Q1: The sewer which resists sulphide corrosion, is

ANS:D - Lead sewer

The sewer which resists sulphide corrosion is the R.C.C. (Reinforced Concrete Cement) sewer. R.C.C. sewers are often preferred in areas where sulphide corrosion is a concern due to their inherent resistance to chemical attack. Sulphide corrosion occurs when hydrogen sulphide gas (H2S), produced by the decomposition of organic matter in sewage, reacts with the material of the sewer pipe, leading to degradation and eventual failure. R.C.C. sewers have proven to be durable and resistant to the corrosive effects of hydrogen sulphide gas, making them suitable for use in sewage systems where sulphide corrosion is prevalent. Additionally, proper design and construction practices can further enhance the resistance of R.C.C. sewers to chemical attack, ensuring long-term performance and structural integrity.