Question

Fuels like coal, petrol, diesel and natural gas are burnt _______ gas is released in large volumes.

Answer 1

The burning of various fuels leads to the release of the most common gases that sometimes result in global warming. Fuels are any substance that is used to generate energy to utilize for domestic and commercial purposes. Coal, petrol, diesel and natural gas has a wide range of applications from cooking to using in vehicles.

Complete answer:
Fuels are the compounds or substances obtained by nature that can burn in the presence of oxygen to provide us heat and energy. This heat and energy is often used in domestic works like cooking, and is applied in running vehicles, also the energy from fuels is used to generate gases that are sometimes useful like CNG (compressed natural gas).
The burning of these fuels happens in oxygen which is a type of combustion reaction. A combustion reaction consists of the substance reacting with oxygen. The burning of the fuels like coal, petrol, diesel, and natural gas produces carbon dioxide $\left( C{{O}_{2}} \right)$. For example, a reaction where coal (which is pure carbon) is burnt in presence of oxygen to produce carbon dioxide and heat as:
$C+{{O}_{2}}\to C{{O}_{2}}+heat$
Hence, Fuels like coal, petrol, diesel and natural gas are burnt carbon dioxide $\left( C{{O}_{2}} \right)$gas is released in large volumes.

Note:
When 1 kg of any substance is capable of being burnt then the amount of heat produced by them is called their calorific value that is measured in kJ/kg. The calorific value is the fuel. The combustion in absence or inadequate supply of oxygen produces carbon monoxide (CO) that is a poisonous gas. The increased release of carbon dioxide leads to global warming as it raises the Earth’s temperature.