Multiple choice

The most dangerous pollutant for metals is

  1. SO2

  2. CO2

  3. H2S

  4. NO
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A Correct answer
Explanation

Exposure to SO2 causes deterioration of fabrics (cotton, rayon), paper and leather. Being corrosive, it has damaging effects on metals, such as iron, steel, aluminium, and on building materials, such as limestone, marble, roof slate, etc. Marble structures, limestone and geological sources of ammonia act as a sink for atmospheric SO2.

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