Tag: rocks and minerals

Questions Related to rocks and minerals

Cetane number is the percentage of cetane (octa-decane) in a given diesel sample.

chemistry energy rocks and minerals petroleum and natural gas fossil fuels

  1. True

  2. False

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Correct Option: B
Explanation:

Cetane number is the percentage of cetane (hexa-decane) in a given diesel sample.

Which of the following catalyst is used in the manufacture of synthetic petrol by Bergius method?

chemistry energy rocks and minerals petroleum and natural gas fossil fuels

  1. Ferric oxide

  2. Ferrous oxide

  3. Aluminium oxide

  4. Silica

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Correct Option: A
Explanation:

Ferric oxide is used as a catalyst in the manufacture of synthetic petrol by Bergius method.

Which of the following can be used to increase the octane number?

chemistry energy rocks and minerals petroleum and natural gas fossil fuels

  1. Increasing the percentage of branched or cycloalkanes

  2. By addition of BTX or TEL

  3. By addition of powder alcohol (ethanol)

  4. All of the above.

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Correct Option: D
Explanation:

Octane number can be increased by any of the following methods:
(1) Increasing the percentage of branched or cycloalkanes.
(2) By addition of BTX or TEL.
(3) By addition of powder alcohol (ethanol).

What is the octane number of triptane?

chemistry energy rocks and minerals petroleum and natural gas fossil fuels

  1. 45

  2. 25

  3. 100

  4. 125

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Correct Option: D
Explanation:

Octane number is the percentage by volume of iso-octane present in a mixture of iso-octane and heptane which has the same knocking performance as the sample fuel. For eg - octane number of triptane is 125. Hence, the answer is D.

Cyclic alkanes have relatively lower value of octane number.

chemistry energy rocks and minerals petroleum and natural gas fossil fuels

  1. True

  2. False

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Correct Option: B
Explanation:

Cyclic alkanes have relatively higher value of octane number.

Aviation gasoline has octane number of 100 or more.

chemistry energy rocks and minerals petroleum and natural gas fossil fuels

  1. True

  2. False

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Correct Option: A
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.

In case of straight chain hydrocarbons, the octane number increases with increase in the length of the chain.

chemistry energy rocks and minerals petroleum and natural gas fossil fuels

  1. True

  2. False

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Correct Option: B
Explanation:

In case of straight chain hydrocarbons, the octane number decreases with increase in the length of the chain.

The octane numbers of aromatic hydrocarbons are exceptionally low.

chemistry energy rocks and minerals petroleum and natural gas fossil fuels

  1. True

  2. False

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Correct Option: B
Explanation:

The octane numbers of aromatic hydrocarbons are exceptionally high.

Introduction of double or triple bond decreases the value of octane number.

chemistry energy rocks and minerals petroleum and natural gas fossil fuels

  1. True

  2. False

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Correct Option: B
Explanation:

Introduction of double or triple bond increases the value of octane number.

What is the octane number of $n$-nonane?

chemistry energy rocks and minerals petroleum and natural gas fossil fuels

  1. 0

  2. $-20$

  3. 100

  4. more than 100

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Correct Option: B
Explanation:

$n$-nonane has an octane number of $-20$.