Brass tarnishes in ambient air due to atmospheric trace concentrations of which gas ________ ?
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Answer: D. Hydrogen sulphide
Explanation
Trace amounts of hydrogen sulphide gas in ambient air cause brass to tarnish. A chemical reaction between copper in the brass and sulfur creates a dark patina. Over time, environmental exposure dulls the bright finish of polished brass items. Brass is a metallic alloy composed primarily of copper and zinc elements. Atmospheric pollutants can react chemically with reactive metals exposed to air. Patina formation is a natural surface oxidation or sulfidation process.
Musical instruments made of brass require regular cleaning to prevent tarnish buildup. Decorative hardware items are often lacquered to protect them from corrosive gases. Environmental monitoring tracks hydrogen sulfide levels in urban industrial areas. Carbon dioxide causes different weathering effects on other types of metal surfaces. Oxygen creates basic oxide layers but sulfur compounds drive rapid brass tarnishing. Nitrogen is an inert gas that does not react with brass under normal conditions.
- Subject
- Everyday Science
- Category
- Everyday Science
- Topic
- —
- Difficulty
- medium
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