Year :
1986
Title :
Chemistry
Exam :
JAMB Exam
Paper 1 | Objectives
1 - 10 of 47 Questions
| # | Question | Ans |
|---|---|---|
| 1. |
Which of the following salts when dissolved in water will NOT give the corresponding pH value? A. NaHSO4, pH < 5 B. Na2CO3, pH > 8 C. Na2Cl,pH = 7 D. NaHCO |
D |
| 2. |
Which of the following is an acidic salt? A. NaHSO4 B. Na2SO4 C. CH3CO2Na D. Na2S |
A |
| 3. |
Which of the following solutions will conduct the least amount of electricity? A. 2.00 M aqueous solution of NaOH B. 0.01 M aqueous solution of NaOH C. 0.01 M aqueous solution of hexanoic acid D. 0.01 M aqueous solution of sugar |
D |
| 4. |
How many coulombs of electricity are passed through a solution in which 6.5 amperes are allowed to run for 1.0 hour? A. 3.90 x 102 coulombs B. 5.50 x 103 coulombs C. 6.54 x 103 coulombs D. 2.34 x 104 coulombs |
D |
| 5. |
Which of these represents a redox reaction? A. AgNO3 + NaCl → AgCAl + NaNO3 B. H2S + Pb(NO3) → PbS + 2HNO3 C. CaCO3 → CaO + CO2 D. Zn + 2HCl → ZnCl2 + H2 |
D |
| 6. |
20 cm3 of 1.0 molar NH4OH solution when neutralized with 20.05cm3 of 0.1 molar HCl liberated -102 joules of heat. Calculate the heat of neutralization of NH4OH? A. -51.O KJ mol- B. +57.3 KJ mol- C. +57.O KJ mol- D. +51.0 KJ mol- Detailed SolutionNH4OH = 20cm of 0.1 mNH4 + HCl → NH4Cl = H2O Heat of Neutralization of NH4OH = \(\frac{-102}{2}\) = -51.0 KJ mole-1 |
|
| 7. |
What is the consequences of increasing pressure on the equilibrium reaction ZnO(s) + H2(g) Zn(s) + H2O(I)? A. The equilibrium is driven to the left B. The equilibrium is driven to the right C. There is no effect D. More ZnO is produced |
C |
| 8. |
The approximate volume of air containing 10cm3 of oxygen is? A. 20 cm3 B. 25 cm3 C. 50 cm3 D. 100 cm3 Detailed SolutionVolume of air containing 10 cm O2 is(100 x 10)/(20) = 50cm3 |
|
| 9. |
The reaction Mg + H2O → MgO + H2 takes place only in the presence of? A. excess Mg ribbon B. excess cold water C. very hot water D. steam |
D |
| 10. |
When steam is passed through red hot carbon, which of the following are produced? A. Hydrogen oxygen and carbon (IV) oxide B. Hydrogen and carbon (IV) oxide C. Hydrogen and carbon (II) oxide D. Hydrogen and trioxocarbonate (IV) acid |
C |
| 1. |
Which of the following salts when dissolved in water will NOT give the corresponding pH value? A. NaHSO4, pH < 5 B. Na2CO3, pH > 8 C. Na2Cl,pH = 7 D. NaHCO |
D |
| 2. |
Which of the following is an acidic salt? A. NaHSO4 B. Na2SO4 C. CH3CO2Na D. Na2S |
A |
| 3. |
Which of the following solutions will conduct the least amount of electricity? A. 2.00 M aqueous solution of NaOH B. 0.01 M aqueous solution of NaOH C. 0.01 M aqueous solution of hexanoic acid D. 0.01 M aqueous solution of sugar |
D |
| 4. |
How many coulombs of electricity are passed through a solution in which 6.5 amperes are allowed to run for 1.0 hour? A. 3.90 x 102 coulombs B. 5.50 x 103 coulombs C. 6.54 x 103 coulombs D. 2.34 x 104 coulombs |
D |
| 5. |
Which of these represents a redox reaction? A. AgNO3 + NaCl → AgCAl + NaNO3 B. H2S + Pb(NO3) → PbS + 2HNO3 C. CaCO3 → CaO + CO2 D. Zn + 2HCl → ZnCl2 + H2 |
D |
| 6. |
20 cm3 of 1.0 molar NH4OH solution when neutralized with 20.05cm3 of 0.1 molar HCl liberated -102 joules of heat. Calculate the heat of neutralization of NH4OH? A. -51.O KJ mol- B. +57.3 KJ mol- C. +57.O KJ mol- D. +51.0 KJ mol- Detailed SolutionNH4OH = 20cm of 0.1 mNH4 + HCl → NH4Cl = H2O Heat of Neutralization of NH4OH = \(\frac{-102}{2}\) = -51.0 KJ mole-1 |
|
| 7. |
What is the consequences of increasing pressure on the equilibrium reaction ZnO(s) + H2(g) Zn(s) + H2O(I)? A. The equilibrium is driven to the left B. The equilibrium is driven to the right C. There is no effect D. More ZnO is produced |
C |
| 8. |
The approximate volume of air containing 10cm3 of oxygen is? A. 20 cm3 B. 25 cm3 C. 50 cm3 D. 100 cm3 Detailed SolutionVolume of air containing 10 cm O2 is(100 x 10)/(20) = 50cm3 |
|
| 9. |
The reaction Mg + H2O → MgO + H2 takes place only in the presence of? A. excess Mg ribbon B. excess cold water C. very hot water D. steam |
D |
| 10. |
When steam is passed through red hot carbon, which of the following are produced? A. Hydrogen oxygen and carbon (IV) oxide B. Hydrogen and carbon (IV) oxide C. Hydrogen and carbon (II) oxide D. Hydrogen and trioxocarbonate (IV) acid |
C |