Year :
1980
Title :
Chemistry
Exam :
JAMB Exam
Paper 1 | Objectives
21 - 30 of 47 Questions
| # | Question | Ans |
|---|---|---|
| 21. |
When dilute hydrochloric acid is added to iron(ll)sulphide, the gas evolved will? A. turn moist red litmus paper blue B. turn lime water milky C. blacken lead acurate paper D. rekindle a glowing splint E. burn a sqeakly pop |
C |
| 22. |
In which of the following is the oxidation state of oxygen different from its value in water? A. OH- B. H3O+ C. O- D. H2O2 E. SO2 |
D |
| 23. |
Which of the following silver halides is readily soluble in ammonium hydroxide? A. Agl B. AgBr C. AgCl D. AgF E. None of the above |
C |
| 24. |
The chemical reaction which takes place at the anode (positive electrode) in electrolysis is? A. oxidation B. hydrolysis C. dissociation D. reduction E. disproportionation |
A |
| 25. |
Which of the following does NOT happen when a zinc rod is introduced into a solution of copper (ll) sulphate? A. Electrons flow towards the zinc rod B. The zinc rod dissolves C. The temperature of the soil changes D. The blue colour of the solution gradually disappears E. Copper metal is deposited |
A |
| 26. |
Hardening of an oil may be achieved by? A. boiling the oil with water B. boiling the oil with a catalyst C. treating the oil with sodium hydroxide D. treating the oil with hydrogen and catalyst E. distilling oil under reduced pressure |
D |
| 27. |
Hardening of an oil may achieved by? A. boiling the oil with water B. boiling the oil with a catalyst C. treating the oil with sodium hydroxide D. treating the oil with hydrogen and catalyst E. distilling oil under reduced pressure |
D |
| 28. |
A cold aqueous solution of sodium chloride is electrolyzed using a graphite anode and an iron cathode. In the course of the electrolysis the electrolyte is continuously stirred. The liquid left after electrolysis will therefore consist of? A. sodium hydroxide solution B. chlorine water C. pure water D. sodium hypochlorite solution E. hydrochloric acid solution |
B |
| 29. |
The best way of collecting chlorine is? A. by downward displacement of air B. by upward displacement of air C. over water D. under water E. over mercury Detailed SolutionChlorine gas is 2.5 times denser than air, hence it is best collected by the downward delivery or upward displacement of air. |
|
| 30. |
Cellulose and starches can be classified as one of the following? A. sugars B. sucrose C. hydrocarbons D. carbohydrates E. isomers |
D |
| 21. |
When dilute hydrochloric acid is added to iron(ll)sulphide, the gas evolved will? A. turn moist red litmus paper blue B. turn lime water milky C. blacken lead acurate paper D. rekindle a glowing splint E. burn a sqeakly pop |
C |
| 22. |
In which of the following is the oxidation state of oxygen different from its value in water? A. OH- B. H3O+ C. O- D. H2O2 E. SO2 |
D |
| 23. |
Which of the following silver halides is readily soluble in ammonium hydroxide? A. Agl B. AgBr C. AgCl D. AgF E. None of the above |
C |
| 24. |
The chemical reaction which takes place at the anode (positive electrode) in electrolysis is? A. oxidation B. hydrolysis C. dissociation D. reduction E. disproportionation |
A |
| 25. |
Which of the following does NOT happen when a zinc rod is introduced into a solution of copper (ll) sulphate? A. Electrons flow towards the zinc rod B. The zinc rod dissolves C. The temperature of the soil changes D. The blue colour of the solution gradually disappears E. Copper metal is deposited |
A |
| 26. |
Hardening of an oil may be achieved by? A. boiling the oil with water B. boiling the oil with a catalyst C. treating the oil with sodium hydroxide D. treating the oil with hydrogen and catalyst E. distilling oil under reduced pressure |
D |
| 27. |
Hardening of an oil may achieved by? A. boiling the oil with water B. boiling the oil with a catalyst C. treating the oil with sodium hydroxide D. treating the oil with hydrogen and catalyst E. distilling oil under reduced pressure |
D |
| 28. |
A cold aqueous solution of sodium chloride is electrolyzed using a graphite anode and an iron cathode. In the course of the electrolysis the electrolyte is continuously stirred. The liquid left after electrolysis will therefore consist of? A. sodium hydroxide solution B. chlorine water C. pure water D. sodium hypochlorite solution E. hydrochloric acid solution |
B |
| 29. |
The best way of collecting chlorine is? A. by downward displacement of air B. by upward displacement of air C. over water D. under water E. over mercury Detailed SolutionChlorine gas is 2.5 times denser than air, hence it is best collected by the downward delivery or upward displacement of air. |
|
| 30. |
Cellulose and starches can be classified as one of the following? A. sugars B. sucrose C. hydrocarbons D. carbohydrates E. isomers |
D |