Write any four characteristics of an ideal fuel. What is C.N.G.? Mention its one use.

Characteristics of ideal fuel are given below:

• It has a high calorific value.
• It burns easily in the air at a moderate rate.
• It has a proper ignition temperature.
• It does not produce any harmful gases or leave any residue after burning.

The full form of C.N.G is Compressed Natural Gas. It is used as a fuel for automobiles.