IGCSE Chemistry Practice Exam 2025 – Comprehensive All-in-One Study Guide for Exam Success!

Question: 1 / 855

Which of the following is a product of incomplete combustion of alkanes?

Carbon dioxide

Oxygen

Carbon

Incomplete combustion of alkanes occurs when there is not enough oxygen available during the combustion process. In this scenario, the alkane does not fully convert to carbon dioxide and water, which are the products of complete combustion. Instead, one of the byproducts is carbon in the form of soot or other solid carbon particles. This is because the insufficient oxygen leads to the formation of solid carbon rather than fully oxidizing to CO₂.

The correct answer reflects the presence of carbon as a result of incomplete combustion. While other products like carbon dioxide and water can also be formed, they do not exclusively represent the incomplete process where carbon is evident. Understanding this difference is crucial, as it highlights the impact of oxygen availability on combustion products.

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Water

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