Year :
2005
Title :
Chemistry
Exam :
JAMB Exam
Paper 1 | Objectives
11 - 20 of 49 Questions
| # | Question | Ans |
|---|---|---|
| 11. |
The enzymes responsible for converting sucrose into two simple isomeric sugars is A. maltase B. amylase C. invertase D. lactase |
C |
| 12. |
The decolourization of purple colour of tetraoxomanganate (VII) ion is a test for A. alkenes B. alkanols C. alkanals D. alkanes |
A |
| 13. |
Which of the following are structural isomers? A. propanoic acid and propan-1, 2-diol B. Propanal and propanone C. Ethanoic acid and propanoic acid D. Ethan-1, 2-diol and ethanoic acid |
B |
| 14. |
In the purification of impure samples of ethyl ethanoate synthesized by esterification, concentrated sodium trioxocarbonate (IV) solution is used to remove A. water B. basic impurities C. acidic impurities D. ethoxyethane |
C |
| 15. |
How many hydrogen atoms does a single ring cycloalkane have less than the corresponding open-chain alkane? A. Two B. Three C. Four D. One |
A |
| 16. |
Equal moles of ethyne and hydrogen iodide react to give A. CH2 = CH2 B. CH2 - CHI C. CH3 - CI D. CH2 = CHI |
D |
| 17. |
A substance that is used as a ripening agent for fruits is? A. ethene B. propene C. methane D. butane Detailed Solution- Ethene is a plant hormone which causes fruit to ripen.- Ethene is used routinely within the food industry to provide controlled ripening during storage and transport or when fruit is displayed in shops, in sealed packages. |
|
| 18. |
When water boilers are used for long period of time, the solid substances left behind as scale are A. magnesium trioxosilicate (IV) and rust B. magnesium trioxosilicate (IV) and calcium tetraoxosulphate (VI) C. clay and magnesium troxosulphate (IV) D. clay and rust |
A |
| 19. |
25cm3 of a mixture of nobel gases was obtained from air after the removal of other constituents. What was the original volume of air A. 2,500 cm3 B. 1250 cm3 C. 125 cm3 D. 80 cm3 Detailed SolutionPercentage of noble gases in air is 1%25 = (1/100) * T ∴ T = 25 * 100 = 2500 cm3 |
|
| 20. |
The solubility curve shows the variation of solute concentration with A. volume B. temperature C. vapour density D. pressure |
B |
| 11. |
The enzymes responsible for converting sucrose into two simple isomeric sugars is A. maltase B. amylase C. invertase D. lactase |
C |
| 12. |
The decolourization of purple colour of tetraoxomanganate (VII) ion is a test for A. alkenes B. alkanols C. alkanals D. alkanes |
A |
| 13. |
Which of the following are structural isomers? A. propanoic acid and propan-1, 2-diol B. Propanal and propanone C. Ethanoic acid and propanoic acid D. Ethan-1, 2-diol and ethanoic acid |
B |
| 14. |
In the purification of impure samples of ethyl ethanoate synthesized by esterification, concentrated sodium trioxocarbonate (IV) solution is used to remove A. water B. basic impurities C. acidic impurities D. ethoxyethane |
C |
| 15. |
How many hydrogen atoms does a single ring cycloalkane have less than the corresponding open-chain alkane? A. Two B. Three C. Four D. One |
A |
| 16. |
Equal moles of ethyne and hydrogen iodide react to give A. CH2 = CH2 B. CH2 - CHI C. CH3 - CI D. CH2 = CHI |
D |
| 17. |
A substance that is used as a ripening agent for fruits is? A. ethene B. propene C. methane D. butane Detailed Solution- Ethene is a plant hormone which causes fruit to ripen.- Ethene is used routinely within the food industry to provide controlled ripening during storage and transport or when fruit is displayed in shops, in sealed packages. |
|
| 18. |
When water boilers are used for long period of time, the solid substances left behind as scale are A. magnesium trioxosilicate (IV) and rust B. magnesium trioxosilicate (IV) and calcium tetraoxosulphate (VI) C. clay and magnesium troxosulphate (IV) D. clay and rust |
A |
| 19. |
25cm3 of a mixture of nobel gases was obtained from air after the removal of other constituents. What was the original volume of air A. 2,500 cm3 B. 1250 cm3 C. 125 cm3 D. 80 cm3 Detailed SolutionPercentage of noble gases in air is 1%25 = (1/100) * T ∴ T = 25 * 100 = 2500 cm3 |
|
| 20. |
The solubility curve shows the variation of solute concentration with A. volume B. temperature C. vapour density D. pressure |
B |