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CBSE Questions for Class 8 Chemistry Coal And Petroleum Quiz 11 - MCQExams.com
CBSE
Class 8 Chemistry
Coal And Petroleum
Quiz 11
Petroleum oil is found:
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deep underground (sea beds)
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in mountains
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in glacier
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in river
Explanation
Petroleum oil is found deep underground in seabeds.
State 'true' or 'false' for the following statement:
Coke is a byproduct of coal tar processing.
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True
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False
Explanation
Coke is a byproduct of coal processing. Coal tar is also a byproduct of coal processing.
Naphthalene balls are obtained from coal tar and are used as
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mosquito repellant
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moth repellant
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honey bee repellant
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snake repellant
Explanation
$$\text{Naphthalene balls are used as moth repellents.}$$ Naphthalene balls are solids that turn into toxic gas. The toxic gas kills insects and may repel animals
Though a few (gas-based) industries have been established, good reserves of natural gas in India remain unutilized. These vast resources of natural gas can be used in the production of :
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Graphite
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Carbide
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Fertilizers
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Synthetic petroleum
The dead aquatic organisms that were buried under the sand and clay of the sea bed, were converted to petroleum owing to:
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absence of air
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high temperature
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high pressure
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all of the above
Explanation
The dead aquatic organisms that were buried under the sand and clay of the seabed, were converted to petroleum owing to the absence of air, high temperature, and high pressure.
High temperature: The organic material is compressed between Earth’s mantle, with very high temperatures, and millions of tons of rock and sediment above.
Absence of air: Oxygen is completely absent in these conditions, and the organic matter begins to transform into a waxy substance named kerogen.
High pressure: With more heat, time, and pressure, the kerogen undergoes a process called catagenesis, and transforms into hydrocarbons. In this way, Petroleum is formed.
Hence, option D is correct.
Which substance is formed by the carbonisation of dead vegetation?
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Coal
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Petroleum
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Natural gas
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All of these
Explanation
$$\text{Coal is formed by the carbonization of dead vegetation.}$$
Due to high pressure and temperature and the absence of air, the wood of the buried forest plants and trees slowly got converted into coal. The slow process by which the dead plants buried under the Earth become coal is called carbonization.
Petroleum and Natural gas are formed when the remains of dead animals are subjected to high pressure and temperature.
Which type of solution is petrol?
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Liquid-liquid
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Liquid-solid
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Liquid-gas
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Sold-liquid
Kerosene is used as fuel because it is ______ than gasoline.
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less volatile
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more volatile
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cheap
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abundantly available
Explanation
$$Kerosene $$ is less volatile than gasoline. Its flash point (the temperature at which it will generate a flammable vapour near its surface) is $$ 38 °C (100 °F)$$ or higher, whereas that of gasoline is as low as $$ −40 °C (−40 °F). $$ This property makes kerosene a relatively safe fuel to store and handle.
The process of producing syn gas from coal is called coal gasification, which of the following reaction is correct for coal gasification?
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$$CO_{(g)}+2H_{2(g)}\xrightarrow {Cobalt}CH_3OH_{(1)}$$
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$$3H_{2(g)}+N_{2(g)}\xrightarrow[Fe]\,2NH_{3(g)}$$
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$$C_{(s)}+H_2O_{(g)}\xrightarrow {1270K}CO_{(g)}+H_{2(g)}$$
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None of these
Petroleum is a mixture of hydrocarbons containing _______.
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$$C_1-C_{14}$$ atoms
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$$C_{15}-C_{20}$$ atoms
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$$C_{20}-C_{40}$$ atoms
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$$C_1-C_{40}$$ atoms
Explanation
Petroleum is a very complex mixture of hydrocarbons compounds that consist of carbon and hydrogen only. Small amounts of other organic compounds containing oxygen, sulfur, nitrogen, phosphorus, and other elements are also present.
Petroleum is a mixture of a very large number of different hydrocarbons; the most commonly found molecules are alkanes (paraffin), cycloalkanes (naphthenes), aromatic hydrocarbons, or more complicated chemicals like asphaltenes.
Total petroleum hydrocarbons (TPH) is a term used for any mixture of hydrocarbons that are found in crude oil.
TPH is the sum of volatile petroleum hydrocarbons (VPH) and extractable petroleum hydrocarbons (EPH). VPH is also known as petrol (or gasoline) range organics (PRO or GRO) and includes hydrocarbons from $$C_{6}-C_{10}$$. Diesel range organics (DRO) includes hydrocarbons from $$ C_{10}-C_{28}$$.
Hence, option D is correct.
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