Question

anaerobic bacteria in soil convert the hydrogen sulfide in soil to ________
carbon dioxide
sulfur gas
ammonia
sulfate salts
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Explanation:

Anaerobic soil bacteria (e.g., sulfate-reducing bacteria) convert hydrogen sulfide ($H_2S$) or related sulfur compounds. Carbon dioxide is carbon-based, ammonia is nitrogen-based, so they are irrelevant. Sulfate salts are oxidized sulfur, but anaerobic conditions favor reduction; instead, some anaerobic bacteria produce elemental sulfur gas (S) from $H_2S$.

Answer:

sulfur gas