Year :
2008
Title :
Chemistry
Exam :
JAMB Exam
Paper 1 | Objectives
21 - 30 of 49 Questions
| # | Question | Ans |
|---|---|---|
| 21. |
Insoluble salts can be prepared by A. titrating an alkali against an appropriate acid B. reacting an acid with trioxocarbonatr (IV) salt C. directing combination of the elements which make up the salt D. mixing two soluble compounds containing the metallic radical and the acidic radical Detailed SolutionTwo soluble metal salts react with each other to form one soluble salt and one insoluble salt . Lead nitrate solution and sodium chloride solution react to produce solid lead chloride , leaving soluble sodium nitrate in solution. The lead chloride can be recovered by filtration. |
|
| 22. |
The oxidation state of carbon in HCOOH is A. -1 B. +2 C. +3 D. zero Detailed SolutionHCOOHO.N of H + O.N of C + 2* O.N of oxygen of H = 0 1 + X + 2X - 2 + 1 = 0 2 + X -4 = 0 X = 4 - 2 = +2 |
|
| 23. |
What is the IUPAC nomenclature of the compound NaCIO? A. sodium oxochlorate (I) B. sodium chloro (I) oxide C. sodium monooxochlorate (II) D. sodium chloro (I) monoxide |
A |
| 24. |
In recharging a lead-acid accumulator, the reaction at the cathode can be represented as A. Pb2+(aq) + SO2-4(aq) →PbSO4(s) B. Pb2+(aq) + 2e- →Pb(s) C. Pb2+(aq) + 2H2O(l) → PbO2(s) + 4H+(aq) + 4e- D. Pb(s) → Pb2+(aq) + 2e- |
D |
| 25. |
If a given quantity of electricity liberates 0.65g of Zn2+, what amount of Hg2+ would be liberated by the same quantity of current? A. 1.00g B. 2.10g C. 4.02g D. 8.04g |
B |
| 26. |
NH3(g) + HCl(s) → NH4Cl(s) A. positive B. zero C. negative D. indeterminate |
C |
| 27. |
Which of the following reaction is endothermic? A. C(s) + O2(g) → CO2(g) B. CaO(s) + H2O(l) → Ca(OH)2(s) C. C(s) + H2O(g) → CO(g) + H2(g) D. HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l) |
C |
| 28. |
A catalyst speeds up the rate of chemical reaction by A. taking part in the reaction B. increasing the activation energy of the reaction C. lowering the activation energy of the reaction D. increasing the heat content |
C |
| 29. |
The rate of a reaction usually decrease in the concentration of reactants because A. kinetic energy decrease B. temperature increase C. speed increases D. reactants collision decrease |
D |
| 30. |
The substance that is used in the steel industry for the removal of carbon, sulphur and phosphorus impurities from pig iron is A. oxygen B. chlorine C. nitrogen D. hydrogen |
A |
| 21. |
Insoluble salts can be prepared by A. titrating an alkali against an appropriate acid B. reacting an acid with trioxocarbonatr (IV) salt C. directing combination of the elements which make up the salt D. mixing two soluble compounds containing the metallic radical and the acidic radical Detailed SolutionTwo soluble metal salts react with each other to form one soluble salt and one insoluble salt . Lead nitrate solution and sodium chloride solution react to produce solid lead chloride , leaving soluble sodium nitrate in solution. The lead chloride can be recovered by filtration. |
|
| 22. |
The oxidation state of carbon in HCOOH is A. -1 B. +2 C. +3 D. zero Detailed SolutionHCOOHO.N of H + O.N of C + 2* O.N of oxygen of H = 0 1 + X + 2X - 2 + 1 = 0 2 + X -4 = 0 X = 4 - 2 = +2 |
|
| 23. |
What is the IUPAC nomenclature of the compound NaCIO? A. sodium oxochlorate (I) B. sodium chloro (I) oxide C. sodium monooxochlorate (II) D. sodium chloro (I) monoxide |
A |
| 24. |
In recharging a lead-acid accumulator, the reaction at the cathode can be represented as A. Pb2+(aq) + SO2-4(aq) →PbSO4(s) B. Pb2+(aq) + 2e- →Pb(s) C. Pb2+(aq) + 2H2O(l) → PbO2(s) + 4H+(aq) + 4e- D. Pb(s) → Pb2+(aq) + 2e- |
D |
| 25. |
If a given quantity of electricity liberates 0.65g of Zn2+, what amount of Hg2+ would be liberated by the same quantity of current? A. 1.00g B. 2.10g C. 4.02g D. 8.04g |
B |
| 26. |
NH3(g) + HCl(s) → NH4Cl(s) A. positive B. zero C. negative D. indeterminate |
C |
| 27. |
Which of the following reaction is endothermic? A. C(s) + O2(g) → CO2(g) B. CaO(s) + H2O(l) → Ca(OH)2(s) C. C(s) + H2O(g) → CO(g) + H2(g) D. HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l) |
C |
| 28. |
A catalyst speeds up the rate of chemical reaction by A. taking part in the reaction B. increasing the activation energy of the reaction C. lowering the activation energy of the reaction D. increasing the heat content |
C |
| 29. |
The rate of a reaction usually decrease in the concentration of reactants because A. kinetic energy decrease B. temperature increase C. speed increases D. reactants collision decrease |
D |
| 30. |
The substance that is used in the steel industry for the removal of carbon, sulphur and phosphorus impurities from pig iron is A. oxygen B. chlorine C. nitrogen D. hydrogen |
A |