Chemistry · General Awareness

Carbon and Fossil Fuels

1,756 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 energy rocks and minerals petroleum and natural gas fossil fuels

Which of the following is used for cracking?

  1. Vapour phase cracking

  2. Cracking in presence of hydrogen

  3. Liquid phase cracking

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

Any of the following method is used for cracking
(A) Vapour phase cracking
(B) Liquid phase cracking
(C) Cracking in presence of hydrogen.

Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

Which of the following is/are true?

  1. Gasolines with octane number of 74 are called regular gasolines

  2. Gasolines with octane number lower than 74 are called third grade gasolines

  3. Gasolines with octane number of 84 or above are called premium gasolines

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

All of the given statements are true.
(A) Gasolines with octane number of 74 are called regular gasolines.
(B) Gasolines with octane number lower than 74 are called third grade gasolines.
(C) Gasolines with octane number of 84 or above are called premium gasolines.

Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

A motor fuel is said to have an octane number of 20 when it is as good as a mixture of 20% n-heptane and 80% of iso-octane.

  1. True

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

A motor fuel is said to have an octane number of 80 when it is as good as a mixture of 20% n-heptane and 80% of iso-octane.
The octane number of gasoline is defined as the percentage of iso-octane present in a mixture of iso-octane and n-heptane, when the mixture has the same knocking in the engine, as the gasoline under examination.


Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

The octane number of gasoline is defined as the percentage of n-heptane present in a mixture of iso-octane and n-heptane, when the mixture has the same knocking in the engine, as the gasoline under examination.

  1. True

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

The octane number of gasoline is defined as the percentage of iso-octane present in a mixture of iso-octane and n-heptane, when the mixture has the same knocking in the engine, as the gasoline under examination.

Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

Aviation gasoline has octane number of 100 or more.

  1. True

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

Aviation gasoline has octane number of 100 or more. Aviation gasoline is the fuel used in aeroplanes. Use of gasoline with lower octane number may lead to the problem of engine knocking.

Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

During carbonisation or destructive distillation of coal, bituminous coal is heated in iron or fire clay retorts to high temperature (500 deg C) in presence of air.

  1. True

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

During carbonization or destructive distillation of coal, bituminous coal is heated in iron or fireclay retorts to high temperature (1000-1400 deg C) in absence of air.

Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

Common method of manufacturing synthetic petrol is/are:

  1. Fischer Tropsch conversion

  2. Methanol to gasoline conversion

  3. Coal liquefaction

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

Common methods for manufacturing Synthetic fuels include the Fischer Tropsch conversion, methanol to gasoline conversion or direct coal liquefaction.

Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

Raman took fuel for his vehicles from two petrol pumps $A$ and $B$ and found that the fuel from pump A caused more noise than that from pump B.Choose the correct relation of octane no.

  1. Octane no(A)>Octane no(B)

  2. Octane no(B)>Octane no(A)

  3. Octane no(A)=Octane no(B)

  4. can't be predicted
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Octane number $\propto$ 1/knocking tendency

So, more the octane number, lesser the knocking tendency, and hence less is the noise.

Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

Which of the following is not produced in Hydrocracking?

  1. Jet fuel

  2. Diesel

  3. Petrol

  4. LPG
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The major products from hydrocracking are jet fuel and diesel, but low sulphur naphtha fractions and LPG are also produced. All these products have a very low content of sulphur and other contaminants.