Question

Identify the types of chemical reaction occurring during the combustion of fuel:
a) Oxidation & Endothermic reaction b) Decomposition & Exothermic reaction c) Oxidation & Exothermic reaction d) Combination & Endothermic reaction​

Answer 1

Correct answer is Option (C) Oxidation and Exothermic reaction

Combustion of fuel is a series of  chemical reaction

Explanation:

Combustion or burning of fuel is a reaction in between the fuel and an oxidant

The Oxidant is atmospheric oxygen that produces some gaseous products that are smoke.

In combustion it is always not that fire should be there even a flame is visible which can undergo combustion

Flame is the characteristic indicator of the combustion reaction

Activation energy present with the fuel will initiate the reaction.

Combustion of fuel undergoes oxidation reaction as the reaction continues in the presence of oxygen.

It is the exothermic reaction because the double bond in O₂is much weaker than other double bonds and therefore the formation of stronger bonds in CO₂ and H₂O results in the release of energy hence it is exothermic

The Answer is Option (c) Oxidation & Exothermic reaction

Answer 2

(c) Oxidation & Exothermic reaction

This type of chemical reaction forms during the combustion of fuel.

• Combustion is a high-temperature exothermic (heat releasing) redox (oxygen adding) chemical reaction between a fuel and an oxidant.
• usually, atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke.
• Whenever we complete a combustion reaction of a hydrocarbon (compound of C and H) there are generally the same products formed: $\mathrm{CO}_{2} \text { and } \mathrm{H}_{2} \mathrm{O}$

• For example,
• The fuel you burn in your car's engine contains octane, $\mathrm{C}_{8} \mathrm{H}_{18}$
• When octane is burned, the products are$\mathrm{CO}_{2} \text { and } \mathrm{H}_{2} \mathrm{O}$.

          $2 \mathrm{C}_{8} \mathrm{H}_{18}(1)+25 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 16 \mathrm{CO}_{2}(\mathrm{~g})+18 \mathrm{H}_{2} \mathrm{O}(\mathrm{g})$

• The key ingredient to the process is the availability of oxygen.
• Combustion cannot take place in an atmosphere devoid of oxygen.

So, Oxidation & Exothermic reactions form during the combustion of fuel.