Question

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What is the difference between combustion and oxidation? Under what condition, an oxidation reaction can be called as combustion? Illustrate your answer with one example in each case.

[ This question consists 5 marks so please answer according to 5 marks question ]

Class - 10th
Chapter - Carbon and it's compound.

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Answer 1

Difference between combustion and oxidation :-

Combustion :

✦Burning in presence of air to give CO₂ and water is known as combustion.

✦All combustion reactions are oxidizing.

✦It involves heat.

Example :

• Burning of Wood or Coal.
• Burning of Petrol or Diesel for using vehicles like car.
• Combustion of Natural Gas or LPG to cook.

Combustion of methane :

• CH₄(g) + 2O₂ ⟶ CO₂ (g) + 2H₂O

Oxidation :

✦The addition of oxygen in a compound or addition with an element is known as oxidation.

✦The loss of electron or ion from an atom is also called as oxidation.

✦All oxidation reactions are not combustions.

✦It does not involve heat.

Example :

• The iron metal is oxidized to form the iron oxide known as rust.

        2Fe + 3O₂  forms Fe₂O₃

• Reaction between magnesium metal and oxygen to form magnesium oxide.
• CH₃CH₂OH ⟶ CH₃COOH

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An oxidation reaction can be called a combustion reaction only when they release energy in the form of heat, light.

Example:

CH₄(g) + 2O₂ ⟶ CO₂ (g) + 2H₂O + Energy

✦All hydrocarbons like alkanes, alkenes and cycloalkanes undergo combustion reactions with oxygen to give the same two products.

✦Hydrocarbon fuels burn when they react with oxygen in the air. As all hydrocarbons only contain the elements carbon and hydrogen, the only products will be oxides of these elements.

      _________________

Answer 2

QuestioN :

What is the difference between combustion and oxidation? Under what condition, an oxidation reaction can be called as combustion? Illustrate your answer with one example in each case.

ANswer :

Combustion :-

• Combustion is the complete oxidation of organic compound into carbon dioxide and water molecules in presence of oxygen gas.

• It is also defined as reaction in which there is loss of electron from an atom or ion. Combustion reactions involve heat and light.
• All combustion reactions are oxidizing since they absorb Oxygen for the reaction to take place.

Oxidation :-

• Oxidation is the addition of oxygen in a compound or addition with an element.

• Oxidation reaction does not involve heat.

• Oxidation reactions are not combustion reactions.

Oxidation reaction involves loss of electrons/addition of oxygen/removal of hydrogen.

Combustion reaction involves burning of substance in presence of oxygen and release of energy in the form of heat , light etc

1.Oxidation reaction can be called as combustion reaction  only when they release energy in the form of heat, light etc.

For example:

CH4+2O2 ------>CO2 +2H2O + Energy

2. Generally all hydrocarbons show the property of combustion oxidation reaction.