Arizona Driving Permit Written Practice Exam

H2S (Hydrogen Sulfide) gas is best described as:

Sweet-smelling, lighter than air, non-toxic Colorless, heavier than air, highly toxic, smells like rotten eggs Blue, lighter than air, non-flammable Odorless, heavier than air, highly toxic

Correct Answer:

Colorless, heavier than air, highly toxic, smells like rotten eggs

Explanation:

H2S is a highly toxic, colorless gas that is heavier than air and has a distinct rotten egg odor at low concentrations.

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