Question

An example of secondary fuel is:
A. coal
B. water gas
C. neutral gas
D. petroleum

Answer 1

Hint: We know that fuel is any material which has the energy to do some work. The flue is a chemical component, and can be classified into physical properties as solids, liquid and gases; and on the basis of their occurrences as primary and secondary.

Complete step-by-step answer:
The primary fuels are also known as the naturally occurring fuels which can either be a solid, liquid or a gas. Whereas the secondary fuel, are derived artificially or processed from the primary fuel.
A fuel is named solid fuel when the natural occurrence of the fuel is solid. These include wood, coal, peat, which are primary sources and coke and charcoal which are secondary sources. The energy is consumed from these materials by heating. The identification and the use of the solid fuel led to the growth of the other branches of fuel.
Then clearly A is not the answer.
A liquid fuel is flammable and compressible. These are produced due to the fossil remains. These include petroleum which are primary sources and diesel, gasoline are a few secondary sources.
Then clearly D is not the answer.
A fuel gas is mainly log chains of hydrocarbons which produce energy. As the name suggests these are gaseous in state. This group includes natural gas which is a primary source and coal gas, water gas, CNG to name a few secondary sources.
As C is not the answer, then clearly B is the answer.

So, the correct answer is “Option B”.

Note: Fuel is classified on the basis of physical property. They can again be classified on the basis of occurrence as primary and secondary. Hence we get a total of 6 classification of the fuel, they are solid-primary, solid-secondary, liquid-primary, liquid-secondary, gas-primary, and gas-secondary.