Question

An example of secondary fuel is

• A. coal
• B. water gas
• C. natural gas
• D. petroleum

Answer 1

The correct option is B

water gas

1. Secondary fuels are the fuels that are derived from the fuels which are found in nature through chemical and physical processes.
2. Water gas is a mixture of carbon monoxide and hydrogen with small amounts of other gases. e.g., carbon dioxide and is almost entirely combustible.
3. Water gas is named so because of the use of water (steam) in its preparation.
4. On the other hand, coal, natural gas, and petroleum are naturally occurring primary fuels.
5. So, of the given options, water gas is an example of secondary fuel.

Hence, B) is the correct option.