Burning fuels such as diesel and coal release sulphur dioxide. It has corrosive effects and is also suffocative in nature. Acid rain is another serious problem which damages old monuments such as the Taj Mahal.
Oxides of nitrogen and sulphur are present in smoke emitted by vehicles. These combine with water vapour present in the atmosphere to form acids which are responsible for damaging soil, crops and buildings. This is the reason why the eco-friendly fuel CNG, is now being widely used in commercial vehicles, in India. The by-product of combustion of CNG is not harmful to the environment.
An ideal fuel is one which

Options

A. does not leave behind undesirable substances
B. burns immediately on coming in contact with air
C. provides both heat and light on combustion
D. has a very high ignition temperature.

Answer

A

Explanation

An ideal fuel does not leave any undesirable product and has moderate ignition temperature.