Question

The principal source of volatile organic (hydrocarbons) is:
A. Transportation
B. Industrial processes
C. Stationary fuel combustion
D. Volcanoes

Answer 1

Hint: Hydrocarbons are those organic compounds which mainly consist of Carbon and hydrogen atoms in it. Volatile substances are those substances which evaporate easily and have low boiling point. So, in order to find the principal source of volatile organic (hydrocarbons), we would need to know about the gases or particles which are released in the sources that are mentioned above.

Complete answer:
We know that hydrocarbons are those organic compounds which mainly consist of Carbon and hydrogen atoms in it. Volatile substances are those substances which evaporate easily and have low boiling point.
Now, we will see the products of all the processes given above:
A. Transportation
In transportation fuel (hydrocarbons) is burnt and carbon dioxide, sulphur dioxide and other gases are produced. Hence, this is the incorrect option.
B. Industrial processes
In the industrial processes, when fractional distillation takes place, it produces petrol, diesel and many more compounds which consist mainly of hydrocarbons (volatile organics). This option is correct.
C. Stationary fuel combustion
In this solid, liquid or gaseous fuels are burnt in order to produce electricity. This option is incorrect.
D. Volcanoes
Volcanoes produce ash, sulphur dioxide and dust. Hence, it is an incorrect option.
Therefore, the correct option is B. Industrial processes.

Note:
We should remember that in the fractional distillation process of crude oil, we get many useful products like petrol, kerosene, liquefied natural gas and diesel. Crude oil and coal are the non-renewable sources of energy and are formed by the decomposition of the dead organic matter by microorganisms.