Year :
2009
Title :
Chemistry
Exam :
JAMB Exam
Paper 1 | Objectives
31 - 40 of 50 Questions
| # | Question | Ans |
|---|---|---|
| 31. |
Hydrogen sulphide gas can act as? A. an oxidizing agent B. a dehydrating agent C. a bleaching agent D. a precipitating agent Detailed SolutionWhen Hydrogen sulphide gas is bubbled through solutions of such metals, the colored sulphides are precipitated.Hydrogen sulphide is a also strong reducing agent. There is an explanation video available below. |
|
| 32. |
The gasification of coke is used for the manufacturing of? A. producer gas B. natural gas C. synthetic gas D. industrial gas Detailed SolutionGasification is a process that converts biomass- or fossil fuel-based carbonaceous materials into synthetic gasesThere is an explanation video available below. |
|
| 33. |
The gas that is most useful in protecting humans against solar radiation is? A. chlorine B. ozone C. carbon (IV) oxide D. hydrogen sulphide Detailed SolutionThe ozone layer in the stratosphere absorbs a portion of the radiation from the sun, preventing it from reaching the planet's surface.Most importantly, it absorbs the portion of UV light called UVB. There is an explanation video available below. |
|
| 34. |
Which of the following allotrope of carbon is a constituent of a lead pencil? A. Graphite B. Diamond C. Lampblack D. Soot Detailed SolutionWhen an element exists in more than one crystalline form, those forms are called allotropes; the two most common allotropes of carbon are diamond and graphite.Graphite is used in pencils and lubricants. It is a good conductor of heat and electricity. Its high conductivity makes it useful in electronic products such as electrodes, batteries, and solar panels. There is an explanation video available below. |
|
| 35. |
Which of the following metals will show the highest metallic character? A. Zinc B. Copper C. Barium D. Calcium Detailed SolutionThe reactivity series of metals, also known as the activity series, refers to the arrangement of metals in the descending order of their reactivities.Na > Ca > Mg > Al > Zn > Fe > Sn > Pb > Cu > Ag. Considering metallic property which increases down the group, barium will be ranked calcium There is an explanation video available below. |
|
| 36. |
Copper metal dissolves in concentrated trioxonitrate (V) acid with the resultant evolution of? A. CO2 B. SO2 C. NO2 D. CO Detailed SolutionOxidation of Copper turnings with concentrated trioxonitrate (V) acid wilCu + 4HNO\(_3\) → CuNO\(_3\) + 2H\(_2\)O +2NO\(_2\). There is an explanation video available below. |
|
| 37. |
The type of iron that is best suited for welding, making nails, chains and iron rods is? A. pig iron B. wrought iron C. cast iron D. iron pyrites |
|
| 38. |
In the electrolytic extraction of aluminum, the function of the molten cryolite is to A. precipitate aluminium hdroxide B. lower the melting point of aluminium oxide C. act as a raw materials D. act as a solvent |
|
| 39. |
One of the products of the thermal decomposition of sodium trioxonitrate (V) is A. sodium B. nitrogen C. sodium dioxonitrate (III) D. sodium oxide |
|
| 40. |
A cracking process in petroleum refining can be represented by A. heptane to heptene B. heptane to 3-methylhexane C. heptane to propene and butane D. heptane to 2,3,3-trimethybutane |
| 31. |
Hydrogen sulphide gas can act as? A. an oxidizing agent B. a dehydrating agent C. a bleaching agent D. a precipitating agent Detailed SolutionWhen Hydrogen sulphide gas is bubbled through solutions of such metals, the colored sulphides are precipitated.Hydrogen sulphide is a also strong reducing agent. There is an explanation video available below. |
|
| 32. |
The gasification of coke is used for the manufacturing of? A. producer gas B. natural gas C. synthetic gas D. industrial gas Detailed SolutionGasification is a process that converts biomass- or fossil fuel-based carbonaceous materials into synthetic gasesThere is an explanation video available below. |
|
| 33. |
The gas that is most useful in protecting humans against solar radiation is? A. chlorine B. ozone C. carbon (IV) oxide D. hydrogen sulphide Detailed SolutionThe ozone layer in the stratosphere absorbs a portion of the radiation from the sun, preventing it from reaching the planet's surface.Most importantly, it absorbs the portion of UV light called UVB. There is an explanation video available below. |
|
| 34. |
Which of the following allotrope of carbon is a constituent of a lead pencil? A. Graphite B. Diamond C. Lampblack D. Soot Detailed SolutionWhen an element exists in more than one crystalline form, those forms are called allotropes; the two most common allotropes of carbon are diamond and graphite.Graphite is used in pencils and lubricants. It is a good conductor of heat and electricity. Its high conductivity makes it useful in electronic products such as electrodes, batteries, and solar panels. There is an explanation video available below. |
|
| 35. |
Which of the following metals will show the highest metallic character? A. Zinc B. Copper C. Barium D. Calcium Detailed SolutionThe reactivity series of metals, also known as the activity series, refers to the arrangement of metals in the descending order of their reactivities.Na > Ca > Mg > Al > Zn > Fe > Sn > Pb > Cu > Ag. Considering metallic property which increases down the group, barium will be ranked calcium There is an explanation video available below. |
| 36. |
Copper metal dissolves in concentrated trioxonitrate (V) acid with the resultant evolution of? A. CO2 B. SO2 C. NO2 D. CO Detailed SolutionOxidation of Copper turnings with concentrated trioxonitrate (V) acid wilCu + 4HNO\(_3\) → CuNO\(_3\) + 2H\(_2\)O +2NO\(_2\). There is an explanation video available below. |
|
| 37. |
The type of iron that is best suited for welding, making nails, chains and iron rods is? A. pig iron B. wrought iron C. cast iron D. iron pyrites |
|
| 38. |
In the electrolytic extraction of aluminum, the function of the molten cryolite is to A. precipitate aluminium hdroxide B. lower the melting point of aluminium oxide C. act as a raw materials D. act as a solvent |
|
| 39. |
One of the products of the thermal decomposition of sodium trioxonitrate (V) is A. sodium B. nitrogen C. sodium dioxonitrate (III) D. sodium oxide |
|
| 40. |
A cracking process in petroleum refining can be represented by A. heptane to heptene B. heptane to 3-methylhexane C. heptane to propene and butane D. heptane to 2,3,3-trimethybutane |