Year :
1994
Title :
Chemistry
Exam :
JAMB Exam
Paper 1 | Objectives
21 - 30 of 52 Questions
| # | Question | Ans |
|---|---|---|
| 21. |
What volume of oxygen measured at s.t.p would be liberated on electrolysis by 9650 coulombs of electricity? A. 22.4 dm3 B. 11.2 dm3 C. 1.12 dm3 D. 0.560 dm3 Detailed SolutionFor a diatomic divalent element like oxygen:4 faraday (4 * 96,500) = 1 mole of the element = Molar volume of gas = 22.4 : 4 * 96,500 = 22.4 9650 = x : x = \(\frac{9650 * 22.4}{ 4 * 96,500}\) x = 0.56dm\(^3\) |
|
| 22. |
Crude copper could be purified by the electrolysis of concentrated copper (II) chloride if the crude copper is? A. made both the anode and the cathode B. made the cathode C. made the anode D. dissolved in the solution |
C |
| 23. |
H- + H2(I)O → H2(g) + OH-(aq). From the equation above, it can be inferred that the? A. reaction is a double decomposition B. hydride ion is a reducing agent C. hydride ion is an oxidizing agent D. reaction is neutralization |
B |
| 24. |
An anhydride is an oxide of non-mental? A. which will not dissolve in water B. whose solution in water has a pH greater than 7 C. whose solution in water has a pH less than 7 D. whose solution in water has a pH of 7 |
C |
| 25. |
MnO4(aq) + 8H + (aq) + 5Fe2+ → Mn2+(aq) + 4H2O(I). The oxidation number of manganese in the above reaction changed from? A. +7 to +2 B. +6 to +2 C. +5 to +2 D. +4 to +2 |
A |
| 26. |
Which of the following is TRUE of Le Chatelier's Principle for an exothermic reaction? A. Increase in temperature will cause an increase in the equilibrium constant B. Increase in temperature will cause a decrease in the equilibrium constant C. Addition of a catalyst will cause an increase in the equilibrium constant D. Addition of a catalyst will cause a decrease in the equilibrium constant |
B |
| 27. |
Which of the following are produced when ammonium trioxonitrate (V) crystals are cautiously heated in a hard glass round bottomed flask? A. N2O and steam B. NO2 and ammonia C. N2O2 and NO2 D. NO and NO2 |
A |
| 28. |
Which of these metals CANNOT replace hydrogen from alkaline solutions? A. Alulinium B. Zinc C. Tin D. Iron |
D |
| 29. |
Clothes should be properly rinsed with water after bleaching because? A. the bleach decolourizes the cothes B. chlorine reacts with fabrics during bleaching C. the clothes are sterilized during bleaching D. hydrogen chloride solution is produced during bleaching |
D |
| 30. |
Which of these solutions will give a white precipitate with a solution of barium chloride acidified with hydrochloric acid? A. Sodium trioxocarbonate (IV) B. Sodium tetraoxosulphate (IV) C. Sodium trioxosulphate (IV) D. Sodium sulphide Detailed SolutionThe characteristic test for any soluble tetraoxosulphate(VI) is the formation of white precipitate (barium sulphate) when a solution of barium chloride, acidified with dilute HCl, or when a solution of barium nitrate, acidified with dilute nitric acid is reacted with it. |
| 21. |
What volume of oxygen measured at s.t.p would be liberated on electrolysis by 9650 coulombs of electricity? A. 22.4 dm3 B. 11.2 dm3 C. 1.12 dm3 D. 0.560 dm3 Detailed SolutionFor a diatomic divalent element like oxygen:4 faraday (4 * 96,500) = 1 mole of the element = Molar volume of gas = 22.4 : 4 * 96,500 = 22.4 9650 = x : x = \(\frac{9650 * 22.4}{ 4 * 96,500}\) x = 0.56dm\(^3\) |
|
| 22. |
Crude copper could be purified by the electrolysis of concentrated copper (II) chloride if the crude copper is? A. made both the anode and the cathode B. made the cathode C. made the anode D. dissolved in the solution |
C |
| 23. |
H- + H2(I)O → H2(g) + OH-(aq). From the equation above, it can be inferred that the? A. reaction is a double decomposition B. hydride ion is a reducing agent C. hydride ion is an oxidizing agent D. reaction is neutralization |
B |
| 24. |
An anhydride is an oxide of non-mental? A. which will not dissolve in water B. whose solution in water has a pH greater than 7 C. whose solution in water has a pH less than 7 D. whose solution in water has a pH of 7 |
C |
| 25. |
MnO4(aq) + 8H + (aq) + 5Fe2+ → Mn2+(aq) + 4H2O(I). The oxidation number of manganese in the above reaction changed from? A. +7 to +2 B. +6 to +2 C. +5 to +2 D. +4 to +2 |
A |
| 26. |
Which of the following is TRUE of Le Chatelier's Principle for an exothermic reaction? A. Increase in temperature will cause an increase in the equilibrium constant B. Increase in temperature will cause a decrease in the equilibrium constant C. Addition of a catalyst will cause an increase in the equilibrium constant D. Addition of a catalyst will cause a decrease in the equilibrium constant |
B |
| 27. |
Which of the following are produced when ammonium trioxonitrate (V) crystals are cautiously heated in a hard glass round bottomed flask? A. N2O and steam B. NO2 and ammonia C. N2O2 and NO2 D. NO and NO2 |
A |
| 28. |
Which of these metals CANNOT replace hydrogen from alkaline solutions? A. Alulinium B. Zinc C. Tin D. Iron |
D |
| 29. |
Clothes should be properly rinsed with water after bleaching because? A. the bleach decolourizes the cothes B. chlorine reacts with fabrics during bleaching C. the clothes are sterilized during bleaching D. hydrogen chloride solution is produced during bleaching |
D |
| 30. |
Which of these solutions will give a white precipitate with a solution of barium chloride acidified with hydrochloric acid? A. Sodium trioxocarbonate (IV) B. Sodium tetraoxosulphate (IV) C. Sodium trioxosulphate (IV) D. Sodium sulphide Detailed SolutionThe characteristic test for any soluble tetraoxosulphate(VI) is the formation of white precipitate (barium sulphate) when a solution of barium chloride, acidified with dilute HCl, or when a solution of barium nitrate, acidified with dilute nitric acid is reacted with it. |