Year :
1984
Title :
Chemistry
Exam :
JAMB Exam
Paper 1 | Objectives
11 - 20 of 45 Questions
| # | Question | Ans |
|---|---|---|
| 11. |
For the reaction 2Fe3+ 2I- \(\to\) 2Fe2+ + I2, which of the following statements is TRUE? A. Fe is oxidized to Fe3+ B. Fe3+ is oxidized to Fe2+ C. I- is oxidized to I2 D. I- is reduced to I2 E. I- is displacing an electron from Fe3+ |
C |
| 12. |
In dilute solution the heat of the reaction NaOH + HCl = NaCl + H2O is - 57.3kJ. Therefore the heat of the reaction 2NaOH + H2SO4 \(\to\) Na2SO4 + 2H2O is A. + 28.65 kJ B. - 28.65KJ C. + 57.3KJ D. - 114.6 KJ E. - 229.2 KJ Detailed SolutionNaOH + HCl = NaCl + H2O \(\Delta\)H = -57.3kJHeat of reaction of 2NaOH + H2O4 NaSO4 + H2O is = 57.3 x 2 = -114.6 kJ |
|
| 13. |
Which of the following methods may be used to prepare trioxonitrate (V) acid (nitric acid) in the laboratory? A. Heating ammonia gas with tetraoxosulphate (VI) acid B. Heating ammonium trioxonitrate (V) with tetraoxosulphate (VI) acid C. Heating sodium trioxonitrate (V) with tetraoxosulphate (VI) acid D. Heating potassium trioxonitrate (V) with calcium hydroxide E. Heating a mixture of ammonia gas and oxygen. |
C |
| 14. |
Lime - water, which is used in the laboratory for the detection of carbon(iv)oxide is an aqueous solution of A. Ca(OH)2 B. CaCO3 C. CaHCO3 D. CaSO4 E. N2CO3 |
A |
| 15. |
An element that can exist in two or more different structural forms which possess the same chemical properties is said to exhibit. A. polymerism B. isotopy C. isomorphism D. isomerism E. allotrophy Detailed SolutionAllotropy or allotropism is the property of some chemical elements to exist in two or more different forms, in the same physical state, known as allotropes of these elements. |
|
| 16. |
Sulphur A. forms two alkaline oxides B. is spontaneously flammable C. burns with a blue flame D. conducts electricity in the molten state E. is usually stored in the form of sicks in water |
C |
| 17. |
Which of the following statements is NOT true of carbon monoxide? A. CO is poisonous B. CO is readily oxidized at room temperature by air to form CO2 C. CO may be prepared by reducing CO2 mixed with coke heated to about 1000oC D. CO may be prepared by heating charcoal with a limited amount of O2 E. CO is a good reducing agent |
B |
| 18. |
From the reactions : ZnO + Na2O \(\to\) NaZnO and ZnO + CO2 \(\to\) ZnCO3 it may be concluded that zinc oxide is A. neutral B. basic C. acidic D. amphoteric E. a mixture |
D |
| 19. |
An example of a neutral oxide is A. AL2O3 B. NO2 C. CO2 D. CO E. SO2 |
D |
| 20. |
3Cl2 + 2NH3 \(\to\) N2 + 6HCl. In the above reaction, ammonia acts as A. a reducing agent B. an oxidizing agent C. an acid D. a catalyst E. a dry agent |
A |
| 11. |
For the reaction 2Fe3+ 2I- \(\to\) 2Fe2+ + I2, which of the following statements is TRUE? A. Fe is oxidized to Fe3+ B. Fe3+ is oxidized to Fe2+ C. I- is oxidized to I2 D. I- is reduced to I2 E. I- is displacing an electron from Fe3+ |
C |
| 12. |
In dilute solution the heat of the reaction NaOH + HCl = NaCl + H2O is - 57.3kJ. Therefore the heat of the reaction 2NaOH + H2SO4 \(\to\) Na2SO4 + 2H2O is A. + 28.65 kJ B. - 28.65KJ C. + 57.3KJ D. - 114.6 KJ E. - 229.2 KJ Detailed SolutionNaOH + HCl = NaCl + H2O \(\Delta\)H = -57.3kJHeat of reaction of 2NaOH + H2O4 NaSO4 + H2O is = 57.3 x 2 = -114.6 kJ |
|
| 13. |
Which of the following methods may be used to prepare trioxonitrate (V) acid (nitric acid) in the laboratory? A. Heating ammonia gas with tetraoxosulphate (VI) acid B. Heating ammonium trioxonitrate (V) with tetraoxosulphate (VI) acid C. Heating sodium trioxonitrate (V) with tetraoxosulphate (VI) acid D. Heating potassium trioxonitrate (V) with calcium hydroxide E. Heating a mixture of ammonia gas and oxygen. |
C |
| 14. |
Lime - water, which is used in the laboratory for the detection of carbon(iv)oxide is an aqueous solution of A. Ca(OH)2 B. CaCO3 C. CaHCO3 D. CaSO4 E. N2CO3 |
A |
| 15. |
An element that can exist in two or more different structural forms which possess the same chemical properties is said to exhibit. A. polymerism B. isotopy C. isomorphism D. isomerism E. allotrophy Detailed SolutionAllotropy or allotropism is the property of some chemical elements to exist in two or more different forms, in the same physical state, known as allotropes of these elements. |
| 16. |
Sulphur A. forms two alkaline oxides B. is spontaneously flammable C. burns with a blue flame D. conducts electricity in the molten state E. is usually stored in the form of sicks in water |
C |
| 17. |
Which of the following statements is NOT true of carbon monoxide? A. CO is poisonous B. CO is readily oxidized at room temperature by air to form CO2 C. CO may be prepared by reducing CO2 mixed with coke heated to about 1000oC D. CO may be prepared by heating charcoal with a limited amount of O2 E. CO is a good reducing agent |
B |
| 18. |
From the reactions : ZnO + Na2O \(\to\) NaZnO and ZnO + CO2 \(\to\) ZnCO3 it may be concluded that zinc oxide is A. neutral B. basic C. acidic D. amphoteric E. a mixture |
D |
| 19. |
An example of a neutral oxide is A. AL2O3 B. NO2 C. CO2 D. CO E. SO2 |
D |
| 20. |
3Cl2 + 2NH3 \(\to\) N2 + 6HCl. In the above reaction, ammonia acts as A. a reducing agent B. an oxidizing agent C. an acid D. a catalyst E. a dry agent |
A |