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 rocks and minerals coal and its products study of coal coal

Which is an almost pure form of carbon?

  1. Coke

  2. Coal tar

  3. Coal gas

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Coke is a fuel with few impurities and a high carbon content, usually made from coal. It is the solid carbonaceous material derived from destructive distillation of low-ash, low-sulfur bituminous coal. Coal tar and coal gas contain more impurities than coke.

Multiple choice chemistry rocks and minerals coal and its products study of coal coal

Coke is used in the preparation of:

  1. $CO + {H} _{2}$
  2. $CO + {N} _{2}$

  3. graphite artificially

  4. diamond artificially
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

Coke is used in the preparation of water gas(A), coal gas(B) and graphite but it is not used in the preparation of diamond.

Multiple choice chemistry rocks and minerals coal and its products study of coal coal

Which of the following constituents of coal is the most important in production of coke?

  1. Ash

  2. Moistures

  3. Carbon

  4. All of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Coal is the measurable exhaustible natural fuel. It is processed in the industry to get products like coke. Carbon is the measurable constituent of coke which is required in the production of coke.

Multiple choice chemistry rocks and minerals coal and its products study of coal coal

On which of the following content of coke, its price depend?

  1. Sulphur

  2. Ash

  3. Nitrogen

  4. Both a and b
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Price of the coke depends upon the coal which is used for the production of coke. Because the concentration of sulphur and ash vary in cokes, this is the main content of the coke on which its price depends.

Multiple choice chemistry rocks and minerals coal and its products study of coal coal

__________ is widely used as fuel in factories and thermal power stations.

  1. Petroleum

  2. LPG

  3. Coal

  4. CNG
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Coal is widely used as a fuel in the coal based industries due to its advantages as its high calorific value. It releases less amount of smoke after burning. 

So, coal is widely used fuel in factories and thermal power stations.

Hence, option C is correct.
Multiple choice chemistry rocks and minerals coal and its products study of coal coal

Coke is used in the preparation of :

  1. $CO+H _2$
  2. $CO+N _2$

  3. Graphite artificially

  4. Diamond artificially
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

Coke is used in the preparation of water gas ($CO+H _2$), producer gas ($CO+N _2$) and graphite by artificial methods.

$C+H _2O\rightarrow CO+H _2$

$C+air\rightarrow CO+N _2$.

Hence options A,B and C are correct.

Multiple choice chemistry rocks and minerals coal and its products study of coal coal

The density of coal is _______ when compared to coke.

  1. more

  2. less

  3. same

  4. can't say anything
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Coal is a naturally available substance whereas Coke is prepared substance  with some  impurities and high Carbon content, usually made from Coal.While Coal is Solid mass in physical appearance, Coke is Porous ( it means that it has large surface area ).

So the density of coal is more than the coke as coke is porous which has large surface area.

Hence option A is correct.

Multiple choice chemistry rocks and minerals coal and its products study of coal coal

Peat is the first stage product of coal consisting of _____ carbon.

  1. 20%

  2. 60%

  3. 35%

  4. 80%
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Peat is  first stage of transformation. Which contains 60% carbon and impurities like sufficient volatile matter and lot of moisture. It burns like wood, gives less heat, emits more smoke and leaves a lot of ash.

Multiple choice chemistry rocks and minerals coal and its products study of coal coal

Coal is a substance mainly containing carbon also having oxygen, hydrogen, nitrogen and _______.

  1. sodium

  2. sulphur

  3. aluminium

  4. chlorine
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Coal is the substance composed of mainly carbon. Hydrogen, nitrogen, sulfur, and oxygen also present as impurities. Anthracite has the most carbon, while lignite is the lowest in carbon, but highest in hydrogen and oxygen.

Multiple choice chemistry rocks and minerals coal and its products study of coal coal

Which of the following fraction of coal tar distillation is obtained at 270° - 360°C?

  1. Light Oil

  2. Middle oil

  3. Green Oil

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Green oil is obtained at 270° - 360°C by distillation of coal tar. It mainly has anthracene and phenanthrene. 

So, the correct option is $C$
Multiple choice chemistry rocks and minerals coal and its products study of coal coal

The organic compound obtained from coal is/are:

  1. benzene and phenol

  2. naphthelene

  3. anthracene

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

Most of the carbon structures in the organic part of the coal are “alkylaromatics”, that is aromatic cores with aliphatic appendages like benzene, naphthelene and anthracene.
coal is heated in several different processes, all of which produce gases, liquids, asphaltic solids, and crude carbon charcoal. These are processed furthur to give several industrial products, invariably consisting of inseparable mixtures of organic compounds.

Multiple choice chemistry rocks and minerals coal and its products study of coal coal

Naphthalene balls used to repel moths and other insects are obtained from X. These days Y, a petroleum product, is used in place of X for metalling the roads. What are X and Y respectably?

  1. Coke, coal

  2. Coal, coke

  3. Bitumen, coal tar

  4. Coal tar, bitumen
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Napthalene balls used to repel moth and other insects are also obtained from coal tar. These days Bitumen, a petroleum product is used in place of coal tar for metalling roads. The gases present in coal gas are combustible.