Specify the material of construction suitable for handling concentrated HNO3 at 100°C ?
Correct answer: A. High silicon iron, Kel-F and Teflon
- A. High silicon iron, Kel-F and Teflon
- B. Tin and wood
- C. Silicone rubber
- D. Stainless steel
Explanation
Concentrated nitric acid at high temperature is strongly oxidising, so high-silicon iron and fluoropolymers such as Kel-F and Teflon are preferred for resistance. Ordinary silicone rubber and many metals are less reliable under these severe conditions.
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