What are three properties of H2S?

What are three properties of H2S?

• A. Heavier than air, colorless, flammable
• B. Lighter than air, colorless, flammable
• C. Heavier than air, colored, nonflammable
• D. Heavier than air, colorless, nonflammable

Answer: (A)

Hydrogen sulfide is a gas with three key properties tested here: density relative to air, appearance, and flammability. It is heavier than air, so it tends to collect in low-lying areas. It is colorless, like many simple gases, so you can’t see it. It is flammable, able to burn in air when ignited. So the description of heavier than air, colorless, and flammable matches H2S. The other options conflict with at least one of these facts: it is not lighter than air, it is not colored, and it is not nonflammable.

Hydrogen sulfide is a gas with three key properties tested here: density relative to air, appearance, and flammability. It is heavier than air, so it tends to collect in low-lying areas. It is colorless, like many simple gases, so you can’t see it. It is flammable, able to burn in air when ignited. So the description of heavier than air, colorless, and flammable matches H2S. The other options conflict with at least one of these facts: it is not lighter than air, it is not colored, and it is not nonflammable.