Ontario Operator-in-Training (OIT) Practice Exam

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Which of the following describes a key property of chlorine?

It is a colorless gas
It is a greenish/yellow gas with a penetrating odor
It is lighter than air
It is non-reactive with other substances

The correct answer is: It is a greenish/yellow gas with a penetrating odor

Chlorine is indeed a greenish/yellow gas that is notable for its strong and irritating odor, which can be detected at very low concentrations. This characteristic makes it easily identifiable in its gaseous form and is a key property used in various applications, such as water treatment and sanitation. The penetrating odor is significant for safety reasons, as it serves as a warning signal to individuals in the presence of chlorine, which can be harmful at higher concentrations. The other descriptions do not accurately capture the essential characteristics of chlorine. While it is true that chlorine does have a gaseous state, it is not colorless, nor is it lighter than air; chlorine is denser than air, which contributes to its behavior when released. Additionally, chlorine is highly reactive, particularly with organic compounds and other chemicals, and is far from being non-reactive. Therefore, the property of being a greenish/yellow gas with a penetrating odor stands out as the correct descriptor for chlorine.