Question

6. Burning of fuels may be an undesirable change. give scientific reason​

Answer 1

Burning of fuels is an undesirable change because;

• it releases carbon dioxide(as a part of smoke) which is a harmful green house gas.

                ⇒release of CO2 is due to the partial combustion.

• it also releases other toxic fumes such as oxides of nitrogen and sulphur, which later results in acid rain.

→In other aspects commonly used fuels require a good amount of heat     energy for combustion. Hydrogen is an combustible fuel which is still not a common fuel.