Year :
1986
Title :
Chemistry
Exam :
JAMB Exam
Paper 1 | Objectives
21 - 30 of 47 Questions
| # | Question | Ans |
|---|---|---|
| 21. |
The iron (III) oxide impurity in bauxite can be removed by? A. Fractional crystallization in acid solution B. dissolution in sodium hydroxide and filtration C. extraction with concentrated ammonia and reprecipitation D. electroysis of molten mixture |
B |
| 22. |
Which of the following does NOT contain aluminium as component? A. Over-head cables B. Duralumin C. Container for caustic soda D. Container for nitric acid Detailed SolutionSodium Hydroxide reacts with metals, such as Aluminium, Lead, Tin and Zinc, to form flammable and explosive Hydrogen gas. Hence, Aluminium cannot be used as a component for storing caustic soda. |
|
| 23. |
A white solid suspected to be lead trioxonitrate (V) zinc trioxocarbonate (IV) or calcium trioxocabonate (IV) was heated strongly. Its residue which was yellow when hot and white when cold is? A. lead (II) oxide B. calcium oxide C. zinc oxide D. lead nitrate |
C |
| 24. |
Which of the following compounds would give lilac flame coloration and a white precipitate with acidified barium chloride solution? A. KCI B. NaNO3 C. K2SO4 D. CaSO4 |
C |
| 25. |
How will a metal X, which reacts explosively with air and with dilute acids be best extracted from its ores? A. Electrolysis of solution of its salts B. Decomposition of its oxides C. Displacement from solution by an alkali metal D. Electroiysis of fused salt |
D |
| 26. |
Which of the following is NOT correct test for the named organic compound in each case? A. Butanoic acid solution gives effervescence with Na2CO3 solution B. Glucose when reacted with Na2CrO4 at 0°C will show immediate discharge of colour C. When but-2-ene is reacted with dilute solution of KMnO4 the purple colour of KMnO is discharged readily even room temperature D. When butan-2-ol is boiled with butanoic acid with a drop of concentrated H2SO4 a sweet smelling liquid is produced |
B |
| 27. |
Which of the following is used as an 'anti-knock' in automobile engines? A. Tetramethyl silane B. Lead tetra-ethyl C. Glycerol D. n-heptane |
B |
| 28. |
What reaction takes place when palm-oil is added to potash and foam are observed? A. Neutralization B. Saponification C. Esterification D. Salting-out |
B |
| 29. |
When ethanol is heated with excess concentrated sulphuric acid, the ethanol is? A. oxidized to ethene B. polymerized to polyethene C. dehydrated to ethene D. dehydrated to ethyne |
C |
| 30. |
Which of the following compounds is NOT formed by the action of chlorine on methane? A. CH3CI B. C2H5CI C. CH2CI2 D. CHCI3 |
B |
| 21. |
The iron (III) oxide impurity in bauxite can be removed by? A. Fractional crystallization in acid solution B. dissolution in sodium hydroxide and filtration C. extraction with concentrated ammonia and reprecipitation D. electroysis of molten mixture |
B |
| 22. |
Which of the following does NOT contain aluminium as component? A. Over-head cables B. Duralumin C. Container for caustic soda D. Container for nitric acid Detailed SolutionSodium Hydroxide reacts with metals, such as Aluminium, Lead, Tin and Zinc, to form flammable and explosive Hydrogen gas. Hence, Aluminium cannot be used as a component for storing caustic soda. |
|
| 23. |
A white solid suspected to be lead trioxonitrate (V) zinc trioxocarbonate (IV) or calcium trioxocabonate (IV) was heated strongly. Its residue which was yellow when hot and white when cold is? A. lead (II) oxide B. calcium oxide C. zinc oxide D. lead nitrate |
C |
| 24. |
Which of the following compounds would give lilac flame coloration and a white precipitate with acidified barium chloride solution? A. KCI B. NaNO3 C. K2SO4 D. CaSO4 |
C |
| 25. |
How will a metal X, which reacts explosively with air and with dilute acids be best extracted from its ores? A. Electrolysis of solution of its salts B. Decomposition of its oxides C. Displacement from solution by an alkali metal D. Electroiysis of fused salt |
D |
| 26. |
Which of the following is NOT correct test for the named organic compound in each case? A. Butanoic acid solution gives effervescence with Na2CO3 solution B. Glucose when reacted with Na2CrO4 at 0°C will show immediate discharge of colour C. When but-2-ene is reacted with dilute solution of KMnO4 the purple colour of KMnO is discharged readily even room temperature D. When butan-2-ol is boiled with butanoic acid with a drop of concentrated H2SO4 a sweet smelling liquid is produced |
B |
| 27. |
Which of the following is used as an 'anti-knock' in automobile engines? A. Tetramethyl silane B. Lead tetra-ethyl C. Glycerol D. n-heptane |
B |
| 28. |
What reaction takes place when palm-oil is added to potash and foam are observed? A. Neutralization B. Saponification C. Esterification D. Salting-out |
B |
| 29. |
When ethanol is heated with excess concentrated sulphuric acid, the ethanol is? A. oxidized to ethene B. polymerized to polyethene C. dehydrated to ethene D. dehydrated to ethyne |
C |
| 30. |
Which of the following compounds is NOT formed by the action of chlorine on methane? A. CH3CI B. C2H5CI C. CH2CI2 D. CHCI3 |
B |