Question

Which of the following is an eco-friendly combustible substance?
A. Diesel
B. Petrol
C. C.N.G
D. Cow dung

Answer 1

Hint : Natural gas compressed under pressure that is clean, odourless, and non-corrosive is known as compressed natural gas (CNG). It's also a less expensive, greener, and more efficient car fuel than regular gasoline and diesel.

Complete Step By Step Answer:
CNG stands for Compressed Natural Gas in its entire form. CNG is a fuel that may be used to replace diesel, gasoline, and LPG (liquefied petroleum gas). When compared to the other fuels, CNG produces fewer harmful emissions when burned. Natural gas poses less of a risk in the event of a leak than other liquids because it is lighter than air and scatters quickly once released.
Vehicles that run on compressed natural gas (CNG) are thought to be safer than those that run on gasoline. When combusted, CNG emits much less pollutants (e.g., unburned hydrocarbons (UHC), carbon monoxide $\left( {CO} \right)$ , nitrogen oxides $\left( {N{O_x}} \right)$ , sulphur oxides $\left( {S{O_x}} \right)$ , and particulate matter (PM). For example, a car that runs on petrol for 100 kilometres generates 22 kilos of $C{O_2}$ , whereas a car that runs on CNG releases just 16.3 kilogrammes of $C{O_2}$ .
So, the correct option is: (C) C.N.G.

Note :
Vehicles that run on compressed natural gas demand more fuel storage space than vehicles that run on gasoline. CNG takes up more room per GGE than gasoline since it is a compressed gas rather than a liquid (petrol gallon equivalent). The cylinders needed to store the CNG, on the other hand, take up room in the trunk of a car or the bed of a pickup truck that has been adapted to run on CNG as well.