Chemistry · General Awareness

Carbon and Fossil Fuels

1,898 Questions

Review fundamental concepts regarding carbon compounds, coal distillation, and fossil fuel formation. This segment covers the chemical properties and industrial applications of natural gas and crude oil. Practicing these questions will strengthen your chemistry foundation for general science sections.

Coal distillationPetroleum formationProperties of crude oilNatural gas applications

Carbon and Fossil Fuels Questions

Multiple choice chemistry separation of matter sedimentation, decantation and filtration other methods of separation separation methods
The combustion of candles, containing paraffin wax, to carbon dioxide and water vapour is sublimation.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The term sublimation refers to a physical change of state and is not used to describe transformation of a solid to a gas in a chemical reaction. The combustion of candles, containing paraffin wax, to carbon dioxide and water vapor is not sublimation but a chemical reaction with oxygen.

Multiple choice chemistry principles and processes of isolation of elements refining of metals basics of metallurgy basic metallurgical processes

In Poling process, Hydrocarbon gases escaping from the poles act as _____ agents.

  1. reducing

  2. oxidation

  3. both

  4. none
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Poling is a process in which the impure metal containing oxide as impurities is purified. It is melted and stirred with green poles of wood. Hydrocarbon gases escaping from the poles act as reducing agents and reduce the oxide impurities e.g., impurity of Cu$ _2$O which is reduced to metallic copper by poling.
$Cu _2O + CO \rightarrow 2Cu + CO _2 \uparrow$
$Cu _2O + H _2 \rightarrow 2Cu + H _2O$

Multiple choice chemistry principles and processes of isolation of elements refining of metals basics of metallurgy basic metallurgical processes

In polling, wood gas is responsible for the removal of volatile impurities.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

True. Polling is used for converting Copper Oxide $(Cu _2O)$ to Copper $(Cu)$. When ore is heated with wood poles, the poles release charcoal, shoot and gas. The gas released reduces $CuO$ to $Cu$. So the gas takes away impurities. 

Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

Which one of the following is a compound?

  1. The black residue left when sugar is charred

  2. Nitrogen gas

  3. Air

  4. Carbon dioxide
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Among these only carbon dioxide is a compound.

Compound is a substance formed from two or more elements chemically bonded in a definite proportion.
Example- Carbon dioxide, water, glucose, etc.
In the given options,
A- the black residue that is left after charring sugar is carbon. Carbon is an element in pure state.
B- Nitrogen gas is a molecule as it is composed of only one element ie., Nitrogen so this can't be termed as a compound.
C- Air is a homogeneous mixture of different gases.

Multiple choice commercial studies striving for a better environment soil and its conservations soil pollution-control protecting our environment

Pyrolysis means

  1. Burning in absence of carbon dioxide

  2. Burning in absence of oxygen

  3. Burning in absence of carbon monoxide

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pyrolysis is a thermochemical decomposition of organic material at high temperatures in the absence of oxygen. It involves the change of chemical composition as well as physical state. It is an irreversible process. The process is used heavily in the chemical industry to produce charcoal, activated carbon, to convert biomass into biochar, to turn waste into safely disposable substances.

Thus, the correct answer is option B.

Multiple choice commercial applications management of natural resources unequal distribution of resources protecting our environment rules are for everyone

Biogas is a good substitute for

  1. Natural gas

  2. Crude oil

  3. Coal

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Biogas is a renewable energy source produced from organic waste. It can serve as a substitute for various conventional fuels like natural gas, coal, and petroleum products in different applications.

Multiple choice commercial applications management of natural resources unequal distribution of resources protecting our environment rules are for everyone

Biogas can be a good substitute for

  1. Fuel gas

  2. Petroleum and oil

  3. Coal

  4. Charcoal
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Biogas is produced by the decomposition of organic material from plants and animals. It consists of mainly methane gas which can be used as fuel. Old feeds of organic matter of biogas process can be dried and used as soil manure or fertilizers. Thus the correct answer is A.
Multiple choice chemistry occurrence of carbon compounds in nature substances, objects and energy alternative fuels and energy sources alternative sources of energy

Hydrogen fuel is used in:

  1. liquid-propellant rockets

  2. portable fuel cell applications

  3. cars

  4. all of above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Hydrogen fuel can provide motive power for liquid-propellant rockets, cars, boats and airplanes, portable fuel cell applications or stationary fuel cell applications, which can power an electric motor. The problems of using hydrogen fuel in cars arise from the fact that hydrogen is difficult to store in either a high pressure tank or a cryogenic tank.

Multiple choice chemistry occurrence of carbon compounds in nature substances, objects and energy alternative fuels and energy sources alternative sources of energy

Hydrogen is a cleaner fuel than $CNG.$ 

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hydrogen gas is cleaner fuel than $CNG$ as $CNG$ contains hydrocarbons which in turn contains carbon and it is a form of pollutant present in $CNG.$  But hydrogen is waste-free. The fusion of hydrogen does not produce any waste and therefore it is cleaner than $CNG.$

Multiple choice chemistry occurrence of carbon compounds in nature substances, objects and energy alternative fuels and energy sources alternative sources of energy

Biofuels are different from fossil fuels in regard to greenhouse gases but are similar to fossil fuels in that biofuels contribute to air pollution

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Fuels extracted from plants and crops are known as biofuels. They not only help a struggling economy by providing jobs but also helps in reducing greenhouse gases up to much extent by emitting less pollution. 

Biofuels are produced from wheat, corn, soybean, and sugarcane which can be produced again and again and thus they are sustainable.
Like fossil fuel, biofuel also causes air pollution.