Most suitable material of construction for the storage of concentrated nitric acid is__________________?
Correct answer: D. Aluminium or chromium alloys (Cr > 18% for cold acid)
- A. Cast iron
- B. Monel
- C. Karbate
- D. Aluminium or chromium alloys (Cr > 18% for cold acid)
Explanation
Aluminium and chromium-rich alloys become protected by a passive oxide film in concentrated nitric acid, making them suitable storage materials. The passivation requirement is why ordinary carbon steel is not the preferred answer.
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