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Crown corrosion in a reinforced concrete sewer is caused by:

1. H2S
2. CO2
3. CH4
4. NH3

Correct answer: H2S

Solution

H2S, or hydrogen sulfide, is a corrosive gas that can form in sewer systems, particularly in the presence of organic matter and anaerobic conditions, leading to the deterioration of concrete through a process known as crown corrosion.

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