Question

multiple-choice question

which of the following is not true about combustion?

• a fuel burns in the presence of oxygen
• the fuel is usually a hydrocarbon
• it produces oxygen
• it produces carbon dioxide and water

Explanation:

Analyze the definition of combustion

Combustion is a chemical process where a fuel reacts rapidly with oxygen gas.

Identify reactants and products

The reactants are the fuel and oxygen gas. The products are carbon dioxide and water.

Evaluate the given choices

• "a fuel burns in the presence of oxygen" is true.
• "the fuel is usually a hydrocarbon" is true.
• "it produces oxygen" is false; oxygen is consumed.
• "it produces carbon dioxide and water" is true.

Determine the incorrect statement

The statement "it produces oxygen" is NOT true because oxygen is a reactant, not a product.

Answer:

• a fuel burns in the presence of oxygen
• the fuel is usually a hydrocarbon
• it produces oxygen (Correct answer)
• it produces carbon dioxide and water