commercially from its ore by? A. heating aluminium oxide with coke in a furance B. the electrolysis of fused aluminium oxide in cryolite C. treating cryolite with sodium hydroxide solution under prressure D. heating sodium aluminium silicate to a high temperature |
B |
| 20. |
Given the reactions (i) Fe(s) + X(NO3)2(aq) → Fe(NO3) + X(s) (ii) H2(g) + XO A. copper B. zinc C. calcium D. lead |
A |