Tag: petroleum and natural gas

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

Which one is true for the octane number of following organic compounds?

  1. Aromatic Compound $>$ Aliphatic compound
  2. Aromatic compound $<$ Aliphatic compound
  3. Aromatic compound $=$ Aliphatic compound

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The octane number of a fuel is based on how fuels auto-ignite, under compression.
1. It is based on the scale where isooctane is 100 (minimal ignition under pressure) and heptane is 0 (easily ignites under pressure).
For example, petrol with an octane number of 92 has the same knock as a    mixture of 92% isooctane and 8% heptane.
2. Octane rating decreases with an increase in the carbon chain length.
3. Octane ratings increase with carbon chain branching.
4. Octane ratings increase in aromatics with the same number of carbons.

Hence, the correct option is $A$
Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

In steam cracking, initiation usually involves breaking a chemical bond between:

  1. carbon and hydrogen atom

  2. carbon atoms

  3. carbon-hydrogen and carbon-carbon simultaneously

  4. no bond is completely broken in initiation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In steam cracking, initiation usually involves breaking a chemical bond between two carbon atoms, rather than the bond between a carbon and a hydrogen atom.

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

Most of the chemical reactions in Cracking is based on:

  1. Carbocation formation

  2. Carbanion formation

  3. Radical formation

  4. Zwitter ion formation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In cracking, the initial process involves the breaking down of hydrocarbons into free radicals.Only a small fraction of the feed molecules actually undergo initiation, but these reactions are necessary to produce the free radicals that drive the rest of the reactions.

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

Select the correct option about the Octane number of the organic compound.

  1. Saturated compound $>$ Unsaturated compound
  2. Saturated compound $<$ Unsaturated compound
  3. Saturated compound $=$ Unsaturated compound

  4. Both A and B
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An unsaturated compound has a higher octane rating than a saturated compound.

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

The correct relation of the Octane number for the following is:

  1. straight chain $>$ branched chain
  2. straight chain $<$ branched chain
  3. straight chain $=$ branched chain

  4. both A and B
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The octane number of a fuel is based on how fuels auto-ignite, under compression.

1. It is based on the scale where isooctane is 100 (minimal ignition under pressure) and heptane is 0 (easily ignites under pressure).

2. Octane rating decreases with an increase in the carbon chain length.

3. Octane ratings increase with carbon chain branching.

4. Octane ratings increase in aromatics with the same number of carbons.

Hence, the correct option is $B$.
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.

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

The highest value of octane number among the following is of:

  1. n-butane

  2. toluene

  3. i-pentane

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

Octane number is a standard measure of the performance of an engine or aviation fuel. The higher the octane number a fuel has, more compression the fuel can withstand before igniting. Also, higher the octane number, better is the performance of the fuel.
In the given options, toluene has the highest octane number.

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

Which among the given examples, is not used as oxygenates?

  1. MEG

  2. Ethanal

  3. MTBE

  4. TAME
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • Oxygenates are the chemical compounds containing oxygen.
  • They are usually employed as gasoline additives.
  • Commonly used oxygenates are alcohols or ethers.
  • Here, ethanal, MTBE and TAME are ethers. Thus, MEG (Mono ethylene glycol) is not used as oxygenates.