Materials and Construction
Aqueous nitric acid is stored in

Stainless steel vessel
Cast iron vessel lined with acid-proof masonry brick
Cast iron vessel
Steel drum

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Materials and Construction
Pure nickel is

Not resistant to oxidation at high temperature
Ferromagnetic above its curie point (i.e., 415°C)
Having h.c.p. crystal lattice
Ferromagnetic at room temperature

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