Tag: rocks and minerals

Questions Related to rocks and minerals

Coking coal is coal which on carbonisation goes through:

chemistry energy rocks and minerals petroleum and natural gas fossil fuels

  1. softening.

  2. swelling.

  3. resolidification.

  4. All of the above.

Show answer
Correct Option: D
Explanation:

A good quality coke is generally made from carbonisation of good quality coking coals.

Coking coals are defined as coals that on carbonisation process passes through softening, swelling and resolidification of coke. 

Which of the following is used for cracking?

chemistry energy rocks and minerals petroleum and natural gas fossil fuels

  1. Vapour phase cracking

  2. Cracking in presence of hydrogen

  3. Liquid phase cracking

  4. Any of the above.

Show answer
Correct Option: D
Explanation:

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

State whether the given statement is true or false.

Statement: In cracking, a less valuable lower fraction of petroleum run is converted into more valuable higher fractions by heating.
chemistry energy rocks and minerals petroleum and natural gas fossil fuels

  1. True

  2. False

Show answer
Correct Option: B

Reforming (also called aromatization) is the conversion of aromatic hydrocarbons into aliphatic hydrocarbons containing the same number of carbon atoms.

chemistry energy rocks and minerals petroleum and natural gas fossil fuels

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Reforming (also called aromatization) is the conversion of aliphatic hydrocarbons into aromatic hydrocarbons containing the same number of carbon atoms.

Which of the following is/are true?

chemistry energy rocks and minerals petroleum and natural gas fossil fuels

  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

Show answer
Correct Option: D
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.

Ordinary gasolines having an octane number of ____ are used in motor cars, scooter and motorcycles.

chemistry energy rocks and minerals petroleum and natural gas fossil fuels

  1. 74

  2. 52

  3. 26

  4. 66

Show answer
Correct Option: A
Explanation:

Ordinary gasolines having an octane number of 74 are used in motor cars, scooter and motorcycles.

State whether the given statement is true or false.

Statement: Lower the octane number, better will be the fuel.
chemistry energy rocks and minerals petroleum and natural gas fossil fuels

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Octane number expresses the knocking characteristics of petrol. n-heptane (a constituent of petrol) knocks very badly, so its anti-knock value has been given zero. On the other hand, iso-octane (also a constituent of petrol) gives very little knocking, so its anti-knock value has been given 100
The higher the octane number, the more compression the fuel can withstand before detonating (igniting) i.e fuels with a higher octane rating are used in high-performance gasoline engines that require higher compression ratios and with lower octane numbers are ideal for diesel engines,as diesel engines do not compress the fuel, but rather compress only air and then inject fuel into the air which was heated by compression.


Hence, the given statement is $false$

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.

chemistry energy rocks and minerals petroleum and natural gas fossil fuels

  1. True

  2. False

Show answer
Correct Option: B
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.


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.

chemistry energy rocks and minerals petroleum and natural gas fossil fuels

  1. True

  2. False

Show answer
Correct Option: B
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.

The hydrocarbon iso-octane which has good resistance to knocking even in highest compression motors is arbitrarily given an octane number of 0. Whereas n-heptane which knocks the maximum is arbitrarily given the value of 100.

chemistry energy rocks and minerals petroleum and natural gas fossil fuels

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

The hydrocarbon iso-octane which has good resistance to knocking even in highest compression motors is arbitrarily given an octane number of 100. Whereas n-heptane which knocks the maximum is arbitrarily given the value of 0.