California Wastewater Treatment Operator Practice Exam 2025 - Free Wastewater Treatment Operator Practice Questions and Study Guide

Question: 1 / 400

Which of the following is NOT true about hydrogen sulfide?

It is a colorless gas

It has a characteristic rotten egg odor

It is toxic and flammable

It is lighter than air

Hydrogen sulfide is indeed a colorless gas that is commonly associated with a strong, unpleasant odor reminiscent of rotten eggs, making options discussing its appearance and odor accurate. Additionally, it is recognized for its toxicity and flammability, which is critical information for handling and safety.

The point regarding its density is significant because hydrogen sulfide is actually heavier than air. This means that in the presence of leaks or emissions, the gas will tend to accumulate in low-lying areas, making it essential for operators to be aware of its behavior in the environment. This knowledge helps in assessing risks and implementing safety measures accordingly. As such, the statement about hydrogen sulfide being lighter than air does not accurately reflect its physical properties.

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