GK
CHEMISTRY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Endothermic
|
|
|
Exothermic
|
|
|
Either A or B
|
|
|
None of the above
|
Detailed explanation-1: -Combustion of a fuel is an exothermic reaction because energy is released during combustion.
Detailed explanation-2: -Whilst many reactions are endothermic those chemical reactions that heat us, e.g. the burning (combustion) of fuels and the combustion of petrol in a car engine are two notable exothermic reactions.
Detailed explanation-3: -Answer and Explanation: During the burning of gasoline, the temperature gets higher because it is burning, so the reaction is releasing heat into the environment, which is the exact opposite of endothermic. So burning gasoline is an exothermic reaction and not endothermic.
Detailed explanation-4: -Fire is a chemical reaction that converts a fuel and oxygen into carbon dioxide and water. It is an exothermic reaction, in other words, one that produces heat.