H2SO4 (< 50% concentration) is corrosive to_________________?
Correct answer: D. Aluminium, mild steel, stainless steel, concrete & tin
- A. Glass, graphite, porcelain & stoneware
- B. Copper, cast iron & high silicon iron (14% Si)
- C. Rubber (butyl and hard), silicone rubber & Teflon
- D. Aluminium, mild steel, stainless steel, concrete & tin
Explanation
Sulfuric acid below about 50% concentration attacks aluminium, mild steel, many stainless steels, concrete, and tin, so these materials require protection or replacement. Copper, high-silicon iron, glass, graphite, and fluoropolymer linings are generally more suitable in the listed alternatives.
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