Tag: properties of alkanes

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Multiple choice chemistry petrochemicals and polymers petroleum properties of alkanes petroleum and natural gas rocks and minerals

Petrol for aviation purposes must contain?

  1. Straight chain hydrocarbons

  2. Aromatic hydrocarbons

  3. Olefinic hydrocarbons

  4. Highly branched chain paraffins
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The production of higher molecular weight branched chain paraffins having valuable antiknock properties and, therefore, suitable for use in aviation fuels is of considerable importance in the petroleum industry.

Multiple choice chemistry petrochemicals and polymers petroleum properties of alkanes petroleum and natural gas rocks and minerals

Which component, obtained from the refining of petroleum, is used as a solvent in petrochemicals.

  1. Tar

  2. Kerosene

  3. Naphthalene

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

Naphthalene (an aromatic hydrocarbon) is obtained from the refining of petroleum. It is used as a solvent in petrochemicals. Naphthalene is non polar solvent and is used to dissolve non polar compounds.

Multiple choice chemistry petrochemicals and polymers petroleum properties of alkanes petroleum and natural gas rocks and minerals

Petroleum refineries remove chemical compounds that contain sulphur in order to:

  1. prevent pollution of the air by sulphur

  2. make pure, white petrol

  3. increase the mileage of petrol

  4. use the sulphur to make other compounds cheaply
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Air is polluted by sulphur by converting into sulphur dioxide. So, petroleum refineries remove chemical compounds that contain sulphur.

Multiple choice chemistry petrochemicals and polymers petroleum properties of alkanes petroleum and natural gas rocks and minerals

Paraffin is a by-product of?

  1. Cottage industries involving bee-keeping

  2. Processing of agricultural wastes

  3. Petroleum refining

  4. Leather industry
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Paraffin, a white or colourless, tasteless, odourless, water-insoluble, solid substance not easily acted upon by reagents, consisting of a mixture of hydrocarbons chiefly of the alkane series, obtained from crude petroleum in Petroleum Refining.
Multiple choice chemistry petrochemicals and polymers petroleum properties of alkanes petroleum and natural gas rocks and minerals

Which of the following is obtained on fractional distillation of petroleum ?

  1. Paraffin wax

  2. Asphalt

  3. Petroleum gas

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

Paraffin wax, Petroleum gas and Asphalt are the different constituents of petroleum which  vapourise at different temperature's in the fractional distillation of petroleum. 

Multiple choice chemistry petrochemicals and polymers petroleum properties of alkanes petroleum and natural gas rocks and minerals

Petrol is a mixture of hydrocarbons with ______ carbon atoms.

  1. 2 to 5

  2. 5 to 9

  3. 5 to 7

  4. 4 to 6
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Petroleum is a very complex mixture of hydrocarbons-compounds that consist of carbon and hydrogen only. Small amounts of other organic compounds containing oxygen, sulfur, nitrogen, phosphorus, and other elements are also present.
  • Petroleum is a mixture of a very large number of different hydrocarbons; the most commonly found molecules are alkanes (paraffin), cycloalkanes (naphthenes), aromatic hydrocarbons, or more complicated chemicals like asphaltenes.
  • This mixture of hydrocarbons generally has 5 to 9 carbon atoms.
  • Hence option B is a correct answer.
Multiple choice chemistry petrochemicals and polymers petroleum properties of alkanes petroleum and natural gas rocks and minerals

Gasoline is a mixture of?

  1. $C _3 - C _5$ alkanes
  2. $C _{15} - H _{20}$ alkanes
  3. $C _{11} - C _{15}$ alkanes
  4. $C _7 - C _9 $ alkanes
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Gasoline is a refined product of petroleum and is comprised mainly of hydrocarbons, ranging from those conatining 7 carbon atoms  to those containing 9 carbon atoms. 

Multiple choice chemistry petrochemicals and polymers petroleum properties of alkanes petroleum and natural gas rocks and minerals

The order of appearance of the following with rising temperature during the refining of crude oil is?

  1. Kerosene oil , gasoline, diesel

  2. Diesel, gasoline, kerosene oil

  3. Gasoline, diesel, kerosene oil

  4. Gasoline, kerosene oil, diesel
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

During refining of crude oil, different products are recovered according to the different boiling ranges. The order of boiling point of the given products is: Gasoline< kerosene< diesel. Therefore they are obtained in the sequence;Gasoline, kerosene ,diesel.