Question

The calorific values of petrol and CNG are $45000\text{ }kJ/kg$ and $50,000\text{ }kJ/kg,$ respectively. If you have a vehicle which can run on petrol as well as CNG, which fuel will you prefer and why?

Answer 1

Hint : In order to find whether CNG is more polluting than petrol, we must first know what a CNG is. CNG is said to be the compressed natural gas. CNG is utilized in customary gas ignition motor cars that have been changed or in vehicles explicitly made for CNG use, either alone, with an isolated gas framework to broaden range (double fuel) or related to another fuel. On knowing the properties of CNG, we can easily answer the question.

Complete Step By Step Answer:
Let us first understand about CNG. The full form for CNG is known as the compressed natural gas. CNG is mainly obtained from coal wells, oil wells and methane wells. Compressed natural gas is colorless, odorless and tasteless gas. CNG has non-toxic and non-corrosive properties. CNG is usually used in automobiles as a substitute for gasoline. The primary component present in the compressed natural gas is methane.
Using this gas is very safe, as it scatters easily into the air. CNG is very cost-effective, eco-friendly, safe to use and causes no health issues. Therefore, it is very less polluting. Petrol and diesel are highly polluting as it can cause health issues like respiratory problems and it can also cause air pollution.
The calorific value of compressed natural gas is higher than petrol. So, CNG will be a good preference. It also produces more heat energy than petrol. It has less environmental pollutants and also less costly than petrol.

Note :
The tanks used to store the CNG take up space in the trunk of a car or bed of a pickup truck which has been modified to additionally run on CNG. This problem is solved in factory-built CNG vehicles that install the tanks under the body of the vehicle, leaving the trunk free which are sold in countries.