In a lean fuel-air mixture, which component remains present?

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Multiple Choice

In a lean fuel-air mixture, which component remains present?

Explanation:
When a mixture is lean, there is more air than what is needed to burn all the fuel. That surplus air supplies extra oxygen, and not all of it can be used by the available fuel. As a result, unreacted oxygen remains present after combustion. The nitrogen in the air is also there, but it’s largely inert and doesn’t indicate the lean condition—the defining feature is the excess oxygen. So the component that remains present due to the lean condition is oxygen.

When a mixture is lean, there is more air than what is needed to burn all the fuel. That surplus air supplies extra oxygen, and not all of it can be used by the available fuel. As a result, unreacted oxygen remains present after combustion. The nitrogen in the air is also there, but it’s largely inert and doesn’t indicate the lean condition—the defining feature is the excess oxygen. So the component that remains present due to the lean condition is oxygen.

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