Year :
1991
Title :
Chemistry
Exam :
JAMB Exam
Paper 1 | Objectives
11 - 20 of 49 Questions
| # | Question | Ans |
|---|---|---|
| 11. |
The ions X- and Y+ are isoelectronic, each containing a total of 10 electrons. A. 10 and 10 B. 9 and 9 C. 11 and 9 D. 9 and 11 Detailed SolutionX- means one excess electron, hence 9 protons while Y +/- means one deficit electron hence 11 protons X and Y = 9 and 11 |
|
| 12. |
Which of the following represents the type of bonding present in ammonium chloride molecule? A. Ionic only B. Covalent only C. Ionic and dative covalent D. Dative covalent only |
C |
| 13. |
Which of the following is arranged in order of increasing electronegativity? A. Chlorine, aluminium, magnesium, phosphorus, sodium B. sodium, magnesium, aluminium, phosphorus, chlorine C. Chlorine, phosphorus, phosphorous, aluminium, magnesium, sodium D. Sodium, chlorine, phosphorus, magnesium, aluminium |
B |
| 14. |
A quantity of air was passed through a weighed amount of alkaline pyrogallol. An increase in the weight of the pyrogallol would result from the absorption of? A. nitrogen B. neon C. argon D. oxygen Detailed SolutionAlkaline pyrogallol absorbs 92 |
|
| 15. |
Which of the following ions is a pollutant in drinking water even in trace amounts? A. Ca2+ B. Hg2+ C. Mg2+ D. Fe2+ |
B |
| 16. |
The solubility of copper (II) tetraoxosulphate (Iv) is 75g in 100g of water at 100°C and 25g in 100g of water at 30°C. What mass of the salt would crystallize, if 50g of copper (II) tetraoxosulphate (VI) solution saturated at 100°C were cooled to 30°C ? A. 57.5 B. 42.2 C. 28.6 D. 14.3 Detailed Solutionsolute + solvent = solutionat 100oC; 75g + 100g = 175g at30oC; \(\frac{25g}{50g}\) + 100g = 125g From 100oC - 30oC; 175g CuSO4 ppt 50g From 100oC - 30oC; 50g CuSO4 ppt \(\frac{50 \times 50}{175}\) = 14.3 |
|
| 17. |
A sample of temporary hard water can be prepared in the laboratory by? A. disolving calcium chloride in distilled water B. saturating lime water with carbon (IV) oxide C. saturating distilled water with calcium hydroxide D. dissolving sodium hydrogen trioxocarbonate (IV) in some distilled water |
B |
| 18. |
A property of a colloidal dispersion which a solution does not have is? A. the Tyndall effect B. homogeneity C. osmotic pressure D. surface polarity |
A |
| 19. |
50 cm3 of sulphur (IV) oxide, 800 cm3 of ammonia, 450 cm3 of hydrogen chloride, 1.0 cm3 of at 15°C. Which of the following is suitable for demonstrating the fountain experiment? A. Sulphur (IV) oxide hydrogen chloride B. Carbon (IV) oxide and amonia C. Amonia and hydrogen chloride D. Carbon (IV) oxide and surphur (IV) oxide |
C |
| 20. |
How many structural isomers can be written for the alkyl bromide, C4H9Br? A. 3 B. 4 C. 6 D. 8 |
B |
| 11. |
The ions X- and Y+ are isoelectronic, each containing a total of 10 electrons. A. 10 and 10 B. 9 and 9 C. 11 and 9 D. 9 and 11 Detailed SolutionX- means one excess electron, hence 9 protons while Y +/- means one deficit electron hence 11 protons X and Y = 9 and 11 |
|
| 12. |
Which of the following represents the type of bonding present in ammonium chloride molecule? A. Ionic only B. Covalent only C. Ionic and dative covalent D. Dative covalent only |
C |
| 13. |
Which of the following is arranged in order of increasing electronegativity? A. Chlorine, aluminium, magnesium, phosphorus, sodium B. sodium, magnesium, aluminium, phosphorus, chlorine C. Chlorine, phosphorus, phosphorous, aluminium, magnesium, sodium D. Sodium, chlorine, phosphorus, magnesium, aluminium |
B |
| 14. |
A quantity of air was passed through a weighed amount of alkaline pyrogallol. An increase in the weight of the pyrogallol would result from the absorption of? A. nitrogen B. neon C. argon D. oxygen Detailed SolutionAlkaline pyrogallol absorbs 92 |
|
| 15. |
Which of the following ions is a pollutant in drinking water even in trace amounts? A. Ca2+ B. Hg2+ C. Mg2+ D. Fe2+ |
B |
| 16. |
The solubility of copper (II) tetraoxosulphate (Iv) is 75g in 100g of water at 100°C and 25g in 100g of water at 30°C. What mass of the salt would crystallize, if 50g of copper (II) tetraoxosulphate (VI) solution saturated at 100°C were cooled to 30°C ? A. 57.5 B. 42.2 C. 28.6 D. 14.3 Detailed Solutionsolute + solvent = solutionat 100oC; 75g + 100g = 175g at30oC; \(\frac{25g}{50g}\) + 100g = 125g From 100oC - 30oC; 175g CuSO4 ppt 50g From 100oC - 30oC; 50g CuSO4 ppt \(\frac{50 \times 50}{175}\) = 14.3 |
|
| 17. |
A sample of temporary hard water can be prepared in the laboratory by? A. disolving calcium chloride in distilled water B. saturating lime water with carbon (IV) oxide C. saturating distilled water with calcium hydroxide D. dissolving sodium hydrogen trioxocarbonate (IV) in some distilled water |
B |
| 18. |
A property of a colloidal dispersion which a solution does not have is? A. the Tyndall effect B. homogeneity C. osmotic pressure D. surface polarity |
A |
| 19. |
50 cm3 of sulphur (IV) oxide, 800 cm3 of ammonia, 450 cm3 of hydrogen chloride, 1.0 cm3 of at 15°C. Which of the following is suitable for demonstrating the fountain experiment? A. Sulphur (IV) oxide hydrogen chloride B. Carbon (IV) oxide and amonia C. Amonia and hydrogen chloride D. Carbon (IV) oxide and surphur (IV) oxide |
C |
| 20. |
How many structural isomers can be written for the alkyl bromide, C4H9Br? A. 3 B. 4 C. 6 D. 8 |
B |