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Hydrocarbons _____. form when fuel is not completely burned are very poisonous are created mainly by factories are formed when fuel burns at high temperatures

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It’s fuel because that’s what I got on my quiz and I got it right

Answer:

Hydrocarbons form when fuel is not completely burned.

Explanation:

Hydrocarbons form when fuel is not completely burned. Unlike many of the other gases, hydrocarbons are not poisonous. However they are a major pollutant because they combine with nitrogen oxides. This combined pollutant, together with particles of smoke and soot, forms smog. Automobile engines are the major source of hydrocarbons.

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