Question

Which of the following is not a constituent of petroleum?
A) Paraffin wax
B) Petrol
C) Lubricating oil
D) Coke

Answer 1

Hint: The answer here is based on the basic concept of the inorganic chemistry that deals with the extraction process of the petroleum and also the fractional distillation process where the fractions or constituents of petroleum are obtained.

Complete answer:
We have come across the concept that deals with the fractional distillation process that is separation of fractions of petroleum products into its constituent parts.
We shall now refresh those concepts that will lead us to the required answer here.
- Fractional distillation is an industrial process that is basically employed for the separation of the mixture into constituents based on the temperatures that differ by less than ${{25}^{0}}C$.
- Each fraction here contains hydrocarbon molecules with similar numbers of carbon atoms and also a similar range of boiling points.
- In the fractional distillation of petroleum, the starting mixture obtained is called crude oil which also has paraffin wax in it.
- The constituent parts have gasoline, lubricating oil, petrol, diesel and also kerosene.
On the other hand, coke is the allotrope form of carbon and thus is obtained by the heating of coal in the atmosphere where there is no oxygen.
Thus, this is not the constituent of petroleum.

Therefore, the correct answer is option D) Coke.

Note:
Note that the coal and coke are the allotropes of carbon and coke is nothing but the substance formed by heating the coal in the absence of oxygen where the volatile components in coal evaporates and the remaining material is nothing but the coke.