Vent gases combined with high moisture inside a chimney will form which acid?

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Prepare for the REHS/RS Solid and Hazardous Waste Test with comprehensive multiple choice questions, detailed hints, and in-depth explanations. Ace your environmental health exam!

Multiple Choice

Vent gases combined with high moisture inside a chimney will form which acid?

Explanation:
When vent gases contain sulfur compounds and are moist, sulfur dioxide (SO2) from the gas phase is oxidized to sulfur trioxide (SO3) and then combines with water to form sulfuric acid (H2SO4) in the chimney or on surfaces. The basic sequence is SO2 + O2 → SO3, followed by SO3 + H2O → H2SO4. This makes sulfuric acid the acid typically produced under these humid chimney conditions. While nitrogen oxides can form nitric acid under moisture, the sulfur-containing emissions dominate in this scenario, hence sulfuric acid is the best answer.

When vent gases contain sulfur compounds and are moist, sulfur dioxide (SO2) from the gas phase is oxidized to sulfur trioxide (SO3) and then combines with water to form sulfuric acid (H2SO4) in the chimney or on surfaces. The basic sequence is SO2 + O2 → SO3, followed by SO3 + H2O → H2SO4. This makes sulfuric acid the acid typically produced under these humid chimney conditions. While nitrogen oxides can form nitric acid under moisture, the sulfur-containing emissions dominate in this scenario, hence sulfuric acid is the best answer.

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