Containers made of high silicon cast iron (14% Si) are not suitable for the storage of ____________________?
Correct answer: A. Hydrochloric acid (concentrated)
- A. Hydrochloric acid (concentrated)
- B. Benzoic & boric acids
- C. Phosphoric acid (95%) & sulphuric acid (95%)
- D. Acetic acid
Explanation
High-silicon cast iron resists many strong acids, including concentrated sulphuric and hydrochloric acids, but concentrated hydrochloric acid is particularly aggressive toward iron-based materials. Therefore it is unsuitable for concentrated HCl storage.
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