Stainless steel is not corroded by _____________________?
Correct answer: B. Nitric acid (10%)
- A. Hydrochloric acid (10%)
- B. Nitric acid (10%)
- C. Sulphuric acid (10%)
- D. Saturated brine
Explanation
Stainless steel is strongly resistant to oxidising nitric acid because its chromium-rich passive film is maintained in that environment. Hydrochloric acid and hot or concentrated chloride brine can break down passivity and cause corrosion.
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