1. Which one of the following statements about crude oil is NOT correct?
  • A.   Crude oil is a renewable resource
  • B.   Most compounds in crude oil are hydrocarbons
  • C.   Crude oil is the remains of ancient biomass that was buried in mud
  • D.   Crude oil is a mixture of a very large number of compounds

Q2-5:   Crude oil is separated into different fractions by fractional distillation.

Crude oil distiller
Terry Joyce | CC by S.A. 2.0

2. Before entering the column the crude oil must be ..

  • A.   cooled to condense it
  • B.   cooled to evaporate it
  • C.   heated to condense it
  • D.   heated to evaporate it
3. As the molecules in crude oil rise up the fractionating column they …
  • A.   cool down and evaporate
  • B.   cool down and condense
  • C.   heat up and condense
  • D.   heat up and evaporate

4. The physical property which allows the different fractions in crude oil to be collected at different heights in the column is ..

  • A.   boiling point
  • B.   density
  • C.   melting point
  • D.   viscosity

5. The fraction which collects at the top of the column has …

  • A.   small molecules with a low boiling point
  • B.   small molecules with a high boiling point
  • C.   large molecules with a low boiling point
  • D.   large molecules with a high boiling point

Q6-7: Four fractions obtained from fractional distillation of crude oil are heavy fuel oil, petrol, kerosene and diesel. The fraction which …..

6. ...has the highest boiling point is .
7. ...contains molecules with the least number of carbon atoms is .

8. As the number of carbon atoms in a hydrocarbon molecule increases the flamability, boiling point and viscosity change in the following way:

  flamability Boiling point viscosity
A decreases decreases decreases
B decreases increases increases
C increases increases decreases
D increases increases increases
9. The correct word equation for the complete combustion of a hydrocarbon fuel is ..
  • A.  fuel  +  oxygen  carbon dioxide + water
  • B.  fuel  +  oxygen  carbon dioxide +  hydrogen
  • C.  fuel  +  oxygen  carbon monoxide + water
  • D.  fuel  +  oxygen  carbon monoxide + hydrogen

10. Hydrocarbons are molecules containing…

  • A. carbon and hydrogen atoms
  • B. carbon and hydrogen atoms only
  • C. only single C-C and C-H bonds
  • D. at least one double C=C bond