Cast iron vessels are not suitable for the storage of_________________?
Correct answer: D. Wet SO2
- A. Freon
- B. H2SO4 (95%) at room temperature
- C. H2SO4 (fuming)
- D. Wet SO2
Explanation
Wet sulphur dioxide is highly corrosive because dissolved moisture forms acidic sulphurous acid, which attacks cast iron. Cast iron can tolerate some concentrated sulphuric-acid service but is unsuitable for wet SO₂.
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