M/J 2014/P11/Q19
Petroleum is separated into fractions by fractional distillation.
Which fraction distils off at the highest temperature?
A diesel
B paraffin (kerosene)
C lubricating oils
D petrol (gasoline)
Answer: C
Explaination:
Lubricating oil is the heaviest alkane fraction which collected or distils off at the lower section of the fractionating column at the highest temperature.
Hence, down the table from lightest to heaviest fraction their boiling point increases.
