# [Gradpoint-Question AK-4] Which equation represents a combustion reaction?

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## Question:

[Gradpoint-Question AK-4] Which equation represents a combustion reaction?

A: Ca + 2H Cl —–> CaCl₂ + H₂
B: Pb(NO₃)₂ +2HCl —–> PbCl₂ + 2HNO₃
C: 2SO₂ + O₂ ——> 2SO₃
D: 2C₂H₆ + 7O₂ —–> 4CO₂ + 6H₂O
This question is worth 40 points. So please answer carefully. I’m bad at Chemical equations.

## Answer:

The equation represents a combustion reaction is –

• D: 2C₂H₆ + 7O₂ —–> 4CO₂ + 6H₂O

A reaction involves a substance reacting with oxygen and releasing energy in form of light or heat, such a chemical reaction is called a combustion reaction.

• Burning coal, methane gas, and sparklers are all common examples of combustion reactions

2C₂H₆ + 7O₂ —–> 4CO₂ + 6H₂O

• Here ethane reacts with oxygen and releases carbon dioxide and water with a high amount of energy.
• Pb(NO₃)₂ +2HCl —–> PbCl₂ + 2HNO₃ is a double replacement, acid-base reaction. It is also called a neutralization reaction.
• 2SO₂ + O₂ ——> 2SO₃ is a combination reaction that is an example of an oxidation-reduction reaction.
• Ca + 2H Cl —–> CaCl₂ + H₂ is a single replacement reaction that is also an example of oxidation-reduction reaction

Thus, the equation represents a combustion reaction is –

• D: 2C₂H₆ + 7O₂ —–> 4CO₂ + 6H₂O

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