O/N 2014/P11/Q14
Petroleum is a mixture of hydrocarbons which can be separated into fractions by fractional distillation. Which row shows the fractions in order of decreasing boiling point?
Answer: A
Explaination:
Boiling point decreases from heaviest (long HC alkane) to lightest fraction (small HC alkane) so, small alkane fractions having low boiling point are collected at top of fractionating column having low temperature as compare to bigger alkane fractions having high boiling point are collected at the bottom section of the column having high temperature.
So, here in the above table:
Diesel is the heaviest HC fraction then paraffin then naphtha and petrol is the lightest one fraction.
