Year :
1995
Title :
Chemistry
Exam :
JAMB Exam
Paper 1 | Objectives
11 - 20 of 45 Questions
| # | Question | Ans |
|---|---|---|
| 11. |
Which of the following statements is FALSE about isotopes of the same element? A. They have the same number of electrons in their outermost shells B. They have different atomic masses C. They have the same atomic number and the number of electrons D. They have the same atomic number but different umber of elelctrons |
D |
| 12. |
Helium is often used in observation balloons because it is? A. light and combustible B. light and non-combustible C. heavy and combustible D. heavy and non-combustible |
B |
| 13. |
Deliquescent substances are also? A. efflorescent B. anhydrous C. hygroscopic D. insoluble |
C |
| 14. |
When plastics and packaging materials made from chloroethene are burnt in the open, the mixture of gases released into the atmosphere is most likely to contain? A. ethane B. chlorine C. hydrogen chloride D. ethene |
C |
| 15. |
The difference between colloides and and suspensions is brought out clearly by the fact that while colloids? A. do not scatter light, suspensions do B. can be separated by filtration, suspension cannot be so separated C. can be separated by a membrane, suspensions cannot D. do not settle out on standing, suspensions do |
D |
| 16. |
In general, an increase in temperature increases the solubility of a solute in water because? A. more solute molecules collide with each other B. most solutes dissolve with the evoltion of heat C. more solute molecules dissociate at hihger temperatures D. most solutes dissolve with absorption of heat |
D |
| 17. |
Neutralization involves a reaction between H3O+ and? A. CI- B. OH- C. NO3- D. CO32- |
B |
| 18. |
In the process of silver-plating a metal M, the metal M is the? A. anode and a direct current is used B. cathode and an alternating current is used C. anode and an alternating current is used D. cathode and a direct current is used Detailed SolutionPlating requires ions to flow through an electrolyte in an electric field. Positive ions flow with the electric field, negative ions against the electric field. This electric field comes from a DC supply connected to the electrodes. While silver plating, Ag is the anode while the metal to be coated is the cathode. |
|
| 19. |
How many moles of copper would be deposited by passing 3F of electricity through a solution of copper (II) tetraoxosulpohate (IV)? A. 0.5 B. 1.0 C. 1.5 D. 3.0 |
C |
| 20. |
2CL-(aq) → CI2(g) + 2e-(aq). The above half-cell reaction occuring at the anode during the electrolysis of dilute ZnCI2 solution is? A. ionization B. oxidation C. reduction D. recombination |
B |
| 11. |
Which of the following statements is FALSE about isotopes of the same element? A. They have the same number of electrons in their outermost shells B. They have different atomic masses C. They have the same atomic number and the number of electrons D. They have the same atomic number but different umber of elelctrons |
D |
| 12. |
Helium is often used in observation balloons because it is? A. light and combustible B. light and non-combustible C. heavy and combustible D. heavy and non-combustible |
B |
| 13. |
Deliquescent substances are also? A. efflorescent B. anhydrous C. hygroscopic D. insoluble |
C |
| 14. |
When plastics and packaging materials made from chloroethene are burnt in the open, the mixture of gases released into the atmosphere is most likely to contain? A. ethane B. chlorine C. hydrogen chloride D. ethene |
C |
| 15. |
The difference between colloides and and suspensions is brought out clearly by the fact that while colloids? A. do not scatter light, suspensions do B. can be separated by filtration, suspension cannot be so separated C. can be separated by a membrane, suspensions cannot D. do not settle out on standing, suspensions do |
D |
| 16. |
In general, an increase in temperature increases the solubility of a solute in water because? A. more solute molecules collide with each other B. most solutes dissolve with the evoltion of heat C. more solute molecules dissociate at hihger temperatures D. most solutes dissolve with absorption of heat |
D |
| 17. |
Neutralization involves a reaction between H3O+ and? A. CI- B. OH- C. NO3- D. CO32- |
B |
| 18. |
In the process of silver-plating a metal M, the metal M is the? A. anode and a direct current is used B. cathode and an alternating current is used C. anode and an alternating current is used D. cathode and a direct current is used Detailed SolutionPlating requires ions to flow through an electrolyte in an electric field. Positive ions flow with the electric field, negative ions against the electric field. This electric field comes from a DC supply connected to the electrodes. While silver plating, Ag is the anode while the metal to be coated is the cathode. |
|
| 19. |
How many moles of copper would be deposited by passing 3F of electricity through a solution of copper (II) tetraoxosulpohate (IV)? A. 0.5 B. 1.0 C. 1.5 D. 3.0 |
C |
| 20. |
2CL-(aq) → CI2(g) + 2e-(aq). The above half-cell reaction occuring at the anode during the electrolysis of dilute ZnCI2 solution is? A. ionization B. oxidation C. reduction D. recombination |
B |