Q1- 2. Four fractions obtained from fractional distillation of crude oil are fuel oil, gasoline, kerosene and diesel.

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

The fraction which …..  
1. ... has the highest boiling point is .
2. ...contains molecules with the least number of carbon atoms is .

Q3-4 Combustion of fuels can produce carbon dioxide, carbon monoxide, sulfur dioxide and oxides of nitrogen.

3. Carbon monoxide is dangerous because it …

  • A.  causes global warming
  • B.  causes acid rain
  • C.  limits the blood from carrying oxygen
  • D.  limits the blood from carrying carbon dioxide

4. Carbon dioxide and sulfur dioxide cause the following pollution problems:

  Carbon dioxide Sulfur dioxide
A Global warming Global warming
B Global warming Acid rain
C Acid rain Global warming
D Acid rain Acid rain


Q5-10: Decane (C10H22) can be split into C3H6 and C7H16 by cracking.

5. The conditions for cracking are ….
  • A.  burn in a supply of oxygen
  • B.  heat gently with a silica catalyst
  • C.  high temperature (600-700oC) and an alumina catalyst
  • D.  high temperature (600-700oC) and a phosphoric acid catalyst

6. These compounds in order of increasing viscosity are …

  • A.   C10H22 , C3H6 , C7H16
  • B.   C10H22 , C7H16, C3H6
  • C.   C3H6 , C7H16 , C10H22
  • D.   C7H16 ,C3H6 , C10H22

7. Which of these compounds are saturated?

  • A.   C10H22 only
  • B.   C3H6 only
  • C.   C10H22  and C7H16
  • D.   all three

8. Which of these compounds instantly decolourise bromine water?

  • A.   C10H22 only
  • B.   C3H6 only
  • C.   C10H22  and C7H16
  • D.   all three
9. What is the polymer formed from C3H6?
  • A.   poly(butane)
  • B.   poly(butene)
  • C.   poly(propane)
  • D.   poly(propene)

10. These 3 molecules can all be described as ..

  • A.   alkanes
  • B.   alkenes
  • C.   unsaturated
  • D.   hydrocarbons