Question 2868 Deck General

The correct answer is B) heavier than air. Hydrogen sulfide (H2S) gas is heavier than air, which means it will accumulate in low-lying areas and enclosed spaces on a MODU (Mobile Offshore Drilling Unit). This characteristic makes H2S gas particularly dangerous, as it can displace oxygen and cause asphyxiation in personnel. Knowing that H2S is heavier than air is crucial for personnel to understand, so they can take appropriate safety precautions when working in areas where H2S may be present. The other options are incorrect: A) H2S is not lighter than air, C) H2S is a colorless gas that is not easily recognized, and D) H2S is highly toxic, not mildly toxic.